GPT-5.1-Codex vs. Mistral Medium 3.5 Comparison


GPT-5.1-Codex OpenAI	Mistral Medium 3.5 Mistral AI	+	+
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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 Mistral Medium 3.5 is a flagship 128B dense model that merges instruction-following, reasoning, and coding into a single set of weights. It has a 256K context window, configurable reasoning effort, multimodal input, strong agentic capabilities, and is built for long-horizon tasks that require reliable multi-tool use and structured outputs. The model powers remote agents in Mistral Vibe, allowing coding sessions to run in the cloud, work through long tasks independently, and execute multiple sessions in parallel. Agents can be launched from the Vibe CLI or Le Chat, with local CLI sessions moved to the cloud while preserving history, task state, and approvals. Users can inspect file diffs, tool calls, progress states, and questions as work proceeds. Each coding session runs in an isolated sandbox and can handle module refactors, test generation, dependency upgrades, CI investigations, and bug fixes, then open a GitHub pull request for review.
Platforms Supported Windows Not Supported Mac Not Supported Linux Not Supported Cloud Supported On-Premises Not Supported iPhone Not Supported iPad Not Supported Android Not Supported Chromebook Not Supported	Platforms Supported Windows Not Supported Mac Not Supported Linux Not Supported Cloud Supported On-Premises Not Supported iPhone Supported iPad Supported Android Supported Chromebook Not Supported
Audience Software engineers and engineering organizations wanting a tool to generate, refactor and maintain code at scale, integrated into their existing development toolchain	Audience Developers, engineering teams, and knowledge workers seeking to delegate coding, research, and cross-tool workflows to autonomous cloud-based AI agents
Support Phone Support Not Supported 24/7 Live Support Not Supported Online Supported	Support Phone Support Not Supported 24/7 Live Support Not Supported Online Supported
API Offers API Supported	API Offers API Not Supported
Screenshots and Videos View more images or videos	Screenshots and Videos View more images or videos
Pricing $1.25 per input Free Version Supported Free Trial Not Supported	Pricing $14.99 per month Free Version Supported Free Trial Not Supported
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 Supported Webinars Not Supported Live Online Not Supported In Person Not Supported	Training Documentation Supported Webinars Not Supported Live Online Not Supported In Person Not Supported
Company Information OpenAI Founded: 2015 United States platform.openai.com/docs/models/gpt-5.1-codex	Company Information Mistral AI Founded: 2023 France mistral.ai/news/vibe-remote-agents-mistral-medium-3-5/
Alternatives Claude Opus 4.5 Anthropic	Alternatives Mistral Vibe Mistral AI
Claude Sonnet 4.5 Anthropic	Mistral Small 4 Mistral AI
Composer 1.5 Cursor	GPT-5.1-Codex OpenAI
GPT-5.1-Codex-Max OpenAI	GLM-5.1 Z.ai
GPT‑5-Codex OpenAI View All	Mistral Large Mistral AI View All
Categories Agentic AI Supported AI Coding Agents Supported AI Coding Models Supported AI Models Supported	Categories AI Models Supported

Integrations GitHub Supported ChatGPT Supported ChatGPT Plus Supported Cursor Supported Devin Desktop Supported F# Supported GPT-5.6 Sol Ultrafast Supported Go Supported JetBrains Junie Supported Jira Not Supported Kotlin Supported Laravel Supported Microsoft Teams Not Supported OpenAI Codex Supported Ruby Supported SQL Supported Sentry Not Supported Shiori Supported Visual Basic Supported Zo Computer Supported Show More Integrations View All 46 Integrations	Integrations GitHub Supported ChatGPT Not Supported ChatGPT Plus Not Supported Cursor Not Supported Devin Desktop Not Supported F# Not Supported GPT-5.6 Sol Ultrafast Not Supported Go Not Supported JetBrains Junie Not Supported Jira Supported Kotlin Not Supported Laravel Not Supported Microsoft Teams Supported OpenAI Codex Not Supported Ruby Not Supported SQL Not Supported Sentry Supported Shiori Not Supported Visual Basic Not Supported Zo Computer Not Supported Show More Integrations View All 6 Integrations
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