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GPT 5.1 Codex

openai/gpt-5.1-codex
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GPT 5.1 Codex

openai/gpt-5.1-codex

Coding-focused GPT-5.1 variant with optimized routing.

Added Nov 13, 2025

Context Window

400.0K

Max Output

128.0K

Input Price (Auto)

$1.25/1M

Output Price (Auto)

$10.00/1M

Cache Read (Auto)

$0.13/1M

Capabilities

Benchmarks

Performance metrics and benchmarks

Sourced from Artificial Analysis.

Intelligence Index

35.6

Better than 78% of models compared

Reasoning

GPQA Diamond

Graduate-level scientific reasoning

86.0%

Better than 84% of models compared

HLE

Humanity's Last Exam

25.7%

Better than 81% of models compared

IFBench

Instruction-following benchmark

70.0%

Better than 84% of models compared

T²-Bench Telecom

Conversational AI agents in dual-control scenarios

83.0%

Better than 73% of models compared

AA-LCR

Long context reasoning evaluation

69.0%

Better than 77% of models compared

CritPt

Research-level physics reasoning

5.7%

Coding

SciCode

Python programming for scientific computing

40.2%

Better than 71% of models compared

Terminal-Bench Hard

Agentic coding and terminal use

34.8%

Better than 80% of models compared

LiveCodeBench

Contamination-free coding benchmark

84.9%

Better than 96% of models compared

Math

AIME 2025

American Invitational Mathematics Examination 2025

95.7%

Better than 97% of models compared

Knowledge

MMLU-Pro

Professional and academic subject knowledge

86.0%

Better than 94% of models compared

AA-Omniscience Accuracy

Proportion of correctly answered questions

39.9%

AA-Omniscience Hallucination Rate

Rate of incorrect answers among non-correct responses

77.2%

Last updated Aug 16, 2026

Artificial Analysis

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