FrontierThe story, in brief
Introducing GPT-5.1 for developers
GPT-5.1 is live. Faster reasoning, extended caching, new developer tools—OpenAI is iterating faster than anyone expected.
The KeyNews take
Why it matters
OpenAI ships a meaningful mid-cycle update to its flagship model with production-ready features (extended prompt caching, new tools) that directly reduce developer friction and inference costs. This signals aggressive iteration velocity and suggests the model wars are moving from capability benchmarks to developer experience.
The key facts
6 to knowGPT-5.1 now available in API
Faster adaptive reasoning capability
Extended prompt caching (cost/latency optimization)
Improved coding performance
New apply_patch and shell tools for developers
Published Nov 13, 2025 — recent release
Go to the source
OpenAI Blogopenai.com
Publisher excerpt: GPT-5.1 is now available in the API, bringing faster adaptive reasoning, extended prompt caching, improved coding performance, and new apply_patch and shell tools.