GPT 5.1 Codex Max

OpenAI has announced GPT 5.1 Codex Max, an update to their Codex coding product, “built for long-running, detailed work”.

They’re claiming a big jump on SWE-Bench Verified, past Anthropic’s Claude Sonnet 4.5, which has been the one to beat in coding performance. Looking forward to some real world usage.