GPT-5.1-CODEX
OpenAI's GPT-5.1-CODEX is a chat model capable of various tasks, including code completion, generation, and review, as well as reasoning and tool use. It excels in coding and mathematical tasks, as evidenced by its high scores in the Coding Index, Math Index, and LiveCodeBench benchmarks, which all fall within the top 10% or top 25% of models.
Input
Output
Context
272K
Max Output
128K
Parameters
-
Technical Specifications
Model TypeCode
Context Window272,000 tokens
Max Output Tokens128,000 tokens
ParametersNot available
Release DateNov 12, 2025
Training CutoffSep 30, 2024
Licenseproprietary
Open SourceNo
Input Modalities
ImageText
Output Modalities
Text
Capabilities
Benchmarks
Artificial Analysis
23.4%
HLE
67.3%
AA-LCR
86.0%
GPQA
83.0%
Tau2-Bench
95.7%
AIME 2025
70.0%
IFBench
40.2%
SciCode
86.0%
MMLU Pro
95.7
Math
84.9%
LiveCodeBench
34.7
Intelligence
34.8%
Terminal-Bench Hard
Resources & Links
proprietary, Proprietary - API access only
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Data sourced from official provider APIs and documentation
Last updated: Aug 8, 2026
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