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About

Composer 1.5 is the latest agentic coding model from Cursor that balances speed and intelligence for everyday code tasks by scaling reinforcement learning approximately 20x more than its predecessor, enabling stronger performance on real-world programming challenges. It’s designed as a “thinking model” that generates internal reasoning tokens to analyze a user’s codebase and plan next steps, responding quickly to simple problems and engaging deeper reasoning on complex ones, while remaining interactive and fast for daily development workflows. To handle long-running tasks, Composer 1.5 introduces self-summarization, allowing the model to compress and carry forward context when it reaches context limits, which helps maintain accuracy across varying input lengths. Internal benchmarks show it surpasses Composer 1 in coding tasks, especially on more difficult issues, making it more capable for interactive use within Cursor’s environment.

About

GPT-5.1-Codex is a specialized version of the GPT-5.1 model built for software engineering and agentic coding workflows. It is optimized for both interactive development sessions and long-horizon, autonomous execution of complex engineering tasks, such as building projects from scratch, developing features, debugging, performing large-scale refactoring, and code review. It supports tool-use, integrates naturally with developer environments, and adapts reasoning effort dynamically, moving quickly on simple tasks while spending more time on deep ones. The model is described as producing cleaner and higher-quality code outputs compared to general models, with closer adherence to developer instructions and fewer hallucinations. GPT-5.1-Codex is available via the Responses API route (rather than a standard chat API) and comes in variants including “mini” for cost-sensitive usage and “max” for the highest capability.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

Software developers and engineers requiring an AI coding assistant that delivers smart, interactive code generation and reasoning support within their coding workflows

Audience

Software engineers and engineering organizations wanting a tool to generate, refactor and maintain code at scale, integrated into their existing development toolchain

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

Pricing

No information available.
Free Version
Free Trial

Pricing

$1.25 per input
Free Version
Free Trial

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

Cursor
Founded: 2023
United States
cursor.com/blog/composer-1-5

Company Information

OpenAI
Founded: 2015
United States
platform.openai.com/docs/models/gpt-5.1-codex

Alternatives

Composer 2

Composer 2

Cursor

Alternatives

Claude Opus 4.5

Claude Opus 4.5

Anthropic
Composer 1

Composer 1

Cursor
DeepSeek-V2

DeepSeek-V2

DeepSeek

Categories

Categories

Integrations

Cursor
C#
C++
ChatGPT
ChatGPT Enterprise
ChatGPT Plus
ChatGPT Pro
GitHub Copilot
Go
Java
Julia
Kotlin
Microsoft Foundry
PHP
Python
Scala
TypeScript
Visual Basic
Windsurf Editor
Zo Computer

Integrations

Cursor
C#
C++
ChatGPT
ChatGPT Enterprise
ChatGPT Plus
ChatGPT Pro
GitHub Copilot
Go
Java
Julia
Kotlin
Microsoft Foundry
PHP
Python
Scala
TypeScript
Visual Basic
Windsurf Editor
Zo Computer
Claim Composer 1.5 and update features and information
Claim Composer 1.5 and update features and information
Claim GPT-5.1-Codex and update features and information
Claim GPT-5.1-Codex and update features and information