Gemini 3.8 Flash vs GPT-5.6 Sol
| Benchmark | Gemini 3.8 Flash | GPT-5.6 Sol |
|---|---|---|
| MMMU-Pro (vision) | 84.2 | 81.4 |
| Chartography | 40.9 · high | 45 · max |
| GDP.pdf · AA all-pass | 22.8 | 26.2 |
| Arena Vision · overall | 1,315.4 · high | 1,280.6 · xhigh |
| Arena Document · overall | — | 1,482.7 · xhigh |
Specs
| Spec | Gemini 3.8 Flash | GPT-5.6 Sol |
|---|---|---|
| Input, per 1M | !$0.75 | $4 |
| Output, per 1M | !$3.75 | $20 |
| Cost per task? | $0.93 | $0.50 |
| Speed, tok/s | — | 85 |
| Context | 1M | 1.05M |
| Weights | Closed | Closed |
| Released | Sep 2026 | Jul 2026 |
| See images | ✓ | ✓ |
| Read PDFs | ✓ | Partial |
| Hear audio | ✓ | — |
| Watch video | ✓ | — |
| Call tools | ✓ | ✓ |
| Force a tool call | Partial | Partial |
| Return strict JSON | ✓ | ✓ |
| Search the web | ✓ | ? |
| Run code | ✓ | ? |
| Use a computer | ? | ? |
What breaks when you switch
Gemini 3.8 Flash → GPT-5.6 Sol
Nothing known.
GPT-5.6 Sol → Gemini 3.8 Flash
Context: 1.05M → 1M
Sampling parameters are ignored›
temperature, top_p and top_k are ignored now and will cause HTTP 400 in future generations; remove them from requests.
No minimal thinking level›
The minimal thinking level returns an error; avoid minimal.