SWE-1.5

SWE-1.5

Cognition
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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.

About

SWE-1.5 is the latest agent-model release by Cognition, purpose-built for software engineering and characterized by a “frontier-size” architecture comprising hundreds of billions of parameters and optimized end-to-end (model, inference engine, and agent harness) for both speed and intelligence. It achieves near-state-of-the-art coding performance and sets a new benchmark in latency, delivering inference speeds up to 950 tokens/second, roughly six times faster than its predecessor Haiku 4.5 and thirteen times faster than Sonnet 4.5. The model was trained using extensive reinforcement learning in realistic coding-agent environments with multi-turn workflows, unit tests, quality rubrics, and browser-based agentic execution; it also benefits from tightly integrated software tooling and high-throughput hardware (including thousands of GB200 NVL72 chips and a custom hypervisor infrastructure).

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

Audience

Software engineering teams and organizations looking for a tool offering an AI coding agent capable of rapid, accurate code generation, large-scale codebase navigation and real-time developer augmentation

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

$1.25 per input
Free Version
Free Trial

Pricing

No information available.
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

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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

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

Company Information

Cognition
Founded: 2023
United States
cognition.ai/blog/swe-1-5

Alternatives

Claude Opus 4.5

Claude Opus 4.5

Anthropic

Alternatives

SWE-1.6

SWE-1.6

Cognition
GLM-4.6

GLM-4.6

Zhipu AI
MiniMax M2.5

MiniMax M2.5

MiniMax
Composer 1

Composer 1

Cursor

Categories

Categories

Integrations

C
C#
ChatGPT Enterprise
Cursor
F#
GitHub
GitHub Copilot
JavaScript
Julia
Kotlin
Microsoft Foundry
OpenAI Codex
Python
R
SQL
Scala
Shiori
TypeScript
Verdent
Visual Basic

Integrations

C
C#
ChatGPT Enterprise
Cursor
F#
GitHub
GitHub Copilot
JavaScript
Julia
Kotlin
Microsoft Foundry
OpenAI Codex
Python
R
SQL
Scala
Shiori
TypeScript
Verdent
Visual Basic
Claim GPT-5.1-Codex and update features and information
Claim GPT-5.1-Codex and update features and information
Claim SWE-1.5 and update features and information
Claim SWE-1.5 and update features and information