GPT-5.1-Codex-Max

OpenAI llm

Frontier agentic coding model built for long-running, project-scale software engineering, replacing GPT-5.1-Codex as the default Codex model.

overall ⌄

56.7

27 of 93 ranked

price · $/M tokens

1.25 / 10

in / out, as of 2026-07-25

to run it yourself ⌄

API only

no weights to run

Benchmarks

What its maker published, and what anyone else measured. Every figure links the document it came from.

benchmark	published	measured
SWE-bench	77.9	—

On a 1,000-in, 1,000-out call these cost less and rank no lower — a hard comparison to argue with, and a narrow one. Value covers what it misses.