GPT-5.3-Codex
openai/gpt-5.3-codex
Creator
OpenAIReleased
2026-02-05Weights
not reportedContext
400k tokens ~Price in / out per Mtok
$1.75 ~ / $14.00 ~OpenRouter routed price — not the vendor's list price, fetched 2026-10-19
State
rankedHealth summary
10 of 11 scores sit on benchmarks that still discriminate. Every number here has been measured independently. 11 sit on benchmarks with a high risk of test-set contamination.
Epoch Capability Index
156.8 (152.9–160.5)
Epoch AI's Capability Index. A composite score with no benchmark health record behind it, so it is never this site's ranking basis and is always attributed. Published by Epoch AI under CC BY 4.0. fetched 2026-10-19
Scores
| Benchmark | Config | Score | Harness | Provenance | Measured | Health |
|---|---|---|---|---|---|---|
| Coding | ||||||
| Terminal-Benchactive | base | 78.4% | SageAgent | ind. | 2026-02-05 | contaminated |
| Terminal-Benchactive | base | 77.3% | Droid | ind. | 2026-02-05 | contaminated |
| Terminal-Benchactive | base | 75.8% | CodeBrain-1.5 | ind. | 2026-02-05 | contaminated |
| Terminal-Benchactive | base | 75.7% | Codelia | ind. | 2026-02-05 | contaminated |
| Terminal-Benchactive | base | 75.1% | Simple Codex | ind. | 2026-02-05 | contaminated |
| Terminal-Benchactive | base | 74.6% | Mux | ind. | 2026-02-05 | contaminated |
| Terminal-Benchactive | base | 71.5% | spoox-o-m | ind. | 2026-02-05 | contaminated |
| Terminal-Benchactive | base | 70.3% | CodeBrain-1 | ind. | 2026-02-05 | contaminated |
| Terminal-Benchactive | base | 69.1% | IndusAGI Coding Agent | ind. | 2026-02-05 | contaminated |
| Terminal-Benchactive | base | 64.7% | Terminus 2 | ind. | 2026-02-05 | contaminated |
| On benchmarks that no longer discriminateKept visible on purpose. These are often the numbers a launch announcement leads with. | ||||||
| SWE-bench Verifiedsaturated | high | 74.8% | not reported | ind. | 2026-02-05 | saturatedcontaminated |