GPT-5.6 SolvsGPT-5.5 Pro
Across 3 shared benchmarks, GPT-5.6 Sol leads overall: GPT-5.6 Sol wins 2, GPT-5.5 Pro wins 1, with 0 ties and an average score difference of +1.95.
GPT-5.6 Sol
OpenAI · 2026-06-26 · Reasoning model
GPT-5.5 Pro
OpenAI · 2026-04-23 · Reasoning model
GPT-5.6 Sol2 wins(67%)(33%)1 winGPT-5.5 Pro
Benchmark scores
Grouped by capability, sorted by largest gap within each. 3 shared benchmarks.
Math and Reasoning
GPT-5.6 Sol 2/2| Benchmark | GPT-5.6 Sol | GPT-5.5 Pro | Diff |
|---|---|---|---|
| FrontierMath Tier 4 v2 | 82.932 / 34最高（无工具） | 78.053 / 34极高强度思考（无工具） | +4.88 |
| FrontierMath v2 | 89.121 / 34最高（无工具） | 87.722 / 34极高强度思考（无工具） | +1.40 |
General Evaluation
GPT-5.5 Pro 1/1| Benchmark | GPT-5.6 Sol | GPT-5.5 Pro | Diff |
|---|---|---|---|
| GPQA Diamond | 93.5014 / 226最高（无工具） | 93.928 / 226极高强度思考（无工具） | -0.42 |
Specs
| Field | GPT-5.6 Sol | GPT-5.5 Pro |
|---|---|---|
| Publisher | OpenAI | OpenAI |
| Release date | 2026-06-26 | 2026-04-23 |
| Model type | Reasoning model | Reasoning model |
| Architecture | Dense | Dense |
| Parameters | Not available | Not available |
| Context length | 1.05M | 1000K |
| Max output | 128K | 128K |
API pricing
Prices use DataLearner records when available; missing fields are not inferred.
| Item | GPT-5.6 Sol | GPT-5.5 Pro |
|---|---|---|
| Text input | $5 / 1M tokens | $30 / 1M tokens |
| Text output | $30 / 1M tokens | $180 / 1M tokens |
| Cache read | $0.5 / 1M tokens | Not public |
| Cache write | $6.25 / 1M tokens | Not public |
Summary
- GPT-5.6 Solleads in:Math and Reasoning (2/2)
- GPT-5.5 Proleads in:General Evaluation (1/1)
On average across the 3 shared benchmarks, GPT-5.6 Sol scores 1.95 higher.
Largest single-benchmark gap: FrontierMath Tier 4 v2 — GPT-5.6 Sol 82.93 vs GPT-5.5 Pro 78.05 (+4.88).
Page generated from structured model, pricing and benchmark records. No real-time LLM is used to write the prose.