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 with 68.6% average. 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