GPT-5.1 Codex Max
GPT-5.1 Codex Max is behind the leaders in coding. Too few results yet to rate reasoning, agentic tasks, safety, long context, math, multimodal tasks, multilingual tasks, instruction following, or factuality.
Capability profile
Bars show the model's median result as a share of the leading model's, per capability. Select a row to see its results.
Too few results yet to rate Reasoning, Agentic, Safety, Long Context, Math, Multimodal, Multilingual, Instruction Following or Factuality.
Price
$1.25input$10.00outputper million tokens
From openai · All prices
Evidence
6results on5benchmarks
- 4 independently verified
- 2 cross-referenced
From 3 sources · latest Oct 5, 2026 · How verification works
API features
Tool callingStructured outputsReasoning
As listed by OpenRouter
GPT-5.1 Codex Max benchmark results
6 results on 5 benchmarks, grouped by capability. Each bar is the result as a share of the capability leader's; every result links to its source.
36.2% behind the leader1 of 10 ranked benchmarks measured
- 77.90Jun 15, 2026
Show 1 more coding resultHide 1 coding result
- 66.00May 1, 2026
More results
Benchmarks outside the capability baskets. They are not ranked against a leader.
- 100.00Oct 5, 2026
- 43.33Oct 5, 2026
- 71.47Oct 5, 2026
- Terminal-Bench 2.060.40Jun 15, 2026Terminal Bench 2
GPT-5.1 Codex Max: common questions
Who makes GPT-5.1 Codex Max?
GPT-5.1 Codex Max is made by OpenAI.
When was GPT-5.1 Codex Max released?
GPT-5.1 Codex Max was released on Nov 19, 2025, according to OpenAI's own announcement.
What is GPT-5.1 Codex Max good at?
GPT-5.1 Codex Max is behind the leaders in coding. Too few results yet to rate reasoning, agentic tasks, safety, long context, math, multimodal tasks, multilingual tasks, instruction following, or factuality.
How much does GPT-5.1 Codex Max cost?
GPT-5.1 Codex Max costs $1.25 per million input tokens and $10.00 per million output tokens, according to openai. At a mix of three input tokens to one output token, it costs more than 78% of the 328 priced models we track.
How many benchmarks has GPT-5.1 Codex Max been tested on?
We track 6 results for GPT-5.1 Codex Max on 5 benchmarks from 3 sources, 4 of them independently verified. The latest was recorded on Oct 5, 2026.
Which API features does GPT-5.1 Codex Max support?
OpenRouter lists tool calling, structured outputs, and reasoning for GPT-5.1 Codex Max.
About this record
Where GPT-5.1 Codex Max's numbers come from, and every name it appears under.
- Tracked since
- Apr 27, 2026
- Newest source mention
- May 27, 2026
Where the results come from
Verification: 6 scores · 4 independently verified · 2 vendor cross-reference. How these tiers are assigned
From 3 sources on 3 sites. raw.githubusercontent.com supplies 3 of them; the 4 independently verified results come from 2 sites. Bars are coloured by trust tier.
- raw.githubusercontent.com3
- huggingface.co2
- swebench.com1