Your AI-powered partner for smarter, faster, and more productive software engineering

Open

February 5, 2026

Rank 2026 #169

OpenAI Codexv5.3

US OpenAI Coding

541

5.0(1)

Use tool Copy 🔗

541

5.0(1)

GPT 5 CodexCoding GPT 5.2 Codex

Your AI-powered partner for smarter, faster, and more productive software engineering

Overview

Overview Releases Alternatives Pricing Pros & Cons Prompts Reviews Q&A

Featured alternatives

Pulse Editor: Vibe Code & Automate

Overview Discussion

Overview

OpenAI Codex is a powerful AI-driven coding agent designed to accelerate and transform software development workflows. Unlike general language models, Codex is fine-tuned specifically for programming tasks, enabling it to understand natural language instructions and convert them into executable code across multiple languages and environments. Codex builds upon the lineage of models derived from GPT-3 and subsequent codex-1/agentic models that specialize in software engineering tasks, offering developers an intelligent collaborator that excels at writing, refactoring, debugging, and reviewing code.

Codex can interpret a developer’s intent and generate accurate code snippets in languages including Python, JavaScript, Go, Ruby, Swift, TypeScript, and more, while also helping users navigate complex or unfamiliar codebases. It operates both in IDEs, terminals, and cloud environments as well as through seamless integration with platforms like ChatGPT and the dedicated Codex app, which functions as a command center for coordinating multiple AI coding agents.

Beyond basic code generation, Codex supports entire software lifecycle tasks such as automated pull request generation, synthesizing tests, diagnosing performance bottlenecks, and suggesting architectural improvements. Engineers leverage these capabilities to streamline development cycles, reduce manual bottlenecks, and accelerate delivery timelines. Codex is included in higher-tier ChatGPT subscriptions (Plus, Pro, Business, Enterprise, Edu) and through standalone interfaces and CLI tools.

Releases

OpenAI Codexv5.3

OpenAI CodexInitial

Get notified when a new version of OpenAI Codex is released

Notify me

OpenAI Codex v5.3

Feb 5, 2026

Integrated GPT-5.3-Codex as the core model powering the Codex app, enhancing coding intelligence and agent capabilities across workflows.

Improved agentic software engineering support — better performance on large projects, complex tasks, refactors, and reviews (powered by Codex model evolution).

Unified sign-in and context syncing between the Codex app and ChatGPT account workflows.

Parallel agent orchestration: Run multiple Codex agents simultaneously across projects with isolated worktrees.

Skills & automations: Support for reusable skills that extend Codex beyond code generation (e.g., documentation, synthesis, workflows)

Performance improvements and bug fixes across app workflows.

Enhanced git tooling incorporated directly in the app interface.

4 0

+ Submit new release

By unverified author Claim this AI

Organization OpenAI 🇺🇸 United States

Pricing

Pricing model

Pricing

Paid options from

N/A

Use tool

Save

🔗 Copy link

🗳️ Vote Best AI Tool

Featured

Coding OpenAI Codex

US OpenAI Coding

541

5.0(1)

Overview Releases Alternatives Pricing Pros & Cons Prompts Reviews Q&A

Use tool

Save

Reviews

5.0

Average from 1 rating.

★ ★ ★ ★ ★ 1

★ ★ ★ ★ 0

★ ★ ★ 0

★ ★ 0

★ 0

Your rating

★ ★ ★ ★ ★

Post

How would you rate OpenAI Codex?

Help other people by letting them know if this AI was useful.

Prompts & Results

Title:

Description:

Prompt type:*

Prompt:*

Output type:*

Output:*

Add your own prompts and outputs to help others understand how to use this AI.

Pros and Cons

Pros

Converts natural language into working code

Supports many programming languages.

Accelerates repetitive and boilerplate coding

Generates, refactors, and reviews code

Integrates with IDEs, terminals, and cloud tools

Cons

May produce redundant or suboptimal code

Not always 100% correct — requires review

Limited to serverless environments

Can misunderstand complex intent

Limited by token context length

Q&A

What does the OpenAI Codex The 405: NOT_ALLOWED do?

OpenAI Codex The 405: NOT_ALLOWED is an AI tool that monitors and manages serverless function execution. Its role is to identify issues and crashes during the execution of serverless functions, generating unique identification codes for individual errors for easy tracking and debugging. It offers the function to check logs to further analyze the problems encountered and notifies the owner immediately when a crash or operational failure occurs.

What is the primary role of the 405: NOT_ALLOWED AI tool?

The primary role of the 405: NOT_ALLOWED AI tool is to monitor and manage the execution of serverless functions, identifying any issues and crashes that occur in the process.

Does the 405: NOT_ALLOWED handle connection defects or broader system errors?

No, the 405: NOT_ALLOWED does not handle connection defects or broader system errors. It exclusively focuses on function invocations that are occurring within the specific serverless environment it oversees.

What types of issues does the 405: NOT_ALLOWED primarily monitor?

The 405: NOT_ALLOWED primarily monitors issues and crashes that occur during the running of serverless functions within the specific serverless environment it oversees.

Does the 405: NOT_ALLOWED generate unique identification codes for individual errors?

Yes, the 405: NOT_ALLOWED does generate unique identification codes for individual errors to ease tracking and debugging.

How does the 405: NOT_ALLOWED AI tool aid in debugging?

The 405: NOT_ALLOWED aids in debugging by generating unique identification codes for individual errors, allowing easy tracking, and providing the feature to cross-check logs for further analysis of the problems encountered.

+ Show 14 more

What is the utility of the log checking function in the 405: NOT_ALLOWED?

The utility of the log checking function in the 405: NOT_ALLOWED is to provide further analysis of the problems encountered. It enhances the debugging process by offering in-depth insight into each function invocation error for potential resolutions.

How does the notification system in the 405: NOT_ALLOWED work?

The notification system in the 405: NOT_ALLOWED works by immediately notifying the owner when a crash or operational failure occurs. This serves a crucial role in timely response and recovery actions.

What solutions does the 405: NOT_ALLOWED propose when a function invocation failure occurs?

When a function invocation failure occurs, the 405: NOT_ALLOWED proposes troubleshooting solutions that are specifically designed to restore normal operation as quickly as possible.

What kind of steps does the 405: NOT_ALLOWED provide for error rectification?

The 405: NOT_ALLOWED provides detailed steps on how to rectify the error. These steps are comprehensive and user-friendly, designed to guide the owner in efficiently rectifying function invocation failures.

What is the importance of the 405: NOT_ALLOWED tool in serverless environments?

The importance of the 405: NOT_ALLOWED tool in serverless environments lies in its dedicated oversight and management of function invocations. In serverless environments where functions run independently of servers, this tool is crucial to monitor and rectify any potential errors or crashes.

Can the 405: NOT_ALLOWED also guide an end visitor of a website?

Yes, the 405: NOT_ALLOWED can guide an end visitor of a website, advising them to contact the website's owners or retry their action at a later time if a function invocation failure is encountered.

Does the 405: NOT_ALLOWED have a feature to help website visitors contact the owners?

Yes, the 405: NOT_ALLOWED has a feature that guides website visitors to contact the owners in case of a function invocation failure.

What does the FUNCTION_INVOCATION_FAILED code mean in 405: NOT_ALLOWED?

The FUNCTION_INVOCATION_FAILED code in the 405: NOT_ALLOWED denotes that there has been a failure in the invocation of a function. This code is part of the system's error identification mechanism and helps in diagnosing and rectifying the issue.

How does 405: NOT_ALLOWED help in crash management?

The 405: NOT_ALLOWED helps in crash management by specifically monitoring function invocations and immediately notifying the owner when a crash or operational failure occurs. It then provides detailed rectification steps tailored to soulve the specific issue.

What is the relevance of 405: NOT_ALLOWED in the context of website maintenance?

The relevance of 405: NOT_ALLOWED in the context of website maintenance lies in its ability to quickly identify function invocation errors and crashes, provide comprehensive debugging methods and invite the owner's attention to such issues promptly for speedy recovery and maintenance of optimal website operations.

Does the 405: NOT_ALLOWED AI tool provide real-time incident response?

Yes, the 405: NOT_ALLOWED AI tool provides real-time incident response by immediately notifying the owner of a function invocation crash or failure. It also gives comprehensive error debugging and rectification methods.

In what way does 405: NOT_ALLOWED assist in problem-solving runtime issues?

405: NOT_ALLOWED assists in problem-solving runtime issues by providing real-time monitoring and management of serverless function execution, identifying issues and crashes and offering comprehensive steps to rectify these errors promptly.

How does 405: NOT_ALLOWED aid in the field of web development and microservices?

405: NOT_ALLOWED aids in the field of web development and microservices by closely monitoring serverless function executions, which are critical in these domains. Upon detection of any failure or crash, it provides immediate notification and comprehensive troubleshooting solutions, aiding in maintaining optimal functionality and efficiency.

What role does the 405: NOT_ALLOWED AI tool play in the context of Cloud Operations and Devops?

In the context of Cloud Operations and Devops, the 405: NOT_ALLOWED AI tool plays an essential role in ensuring smooth function invocation by monitoring and managing serverless function operation, identifying and troubleshooting any issues in real-time. Its comprehensive, immediate response aids in maintaining efficient cloud operations and Devops.

Ask a question

Submit

#169

Search

OpenAI Codexv5.3

Overview

Releases

Pricing

Other tools by OpenAI

Top alternatives

Related topics

Reviews

How would you rate OpenAI Codex?

Prompts & Results

Pros and Cons

Pros

Cons

Q&A

Search

Overview

Releases

Pricing

Other tools by OpenAI

Top alternatives

Related topics

Reviews

How would you rate OpenAI Codex?

Prompts & Results

Pros and Cons

Pros

Cons

Q&A

Help

People also viewed

Feedback and Incident Report

AI Options

Create AI Tools

Mini Tool

Vibe code an AI Tool