GPT 5.1 Codex Max

Release Date: 12/4/2025

Accuracy (Average)

34.04%

Latency (Average)

8847.51s

Avg. Cost (In/Out)

1.25 / 10

Context Window

400k

Max Output Tokens

128k

Input Modality

Hyperparameter settings
Default Provider : OpenAI

Temperature

Default

Top P

Default

Top K

Default

Max Output Tokens

128,000

Reasoning Effort

high

Benchmarks

Accuracy

Rankings

0.0%

± 2.88
21/ 29

0.0%

± 0.00
21/ 41

0.0%

± 7.00
12/ 53

0.0%

± 1.05
25/ 109
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