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Fine-tune and deploy GPT-J and GPT-NeoX at the best cost and throughput available.

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Use a standard model or fine-tune one.
Use the standard GPT-J-6B model by EleutherAI or fine-tune on your dataset.
Fine-tune the GPT-Neo 120M, 1.3B, or 2.7B model by EleutherAI on your dataset.
Use the standard GPT-NeoX model by EleutherAI or fine-tune on your dataset.
Use the standard T5 model by Google or fine-tune on your dataset.
Blender Bot 2.0
Use the standard Blender Bot model by Facebook or fine-tune on your dataset.
Use a pre-trained model for a specific task.
Search Q&A
Answer natural language questions from any amount of text.
Blog Generator
Generate a full-length blog from a topic.
Paraphrase any amount of text.
Dialogue Summarizer
Summarize dialogue and transcripts.
Blog Outliner
Generate a blog outline from a topic.
Paragraph Generator
Generate a paragraph from a topic and bullet point.
Text Summarizer
Summarize open-ended text like articles and books.
Emotion Classifier
Classify text across 27 types of emotion.
choose your model

Use the right model for your task

Multiple models, each with different capabilities and price points. GPT-Neo 125M is the fastest model, while GPT-J is the most powerful—and more are on the way.

Use these models for classification, entity extraction, code generation, chatbots, content generation, summarization, paraphrasing, sentiment analysis, and much more.

fine-tune for free

Train your model for better performance

These models have been pre-trained on a vast amount of text from the open internet. Fine-tuning improves upon this for specific tasks by training on many more examples than can fit in a prompt, letting you achieve better results on a wide number of tasks.

Fine-tuning is as simple as preparing a dataset and uploading it to the platform.


Prepare your dataset

Prepare a text file of training examples for your task then simply upload it to the platform to start fine-tuning.


Set hyperparameters

Define how long your model should train for and how many checkpoints, or model versions, should be saved throughout training.


Evaluate performance

Set test prompts and parameters to automatically test model performance, and deploy any checkpoint to get an HTTP endpoint for inference. See docs for more information

Vanilla GPT-J
import requests

headers = {"Authorization": "Bearer <INSERT_YOUR_TOKEN>"}

data = {
   "text": "Once upon a time",
   "top_p": 1,
   "top_k": 40,
   "temperature": 0.8,
   "repetition_penalty": 1.2,
   "length": 120,
   "stop_sequences": ["bird", "cat", "dog"]

res = requests.post(
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easy-to-use APIs

Deploy any of your models in one click to get an HTTP endpoint for inference. We abstract away complexity for simple integration with all the parameters you’d expect.


Advanced optimizations

We make several low-level performance optimizations to achieve best in class response speeds.

Inference at scale

Unlock higher concurrency with an intelligent queuing system that increases throughput by 10x.

solve nlp problems

Perform a variety of natural language tasks

Choose a genre category for each movie 1. Interstellar, 2. The Departed 3. Airplane and make a list of the movie and its genre:

Lex: Let's start with an easy question about consciousness. In your view, is consciousness something that's unique to humans or is it something that permeates all matter? Almost like a fundamental force of physics?
Elon: I don't think consciousness permeates all matter.
Lex: Panpsychics believe that. There's a philosophical
Elon: How would you tell?
Lex: That's true? That's a good point.
Elon: I believe in scientific method. Don't want to blow your mind or anything, but the scientific method is if you cannot test the hypothes is, then you cannot reach meaningful conclusion that it is true.
Lex: Do you think consciousness, understanding consciousness is within the reach of science of the scientific method?
Elon: We can dramatically improve our understanding of consciousness. I'd be hard pressed to say that we understand anything with complete accuracy, but can we dramatically improve our understanding of consciousness? I believe the answer is yes.

Company Name: Netflix

Product Description: Netflix is a subscription-based streaming service that allows our members to watch TV shows and movies without commercials on an internet-connected device. You can also download TV shows and movies to your iOS, Android, or Windows 10 device and watch without an internet connection.

Blog Idea:

Extract the mailing address from this email:

Dear Jonathan,

It was great to connect at the seminar. I thought your presentation was amazing and I really appreciate offering to send a copy of the book!

My address is 4837 N Henderson Ave, Dallas, TX 75204.

Sara Davenport

Name and address:

Human: Hello, who are you?
AI: I am an AI created by Forefront. How can I help you today?
Human: I'd like to cancel my subscription.

Write a SQL query to list the names of employees with the department ID matching "1238123"

Apple announced new iPhones, iPads, and a new Apple Watch during their event on September 14, 2021. The new iPhone 13 ranges from $699 (iPhone 13 Mini 128GB) to $1599 (iPhone 13 Pro Max 1TB). The new iPads range from $329 (iPad 64GB) to $2199 (12.9-inch iPad Pro 2TB). The new Apple Watch ranges from $279 (Apple Watch SE) to $579 (Apple Watch Series 7 45mm GPS + Cellular).

Make a table summarizing the recent products from Apple's announcement:

Translate the following into German: What time is breakfast?

global scale

Infrastructure for your language models

We provide key infrastructure for language models in a simple interface so your team doesn’t have to stitch together different systems or spend months to build training and hosting infrastructure.

tokens processed per week
faster inference on any hardware
better throughput on any hardware
requests processed per week
forefront solutions

Use pre-built solutions for specific tasks

Forefront Solutions are pre-trained models for specific tasks. Each solution is distinct, optimized to solve the task at hand. Some contain multiple interconnected models, while others allow for any length of text with parsing and batching done behind the scenes.

These solutions can be deployed in one click to get an HTTP endpoint for inference. See docs for more information

A playground for all your models

Instantly experiment with any of your models without having to use an API.

Science fiction books

1. Dune by Frank Herbert (1965)
case studies

Built with Forefront’s API

Our API processes millions of tokens per day with tasks ranging from extracting data in medical records to searching internal documents with natural language questions.

The NLP problems that the models on our platform can be used to solve are countless, and it’s just the beginning. See below on how some of our customers use them to build powerful products and solutions.

We strive to provide open source models to developers as they were meant to be—with full control and access.

We help teams use state-of-the-art language models without:

1. Usage quotas
2. Content filtering
3. Approval processes

We believe in giving teams full control over their models to help them build products and solve problems how they see fit.

Frequently asked questions

What is a token?
What is a prompt and completion?
What’s the pricing for fine-tuning?
How does fine-tuning work?
What’s the pricing to inference models?
Which model should I use?
How does Search Q&A work?
What are Forefront Solutions?
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Can I self-host a model in my VPC?

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Start fine-tuning and deploying language models or explore Forefront Solutions.

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Pay per token or per hour with flat-rate hourly GPUs. No hidden fees or confusing math.

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from the blog

Guides and resources

September 23, 2021

Preparing a Dataset to Fine-tune GPT-J

Forefront Team
Forefront Team

Fine-tuning is a powerful technique to create a new GPT-J model that is specific to your use case. When done correctly, fine-tuning GPT-J can achieve performance that exceeds significantly larger, general models like OpenAI's GPT-3 Davinci.

To fine-tune GPT-J on Forefront, all you need is a set of training examples formatted in a single text file with each example generally consisting of a single input example and its associated output. Fine-tuning can solve a variety of problems, and the optimal way to format your dataset will depend on your specific use case. Below, we'll list the most common use cases for fine-tuning GPT-J, corresponding guidelines, and example text files.

Before diving into the most common use cases, there are a few best practices that should be followed regardless of the specific use case:

  • Your data must be in a single text file.
  • You should provide at least one hundred high-quality examples, ideally vetted by a human knowledgeable in the given task.
  • You should use some kind of separator at the end of each prompt + completion in your dataset to make it clear to the model where each training example begins and ends. A simple separator which works well in almost all cases is " <|endoftext|> ".
  • Ensure that the prompt + completion doesn't exceed 2048 tokens, including the separator.


Classification is the process of categorizing text into a group of words. In classification problems, each input in the prompt should be classified into one of your predefined classes.

Choose classes that map to a single token. At inference time, specify the parameter, length=1, since you only need the first token for classification.

Let's say you'd like to organize your customer support messages by topics. You may want to fine-tune GPT-J to filter incoming support so they can be routed appropriately.

The dataset might look like the following:

In the example above, we provided instructions for the model followed by the input containing the customer support message and the output to classify the message to the corresponding category. As a separator we used " <|endoftext|> " which clearly separated the different examples. The advantage of using " <|endoftext|> " as the separator is that the model natively uses it to indicate the end of a completion. It does not need to be set as a stop sequence either because the model automatically stops a completion before outputting " <|endoftext|> ".

Now we can query our model by making a Completion request.

Sentiment Analysis

Sentiment Analysis is the act of identifying and extracting opinions within a given text across blogs, reviews, social media, forums, news, etc. Let's say you'd like to get a degree to which a particular product review is positive or negative.

The dataset might look the following:

Now we can query our model by making a Completion request.


The purpose of a chatbot is to simulate human-like conversations with users via text message or chat. You could fine-tune GPT-J to imitate a specific person or respond in certain ways provided the context of a given conversation to use in a customer support situation. First, let's look at getting GPT-J to imitate Elon Musk.

The dataset might look like the following:

Here we purposefully left out separators to divide specific examples. Instead, you can opt for compiling long-form conversations when attempting to imitate a specific person since we want to capture a wide variety of responses in an open-ended format.

You could query the model by making a Completion request.

Notice that we provide "User:" and "Elon Musk:" as a stop sequence. It's important to anticipate how the model may continue to provide completions beyond the desired output and use stop sequences to stop the model from continuing. Given the pattern of the dataset where a User says something followed by Elon Musk, it makes sense to use "User:" and "Elon Musk:" as the stop sequence.

A similar but different chatbot use case would be that of a customer support bot. Here, we'll go back to providing specific examples with separators so the model can identify how to respond in different situations. Depending on your customer support needs, this use case could require a few thousand examples, as it will likely deal with different types of requests and customer issues.

The dataset might look like the following:

An optional improvement that could be made to the above dataset would be to provide more context and exchanges leading up to the resolution for each example. However, this depends on the role you're hoping to fill with your customer support chatbot.

Now we can query our model by making a Completion request.

As with the previous example, we're using "Customer:" and "#####" as stop sequences so the model stops after providing the relevant completion.

Entity Extraction

The main purpose of entity extraction is to extract information from given text to understand the subject, theme, or other pieces of information like names, places, etc. Let's say, you'd like to extract names from provided text.

The dataset might look like the following:

Now we can query our model by making a Completion request.

Idea Generation

A common use case is to use GPT-J to generate ideas provided specific information. Whether it's copy for ads or websites, blog ideas, or products, generating ideas is a useful task for GPT-J. Let's look at the aforementioned use case of generating blog ideas.

The dataset might look like the following:

Now we can query our model by making a Completion request.

Following the above example on preparing a dataset for each use case should lead to well-performing fine-tuned GPT-J models when having a sufficient amount of examples (>100MB dataset). For datasets less than 100MB, it is recommended to also provide explicit instructions with each example like the following dataset for blog idea generation.

If you need custom assistance or support with preparing a dataset for your use case, get in touch with our team.

read more
Preparing a Dataset to Fine-tune GPT-J
September 15, 2021

How You Can Use GPT-J

Forefront Team
Forefront Team

Generative Pre-trained Transformer (GPT) models, the likes of which GPT-J and GPT-3 belong to, have taken the NLP community by storm. These powerful language models excel at performing various NLP tasks like question-answering, entity extraction, categorization, and summarization without any supervised training. They require very few to no examples to understand a given task and outperform state-of-the-art models trained in a supervised fashion.

GPT-J is a 6-billion parameter transformer-based language model released by a group of AI researchers called EleutherAI in June 2021. The goal of the group since forming in July of 2020 is to open-source a family of models designed to replicate those developed by OpenAI. Their current focus is on the replication of the 175-billion parameter language model, GPT-3. But don’t let the difference in parameter size fool you. GPT-J outperforms GPT-3 in code generation tasks and, through fine-tuning, can outperform GPT-3 on a number of common natural language processing (NLP) tasks. The purpose of this article will be to outline an array of use cases that GPT-J can be applied to and excel at. For information on how to fine-tune GPT-J for any of the use cases below, check out our fine-tuning tutorial.

Use cases

Code generation

The most natural use case for GPT-J is generating code. GPT-J was trained on a dataset called the Pile, an 835GB collection of 22 smaller datasets—including academic sources (e.g., Arxiv, PubMed), communities (StackExchange, Wikipedia), code repositories (Github), and more. The addition of Github into the data has led to GPT-J outperforming GPT-3 on a variety of code generating tasks. While “vanilla” GPT-J is proficient at this task, it becomes even more capable when one fine-tunes the model on any given programming language. 

To get started fine-tuning GPT-J for code generation, check out Hugging Face’s CodeSearchNet containing 2 million comment/code pairs from open-source libraries hosted on GitHub for Go, Java, Javascript, PHP, Python, and Ruby.


GPT-J code generation input


GPT-J code generation output

Chat bot

An increasingly common NLP use case is to build a chatbot. A chatbot is software that simulates human-like conversations with users via text message or chat. With its main commercial use case to help users by providing answers to their questions, chatbots are commonly used in a variety of customer support scenarios. However, chatbots can also be used to imitate specific people like Kanye West.

Regardless of your reason for using a chatbot, it is recommended to fine-tune GPT-J by providing transcripts of the specific task. For instance, let’s say you want a custom chatbot to assist with customer support requests. A simple method to curate a fine-tuning dataset would be to record transcripts of typical customer support exchanges between your team and customers. Somewhere in the order of one hundred or so examples would be enough for GPT-J to become proficient at your company’s specific customer support tasks.

GPT-J Kanye West chatbot

Story writing

Story writing is simply a work of fiction that is written in easily understandable grammatical structure with a natural flow of speech. 

Story writing with GPT-J becomes interesting as one could fine-tune to a particular author’s writing style or book series. Imagine having a Stephen King writing bot or a bot that could help generate books 6 and 7 to Game of Thrones because, let’s be honest, George R.R. Martin is dragging his feet at this point.

Here’s an example of the begin ning to a fictitious piece written by GPT-J-6B:

Story written by GPT-J

Entity extraction

The main purpose of entity extraction is to extract information from given text to understand the subject, theme, or other pieces of information like names, places, etc. Some interesting use cases for entity extraction include:

Financial market analysis: Extract key figures from financial news articles or documents to use as signals for trading algorithms or market intelligence

Email inbox optimization: Notify users of flight times, meeting locations, and credit card charges without having to open emails

Content recommendation: Extract information from articles and media to recommend content based on entity similarity and user preferences

GPT-J shines new light on entity extraction, providing a model that is adaptive to both general text and specialized documents through few-shot learning.

GPT-J entity extraction example


Summarization is the process of summarizing information in given text for quicker consumption without losing its original meaning. GPT-J is quite proficient out-of-the-box at summarization. What follows is an example of taking a snippet of the Wikipedia article for Earth and tasking GPT-J to provide a short summary.


Article before being summarized by GPT-J


Article after being summarized by GPT-J


Not to be confused with summarization, paraphrasing is the process of rewriting a passage without changing the meaning of the original text. Where summarization attempts to condense information, paraphrasing rewords the given information. While GPT-J is capable of summarization out-of-the-box, paraphrasing with GPT-J is best achieved through fine-tuning. Here is an example of paraphrasing a shorter snippet from the same Earth Wikipedia article in the previous summarization example after training on hand-written paraphrasing examples.


Article before being paraphrased by GPT-J


Article after being paraphrased by GPT-J


A widely used commercial use case for GPT-J and other transformer-based language models is copywriting for websites, ads, and general marketing. Copywriting is a crucial marketing process to increase website, ad, and other conversion rates. Through fine-tuning GPT-J on a given company’s voice or previously successful ad campaigns, GPT-J can automatically provide effective copy at a fraction of the cost of hiring a copywriter.


Company description for GPT-J


Ad text from GPT-J


Text classification is the process of categorizing text into organized groups. Unstructured text is everywhere, such as emails, text conversations, websites, and social media, and the first step in extracting value from this data is to categorize it into organized groups. This is another use case where fine-tuning GPT-J will lead to the best performance. By providing one hundred examples or more of your given classification task, GPT-J can perform as good or better than the largest language models available like OpenAI’s GPT-3 Davinci.

GPT-J Classification

Sentiment Analysis

Sentiment analysis is the act of identifying and extracting opinions within given text like blogs, reviews, social media, forums, new, etc. Perhaps you’d like to automatically analyze thousands of reviews about your products to discover if customers are happy about your pricing plans or gauge brand sentiment on social media in real-time so you can detect disgruntled customers and immediately respond, the applications of sentiment analysis are endless and applicable to any type of business.

GPT-J Sentiment Analysis

Given the infancy of large transformer-based language models, further experimentation will inevitably lead to more use cases that these models prove to be effective at. As you may have noticed, a number of the use cases are the result of fine-tuning GPT-J. At Forefront, we believe the discovery of more use cases will not only come from increased usage of these models, but by providing a simple experience to fine-tune that allows for easy experimentation and quick feedback loops. For a tutorial on easily fine-tuning GPT-J on Forefront, check out our recent tutorial.

read more
How You Can Use GPT-J
September 7, 2021

How to Fine-Tune GPT-J

Forefront Team
Forefront Team

Recent research in Natural Language Processing (NLP) has led to the release of multiple large transformer-based language models like OpenAI’s GPT-[2,3], EleutherAI’s GPT-[Neo, J], and Google’s T5. For those not impressed by the leap of tunable parameters in the billions, the ease with which these models could perform on a never before seen task without training a single epoch is something to behold. While it has become evident that the more parameters a model has the better it will generally perform, an exception to this rule applies when one explores fine-tuning. Fine-tuning refers to the practice of further training transformer-based language models on a dataset for a specific task. This practice has led to the 6 billion parameter GPT-J outperforming the 175 billion GPT-3 Davinci on a number of specific tasks. As such, fine-tuning will continue to be the modus operandi when using language models in practice, and, consequently, fine-tuning is the main focus of this post. Specifically, how to fine-tune the open-source GPT-J-6B.

Curate a dataset

The first step in fine-tuning GPT-J is to curate a dataset for your specific task. The specific task for this tutorial will be to imitate Elon Musk. To accomplish this, we compiled podcast transcripts of Elon’s appearances on the Joe Rogan Experience and Lex Fridman Podcast into a single text file. Here’s the text file for reference. Note that the size of the file is only 150kb. When curating a dataset for fine-tuning, the main focus should be to encapsulate an evenly-distributed sample of the given task instead of prioritizing raw size of the data. In our case, these podcast appearances of Elon were great as they encompass multiple hours of him speaking on a variety of different topics.

If you plan on fine-tuning on a dataset of 100MB or greater, get in touch with our team before beginning. For more information on preparing your dataset, check out our guide.

Fine-tuning GPT-J on Forefront

Believe it or not, once you have your dataset, the hard part is done since Forefront abstracts all of the actual fine-tuning complexity away. Let’s go over the remaining steps to train your fine-tuned model.

Create deployment

Once logged in, click “New deployment”.

Create deployment

Select Fine-tuned GPT-J

From here, we’ll add a name and optional description for the deployment then select "Fine-tuned GPT-J".

Select fine-tuned GPT-J

Upload dataset

Then, we’ll upload our dataset in the form of a single text file. Again, if the dataset is 100MB or greater, get in touch with our team.

Upload dataset

Set training duration

A good rule of thumb for smaller datasets is to train 5-10 minutes every 100kb. For text files in the order of megabytes, you’ll want to train 45-60 minutes for every 10MB.

Set training duration

Set number of checkpoints

A checkpoint is a saved model version that you can deploy. You’ll want to set a number of checkpoints that evenly divides the training duration.

Set number of checkpoints

Add test prompts

Test prompts are prompts that every checkpoint will automatically provide completions for so you can compare the performance of the different models. Test prompts should be pieces of text that are not found in your training text file. This allows you to see how good the model is at understanding your topic and prevents the model from regurgitating information it has seen in your training set.

You can also customize model parameters for your specific task.

Add test prompts

Once your test prompts are set, you can press 'Fine-tune' and your fine-tuned model will begin training. You may notice the estimated completion time is longer than your specified training time. This is because it takes time to load the base weights prior to training.

View test prompts

As checkpoints being to appear, you can press 'View test prompts' to start comparing performance between your different checkpoints.

View test prompts button
View test prompts

Deploy to Playground and integrate in application

Now for the fun part: deploying your best-performing checkpoint(s) for further testing in the Playground or integration into your app.

Deploy checkpoint

To see how simple it is to use the Playground and integrate your GPT-J deployment into your app, check out our tutorial on deploying standard GPT-J.

Fine-tuning GPT-J by yourself

Using Forefront isn’t the only way to fine-tune GPT-J. For a tutorial on fine-tuning GPT-J by yourself, check out Eleuther’s guide. However, it’s important to note that not only do you save time by fine-tuning on Forefront, but it’s absolutely free—saving you $8 per hour of training. Also, when you go to deploy your fine-tuned model you save up to 33% on inference costs with increased throughput by deploying on Forefront.

Helpful Tips

  1. Prioritize quality samples of the given task over a large dataset when curating your dataset.
  2. Train 5-10 minutes per 100kb or 45-60 minutes per 10MB of your dataset.
  3. Save a number of checkpoints that evenly divides the number of minutes your training. Saving more than 10-15 checkpoints returns diminishing value and makes assessing quality difficult.
  4. Set test prompts that are not included in your dataset.
  5. You can deploy multiple checkpoints and conduct further testing in our Playground. Deployed checkpoints are pro-rated according to time deployed.
  6. For more detailed information on fine-tuning and preparing your dataset, refer to our docs.

These tips are meant as loose guidelines and experimentation is encouraged.

At Forefront, we believe building a simple experience for fine-tuning can increase experimentation with quicker feedback loops so companies and individuals can apply language models to a myriad problems. If you have any ideas on how we can further improve the fine-tuning experience, please get in touch with our team.

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How to Fine-Tune GPT-J
August 30, 2021

How to Deploy GPT-J

The Forefront Team
The Forefront Team

More than one year has passed since the public release of OpenAI's API for GPT-3. Since then, thousands of developers and hundreds of companies have started building on the platform to apply the transformer-based language model to a variety of NLP problems.

In its wake, EleutherAI, a team of AI researchers open-sourcing their work, released their first implementation of a GPT-like system, the 2.7B parameter GPT-Neo, and most recently, the 6B parameter GPT-J. Before getting into GPT-J deployments, let's understand why a company or developer would use GPT-J in the first place.

So why would one prefer to use the open-source 6B parameter GPT-J over the 175B parameter GPT-3 Davinci? The answer comes down to cost and performance.

First, let's talk about cost. With GPT-3, you pay per 1000 tokens. For the unacquainted, you can think of tokens as pieces of words, where 1000 tokens are about 750 words. So with GPT-3, your costs scale directly with usage. On the other end, the open-sourced GPT-J can be deployed to cloud infrastructure enabling you to effectively get unlimited usage while only incurring the cost of the cloud hardware hosting the model.

Now let's talk about performance. "Bigger is better" has become an adage for a reason, and transformer-based language models are no exception. While a 100B parameter transformer model will always generally outperform a 10B parameter one, the keyword is generally. Unless you're trying to solve general artificial intelligence, you probably have a specific use case in mind. This is where fine-tuning GPT-J, or specializing the model on a dataset for a specific task, can lead to better performance than GPT-3 Davinci.

Now that we've discussed why one would use GPT-J over GPT-3 to lower costs at scale and achieve better performance on specific tasks, we'll discuss how to deploy GPT-J.

How to deploy GPT-J on Forefront

For this tutorial, we'll be deploying the standard GPT-J-6B.

Create deployment

Once logged in, you can click "New deployment".

Select Vanilla GPT-J

From here, add a name and optional description for your deployment then select "Vanilla GPT-J".

Select Vanilla GPT-J

Press "Deploy"

Navigate to your newly created deployment, and press "Deploy" to deploy your Vanilla GPT-J model.

Deploy Vanilla GPT-J

Replica count

From your deployment, you can control the replica count for your deployments as usage increases to maintain fast response speeds at scale.

GPT-J Replica Count


To begin inferencing, copy the URL under the name and refer to our docs on a full set of instructions for passing requests and receiving responses.

Inferencing GPT-J

You can expect all the parameters you'd typically use with GPT-3 like response length, temperature, top P, top K, repetition penalty, and stop sequences.


You can also navigate to Playground to experiment with your new GPT-J deployment without needing to use Postman or implement any code.

Deploying GPT-J on Forefront takes only a few minutes. On top of the simplicity we bring to the deployment process, we've made several low-level machine code optimizations enabling your models to run at a fraction of the cost compared to deploying on Google's TPU v2 with no loss in throughput. If you're ready to get started deploying GPT-J, get in touch with our team.

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How to Deploy GPT-J