GPT-5.6 Sol vs Gemini 3.8 Flash
GPT-5.6 Sol (OpenAI) and Gemini 3.8 Flash (Google) compared on price, context window, speed and independent benchmarks. GPT-5.6 Sol scores higher on the Artificial Analysis Intelligence Index (60.9 vs 58.7), while Gemini 3.8 Flash is 5.3× cheaper on a blended basis. Pick GPT-5.6 Sol for the hardest tasks and Gemini 3.8 Flash when cost dominates.
| GPT-5.6 Sol | Gemini 3.8 Flash | |
|---|---|---|
| Provider | OpenAI | |
| Input $/1M | $4.00 | $0.75 |
| Output $/1M | $20.0 | $3.75 |
| Blended $/1M (3:1) | $8.00 | $1.50 |
| Cached input $/1M | $0.40 | $0.07 |
| Context window | 1.1M | 1.0M |
| Knowledge cutoff | 2026-02 | — |
| License | proprietary | proprietary |
| Speed (tok/s) | 81 | 417 |
| Artificial Analysis Intelligence Index | 60.9 | 58.7 |
| LMArena Elo | 1455 | — |
| GPQA Diamond | 94.1% | 95.3% |
| Humanity's Last Exam | 49.5% | 47.8% |