GPT-5.1-Codex-Max — reviews, specs & pricing

Agentic coding model tuned for multi-hour software engineering sessions with context compaction.

Summary

OpenAI's frontier agentic coding model, built on an updated reasoning core and the first trained to work coherently across multiple context windows through compaction. It targets long-running software engineering inside Codex.

Sample use case

Autonomous coding agents and long-horizon software engineering work.

Specifications

  • Provider: openai
  • License: closed
  • Released: 2025-11-19

Average rating 0.0 from 0 community reviews on Reviuws.

Frequently asked questions

What is GPT-5.1-Codex-Max?

OpenAI's frontier agentic coding model, built on an updated reasoning core and the first trained to work coherently across multiple context windows through compaction. It targets long-running software engineering inside Codex.

How much does GPT-5.1-Codex-Max cost?

Pricing for GPT-5.1-Codex-Max is not publicly listed.

Is GPT-5.1-Codex-Max open source?

GPT-5.1-Codex-Max is released under the closed license.