GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic...
Tested on 8 benchmarks · BenchGecko score 85.6. Top scores: LiveBench — Reasoning (84.6%), LiveBench — Mathematics (83.7%), LiveBench — Coding (81.4%).
Regularly refreshed coding problems that avoid data contamination. New problems added monthly to prevent memorization.
LiveBench coding tasks that require multi-step reasoning and tool use. Tests planning and execution of complex coding workflows.
Regularly refreshed reasoning problems testing logical deduction, spatial reasoning, and analytical thinking.
Fresh data analysis tasks testing ability to interpret tables, charts, and statistical data.
Regularly updated math problems that test numerical reasoning, algebra, calculus, and combinatorics.
- Typemultimodal
- Context400K tokens (~200 books)
- ReleasedDec 2025
- LicenseProprietary
- StatusActive
- Cost / Message~$0.013
Frequently Asked Questions
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- GPT-5.1-Codex-Max by OpenAI. BenchGecko score 85.6, rank 13 of 312 scored models (normalized average of public benchmark scores).
- List price $1.25 input · $10.00 output per 1M tokens (as of 2026-10-05).
- Sold by 1 provider (as of 2026-10-05): Azure $1.25 in / $10.00 out.
How to cite · data as of 2026-10-05
GPT-5.1-Codex-Max · benchmarks, pricing and providers. BenchGecko, data as of 2026-10-05. https://benchgecko.ai/model/gpt-5-1-codex-max
Credit "Source: BenchGecko" with a link. Prices per provider and Gecko Tests are BenchGecko data (CC BY 4.0); benchmark scores keep their original source, listed in the JSON. JSON · llms.txt · MCP