Building more with GPT-5.1-Codex-Max
What changed
Introducing GPT-5.1-Codex-Max, a faster, more intelligent agentic coding model for Codex. The model is designed for long-running, project-scale work with enhanced reasoning and token efficiency.
Why it matters
A concrete addition to Practical AI: Tools, Models & Frameworks: it changes what's available to builders today rather than being general commentary.
How it compares
Related prior coverage to compare against:
- Introducing Codex
- Introducing GPT-5.2-Codex
- Introducing GPT-5.3-Codex
Sources
- Building more with GPT-5.1-Codex-Max (openai-blog)primary