GPT‑5-Codex vs. Leanstral Comparison


GPT‑5-Codex OpenAI	Leanstral Mistral AI	+	+
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About GPT-5-Codex is a version of GPT-5 further optimized for agentic coding within Codex, focusing on real-world software engineering tasks (building full projects from scratch, adding features & tests, debugging, large-scale refactors, and code reviews). Codex now moves faster, is more reliable, and works better in real-time across your development environments, whether in terminal/CLI, IDE extension, via the web, in GitHub, or even on mobile. GPT-5-Codex is the default model for cloud tasks and code review; developers can also opt to use it locally via Codex CLI or the IDE extension. It dynamically adjusts how much “reasoning time” it spends depending on task complexity; small, well-defined tasks are fast and snappy; more complex ones (refactors, large feature work) get more sustained effort. Code review is stronger; it catches critical bugs before shipping.	About Leanstral is an open-source code agent developed by Mistral AI specifically designed to work with the Lean 4 proof assistant. The model focuses on generating code while also formally verifying its correctness against strict mathematical or software specifications. Unlike traditional coding assistants, Leanstral integrates directly with formal proof systems to ensure that generated code satisfies defined logical requirements. Its architecture is optimized for proof engineering tasks and operates efficiently with sparse model parameters. Leanstral is released under the Apache 2.0 license, making it freely accessible for developers, researchers, and organizations to use and customize. The model is designed to operate within real-world formal repositories rather than isolated problem environments. By combining code generation with formal verification, Leanstral aims to reduce the need for manual human review in complex software and mathematical development.
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 Supported Mac Supported Linux Supported Cloud Not Supported On-Premises Supported iPhone Not Supported iPad Not Supported Android Not Supported Chromebook Not Supported
Audience Developers, software engineering teams, and coding professionals wanting a tool to collaborate across environments and take on both small interactive coding tasks and large, complex projects with better code reviews	Audience AI researchers, software engineers, and developers working with formal verification, proof assistants, and mathematically rigorous software development
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 Not 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 No information available. Free Version Supported Free Trial Not Supported	Pricing Free Open source 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 openai.com/index/introducing-upgrades-to-codex/	Company Information Mistral AI Founded: 2023 France mistral.ai
Alternatives Claude Haiku 4.5 Anthropic	Alternatives GPT-5.5 OpenAI
Claude Sonnet 4.5 Anthropic	Claude Haiku 4.5 Anthropic
GPT-5.1-Codex-Max OpenAI	Claude Opus 4.6 Anthropic
GPT-5.2-Codex OpenAI	MiMo-V2.6-Pro Xiaomi Technology
GPT-5.1-Codex OpenAI View All	DeepSeek R1 DeepSeek View All
Categories Agentic AI Supported AI Coding Agents Supported AI Coding Models Supported AI Models Supported	Categories AI Coding Agents Supported AI Coding Models Supported AI Models Supported Open-Weight AI Models Supported

Integrations C++ Supported ChatGPT Supported Codex CLI Supported Codex Security Supported Cursor Supported Devin Desktop Supported GitHub Copilot Supported Go Supported HTML Supported Java Supported JavaScript Supported Mistral AI Studio Not Supported Python Supported R Supported Ruby Supported SQL Supported Scala Supported Verdent Supported Visual Basic Supported Visual Studio Code Supported Show More Integrations View All 33 Integrations	Integrations C++ Not Supported ChatGPT Not Supported Codex CLI Not Supported Codex Security Not Supported Cursor Not Supported Devin Desktop Not Supported GitHub Copilot Not Supported Go Not Supported HTML Not Supported Java Not Supported JavaScript Not Supported Mistral AI Studio Supported Python Not Supported R Not Supported Ruby Not Supported SQL Not Supported Scala Not Supported Verdent Not Supported Visual Basic Not Supported Visual Studio Code Not Supported Show More Integrations View All 3 Integrations
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