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GPT-5.1-Codex

ECI
N/A
OpenAI
Nov. 12, 2025
Closed weights

GPT-5.1-Codex is a closed-weights model from OpenAI, released November 12, 2025.

GPT-5.1-Codex vs select alternatives

DomainBenchmark
GPT-5.1-Codex
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Nov. 12, 2025
Closed weights
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Software engineering
Text Arena (Coding)Best score 1820
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ALE-BenchBest score 2951
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Terminal-Bench 2.0Best score 85%
58%
47%
27%
36%

Model metadata

General
OrganizationOpenAI
Release dateNov. 12, 2025
Model accessibilityClosed weights
CountryUnited States of America
Knowledge cutoffUnknown
Provider notesUnknown
Pricing
Input price$1.25 / 1M tokens
Output price$10 / 1M tokens
Training
ParametersUnknown
Training computeUnknown
Training hardwareUnknown
Training timeUnknown
Training dataset sizeUnknown