Google Gemini 3.5 Flash vs OpenAI GPT-6.1 Sol Pro
Side by side from live data: prices, limits, who serves each model and how reliably, and how they do on our chess arena.
In short
- Gemini 3.5 Flash is 1.2× cheaper at a typical mix of 3 input tokens per output token.
- Both accept prompts up to 1M tokens.
- GPT-6.1 Sol Pro is the newer model (released 2026-09-29).
| Gemini 3.5 Flash | GPT-6.1 Sol Pro | |
|---|---|---|
| Vendor | OpenAI | |
| Released | 2026-05-19 | 2026-09-29 |
| Input / 1M | $1.50 | $2.00 |
| Output / 1M | $9.00 | $10.00 |
| Cached input / 1M | $0.15 | $0.10 |
| Blended / 1M (3:1) | $3.38 | $4.00 |
| Context | 1M | 1M |
| Max output | 66K | 128K |
| Accepts | text, image, file, audio, video | text, image, file |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 7 | 7 |
| Cheapest provider, output | $9.00 | $10.00 |
| Best provider uptime, 24 h | 100% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | Operational | Operational |
Cost calculator
Gemini 3.5 Flash
$225 per month$7.50 per day
GPT-6.1 Sol Pro
$270 per month$9.00 per day
Gemini 3.5 Flash saves $45.00 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
Compare Gemini 3.5 Flash with