Building more with GPT-5.1-Codex-Max
Read OriginalOpenAI has announced GPT-5.1-Codex-Max, a new model now the default in their Codex CLI coding agent. It is specifically designed for agentic coding tasks and features 'compaction,' a native training process allowing it to coherently work across millions of tokens, overcoming previous context-window limits for complex refactors and long agent loops. The article also covers its benchmark performance against competitors like Gemini 3 Pro and Claude Sonnet 4.5, and notes the broader rollout of GPT-5.1 Pro to ChatGPT users.
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