GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
Tested on 8 benchmarks · BenchGecko score 77.7. Top scores: LiveBench — Reasoning (82.0%), LiveBench — Mathematics (79.6%), LiveBench — Coding (71.8%).
Grok Build 0.1 scores 77.1 (99% as good) at $1.00/1M input · 20% cheaper
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)
- ReleasedNov 2025
- LicenseProprietary
- StatusActive
- Cost / Message~$0.013
Frequently Asked Questions
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Grok Build 0.1 · xAIQwen2 7B Instruct · AlibabaGPT-5.6 Terra · OpenAIphi-3-small 7.4B · MicrosoftGPT-5.4 Pro · OpenAIKey facts · as of 2026-10-05
- GPT-5.1-Codex by OpenAI. BenchGecko score 77.7, rank 22 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 · benchmarks, pricing and providers. BenchGecko, data as of 2026-10-05. https://benchgecko.ai/model/gpt-5-1-codex
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