Hi,
If you haven’t built with the OpenAI API in a while, now is the perfect time to jump back in. We just released GPT-5.1, our fastest and most capable model yet—designed to deliver dramatically faster reasoning across all use cases.
Faster reasoning
Leveraging adaptive reasoning, GPT-5.1 adjusts its thinking time based on task complexity. It’s noticeably faster on everyday tasks while staying deep and rigorous on harder ones. And when you need maximum speed, you can set reasoning_effort='none' to get GPT-5.1-level intelligence with ultra-low latency.
Better coding performance
GPT-5.1 was trained with real developer feedback to produce cleaner, more reliable code with stronger step-by-step reasoning. It’s better at refactoring, debugging, UI generation, and quick-iteration workflows—while avoiding unnecessary overthinking on simple edits. If coding frictions pulled you away before, 5.1 is built to remove that friction.
Codex Models: We also shipped gpt-5.1-codex and gpt-5.1-codex-mini. Here’s how to think about these models:
- gpt-5.1: for everyday coding tasks
- gpt-5.1-codex: for complex, long-running agentic coding
- gpt-5.1-codex-mini: for cost-efficient edits and changes
If you stepped away from the API, this is the moment to try again. GPT-5.1 unlocks a faster, more reliable building experience.
