GPT-5.5
openai/gpt-5.5
Creator
OpenAIReleased
2026-04-23Weights
not reportedContext
1.05M tokens ~Price in / out per Mtok
$5.00 ~ / $30.00 ~OpenRouter routed price — not the vendor's list price, fetched 2026-10-19
State
rankedHealth summary
12 of 16 scores sit on benchmarks that still discriminate. Every number here has been measured independently. 9 sit on benchmarks with a high risk of test-set contamination.
Epoch Capability Index
158.9 (156.4–161.9)
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 |
|---|---|---|---|---|---|---|
| Knowledge | ||||||
| GPQAnearing saturation | low | 90.7% | not reported | ind. | 2026-04-23 | superseded |
| Coding | ||||||
| Terminal-Benchactive | base | 84.7% | NexAU-AHE | ind. | 2026-04-23 | contaminated |
| Terminal-Benchactive | base | 83.1% | Capy | ind. | 2026-04-23 | contaminated |
| Terminal-Benchactive | base | 82.2% | Codex CLI | ind. | 2026-04-23 | contaminated |
| Terminal-Benchactive | base | 82.0% | Codex | ind. | 2026-04-23 | contaminated |
| Terminal-Benchactive | base | 66.1% | clnkr | ind. | 2026-04-23 | contaminated |
| FrontierCodeactive | base | 43.0% | codex | ind. | 2026-04-23 | clear |
| Reasoning | ||||||
| ARC-AGI-2nearing saturation | xhigh | 85.0% | not reported | ind. | 2026-04-23 | superseded |
| On benchmarks that no longer discriminateKept visible on purpose. These are often the numbers a launch announcement leads with. | ||||||
| ARC-AGIsaturated | xhigh | 95.0% | not reported | ind. | 2026-04-23 | saturatedcontaminatedsuperseded |