GPT-5.3 Codex
OpenAI · 1 configuration
Intelligence32.5
Input / 1M$1.75
Output / 1M$14.00
Context400K
Tariff: OpenAI · Source: artificial-analysis · USD per million tokens
Thinking configuration
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Compare this model’s measured thinking configurations.
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Efficient frontier: best measured score at each cost1 measured configurations · 0 without both values
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GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...
Intelligence IndexArtificial Analysis composite index, not a percentage. Different versions of the index are not directly comparable.
32.5 pointsGPQA DiamondGraduate-level scientific questions. Measures specialist reasoning rather than web-search quality.
91.5 %Humanity’s Last ExamDifficult questions across many disciplines, compared under the same evaluation setup.
42.5 %τ²-BenchTool use and interaction in assistance scenarios. Does not replace an evaluation of your integration.
86.0 %IFBenchVerifiable instruction following. A proxy for precision rather than a benchmark of creative style.
75.4 %MMMU-ProMultimodal understanding of academic problems that include images.
78.5 %Omniscience accuracyFactual accuracy in Artificial Analysis's Omniscience evaluation.
52.9 %Specifications from the catalog
Inputtext, image, file
Outputtext
Tool callingYes
Structured outputYes
Speed94.9 tok/s
First token70.75 s
Maximum output128K
Catalog listing date2026-02-24