Model record

GPT-5.3-Codex

xhigh

OpenAI · released Feb 5, 2026

Overall standing

Overall
57.5rank 9 of 63
57.5 is at approximately the 87th percentile of the ranked Overall field. The field spans 19.0 to 62.2, with a median of 49.4.
6 of 8 measured · 2 estimated
Category standingsReasoning 70.2Coding 66.9Math 16.9Agentic 28.3
Reasoning
70.2rank 8 of 63
70.2 is at approximately the 88th percentile of the ranked Reasoning field. The field spans 31.6 to 73.3, with a median of 65.0.
4 of 4 measured
Coding
66.9rank 14 of 63
66.9 is at approximately the 79th percentile of the ranked Coding field. The field spans 10.4 to 72.4, with a median of 54.5.
1 of 2 measured · 1 estimated
Math
16.9rank 12 of 63
16.9 is at approximately the 81th percentile of the ranked Math field. The field spans 0.0 to 32.3, with a median of 5.7.
1 of 1 measured
Agentic
28.3rank 11 of 63
28.3 is at approximately the 83th percentile of the ranked Agentic field. The field spans 3.3 to 33.4, with a median of 19.0.
0 of 1 measured · 1 estimated
Model factsProprietary · $1.8 / $14.0 per 1M

Model facts come from the provider page. Listed API prices carry a separate first-party source and check date.

Provider
OpenAI
Released
Weights
Proprietary
Context window
400,000 tokens
Input price / Mtok
$1.8
Output price / Mtok
$14.0
Price source
Official pricing (opens in a new tab)
Reasoning effort
xhigh effort

Scores and sources

Measured scores retain their source and retrieval date. Missing scores are not treated as zero.

Benchmark scores, evaluation settings, sources, and retrieval dates for GPT-5.3-Codex
BenchmarkCategoryScoreEvaluation settingsSource
Terminal-Bench v2.1Coding—Not measured in this datasetNo source
τ³-BankingAgentic—Not measured in this datasetNo source
AA-LCRReasoning74.0Artificial Analysis independent run; 100 roughly 100k-token multi-document questions; 3 repeats; equality-checker pass@1; no toolsOpen source (opens in a new tab)
Humanity's Last ExamReasoning39.9Artificial Analysis independent run; 2,158 text-only questions; pass@1; GPT-4o (August 2024) equality checker; no toolsOpen source (opens in a new tab)
GPQA DiamondReasoning91.5Artificial Analysis independent run; 198 questions; 5 repeats; regex-graded pass@1; no toolsOpen source (opens in a new tab)
SciCodeCoding53.2Artificial Analysis independent run; 288 test subproblems; scientist background included; 3 repeats; subproblem pass@1Open source (opens in a new tab)
IFBenchReasoning75.4Artificial Analysis independent run; 294 single-turn prompts; 5 repeats; official loose evaluator; prompt-level pass@1Open source (opens in a new tab)
CritPtMath16.9Artificial Analysis independent run; 70 test challenges; 5 repeats; two-step answer parsing; official CritPt grader; pass@1; no toolsOpen source (opens in a new tab)