specs at a glance
| Leaderboard rank | #4 of 10 |
|---|---|
| SWE-bench Verified | 82.6% |
| SWE-bench Pro | 58.6% |
| Terminal-Bench | 82.7% (TB2.0) |
| Input price / 1M | $5 |
| Output price / 1M | $30 |
| Context window | — |
| Open weights | No |
| Access | API · ChatGPT |
| Maker | OpenAI |
how good is GPT-5.5 at coding?
GPT-5.5 sits at #4 of 10 ranked models, posting 82.6% on SWE-bench Verified — 12.4 points behind #1 Claude Fable 5. On the harder SWE-bench Pro it scores 58.6%. Terminal-Bench (agentic terminal work): 82.7% (TB2.0).
Score provenance: Verified score from vals.ai independent eval; Pro is OpenAI-reported (rivals flag possible memorization on Pro). Price: OpenAI list $5/$30 per 1M (cached input $0.50).
what does GPT-5.5 cost?
$5 per 1M input tokens and $30 per 1M output — #9 cheapest of the 10 models we track. Coding workloads are output-heavy, so weight the output rate when budgeting. Run your own volume through the AI API cost calculator for a monthly estimate.
where can you use it?
Available via API · ChatGPT. As a proprietary model, you're on the maker's infrastructure and release schedule.
head-to-head
Ranked on our AI Coding Leaderboard — scores confirmed against primary sources only, updated 2026-07-04.