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GPT 5.1 Codex

GPT 5.1 Codex is a model from OpenAI, released November 13, 2025.

Release Date: Nov 13, 2025

Developer OpenAI  🇺🇸
Context Window 400k
Max Output Tokens 128k
Token Costs (in/out) $1.25/10.00
Weights Private
Input Modalities

Accuracy

49.33 %

Avg. Cost (In/Out)

$ 1.25 / $ 10.00

Latency

27 min 10 s

Vals Index
BenchmarksAccuracyRankings
Vibe Code Bench v1.1

13.12%

±3.16
89/110
LiveCodeBench

85.55%

±1.00
31/143
Proprietary BenchmarksAcademic BenchmarksIndustry Partners
Vals
Default Provider : OpenAI
Temperature: Default
Top P: Default
Top K: Default
Max Output Tokens: 128,000
Reasoning Effort: high