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What is GPT-5.1-Codex?

GPT-5.1-Codex represents a sophisticated evolution of the GPT-5.1 framework, tailored specifically for coding and software development tasks that necessitate a degree of independence. This model shines in interactive programming scenarios as well as in the sustained execution of complex engineering endeavors, encompassing activities such as building applications from scratch, improving functionalities, debugging, performing comprehensive code refactoring, and conducting code reviews. It adeptly harnesses a variety of tools while merging seamlessly into development environments, modulating its reasoning skills according to the complexity of the tasks at hand; it swiftly resolves straightforward issues while allocating additional resources to more complex challenges. Users have noted that GPT-5.1-Codex consistently produces cleaner and higher-quality code compared to its general-purpose alternatives, demonstrating a better alignment with developer needs and a significant decrease in errors. Moreover, access to the model is provided via the Responses API rather than the typical chat API, and it includes distinct configurations such as a “mini” version for those on a budget and a “max” variant that offers the highest level of performance. This specialized iteration is designed not only to improve productivity but also to significantly enhance efficiency in software development processes, ultimately leading to a smoother workflow for engineers. Its adaptability and targeted features make it a valuable asset in the fast-evolving landscape of software engineering.

What is CodeGen?

CodeGen is an innovative open-source framework aimed at producing code via program synthesis, employing TPU-v4 in its training process. It distinguishes itself as a formidable competitor to OpenAI Codex in the field of code generation tools, showcasing its potential to enhance developer productivity and streamline coding tasks.

Media

Media

Integrations Supported

Python
C#
ChatGPT
ChatGPT Enterprise
Codex CLI
Codex Security
F#
FauxPilot
GPT-5.6
GitHub Copilot
HTML
JavaScript
JetBrains Junie
Laravel
PHP
Ruby
SQL
Shiori
Visual Basic
Zo Computer

Integrations Supported

Python
C#
ChatGPT
ChatGPT Enterprise
Codex CLI
Codex Security
F#
FauxPilot
GPT-5.6
GitHub Copilot
HTML
JavaScript
JetBrains Junie
Laravel
PHP
Ruby
SQL
Shiori
Visual Basic
Zo Computer

API Availability

Has API

API Availability

Has API

Pricing Information

$1.25 per input
Free Trial Offered?
Free Version

Pricing Information

Free
Free Trial Offered?
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

OpenAI

Date Founded

2015

Company Location

United States

Company Website

platform.openai.com/docs/models/gpt-5.1-codex

Company Facts

Organization Name

Salesforce

Date Founded

1999

Company Location

United States

Company Website

github.com/salesforce/CodeGen

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