Announcing GPT-5.1-codex-max: The Future of Enterprise Coding Starts Now

We’re thrilled to announce the general availability of OpenAI's GPT-5.1-codex-max in Microsoft Foundry Models; a leap forward that redefines what’s possible for enterprise-grade coding agents. This isn’t just another model release; it’s a celebration of innovation, partnership, and the relentless pursuit of developer empowerment.

At Microsoft Ignite, we unveiled Microsoft Foundry: a unified platform where businesses can confidently choose the right model for every job, backed by enterprise-grade reliability. Foundry brings together the best from OpenAI, Anthropic, xAI, Black Forest Labs, Cohere, Meta, Mistral, and Microsoft’s own breakthroughs, all under one roof. Our partnership with Anthropic is a testament to our commitment to giving developers access to the most advanced, safe, and high-performing models in the industry. And now, with GPT-5.1-codex-max joining the Foundry family, the possibilities for intelligent applications and agentic workflows have never been greater. GPT 5.1-codex-max is available today in Microsoft Foundry and accessible in Visual Studio Code via the Foundry extension .

Meet GPT-5.1-codex-max: Enterprise-Grade Coding Agent for Complex Projects

GPT-5.1-codex-max is engineered for those who build the future. Imagine tackling complex, long-running projects without losing context or momentum. GPT-5.1-codex-max delivers efficiency at scale, cross-platform readiness, and proven performance with top scores on SWE-Bench (77.9), the gold standard for AI coding. With GPT-5.1-codex-max, developers can focus on creativity and problem-solving, while the model handles the heavy lifting.

GPT-5.1-codex-max isn’t just powerful; it’s practical, designed to solve real challenges for enterprise developers:

• Multi-Agent Coding Workflows: Automate repetitive tasks across microservices, maintaining shared context for seamless collaboration.
• Enterprise App Modernization: Effortlessly refactor legacy .NET and Java applications into cloud-native architectures.
• Secure API Development: Generate and validate secure API endpoints, with `compliance checks built-in for peace of mind.
• Continuous Integration Support: Integrate GPT-5.1-codex-max into CI/CD pipelines for automated code reviews and test generation, accelerating delivery cycles.

These use cases are just the beginning. GPT-5.1-codex-max is your partner in building robust, scalable, and secure solutions.

Foundry: Platform Built for Developers Who Build the Future

Foundry is more than a model catalog—it’s an enterprise AI platform designed for developers who need choice, reliability, and speed.

• Choice Without Compromise: Access the widest range of models, including frontier models from leading model providers.
• Enterprise-Grade Infrastructure: Built-in security, observability, and governance for responsible AI at scale.
• Integrated Developer Experience: From GitHub to Visual Studio Code, Foundry connects with tools developers love for a frictionless build-to-deploy journey.

Start Building Smarter with GPT-5.1-codex-max in Foundry

The future is here, and it’s yours to shape. Supercharge your coding workflows with GPT-5.1-codex-max  in Microsoft Foundry today.

Learn more about Microsoft Foundry: aka.ms/IgniteFoundryModels.
Watch Ignite sessions for deep dives and demos: ignite.microsoft.com.

Build faster, smarter, and with confidence on the platform redefining enterprise AI.