OpenAI GPT-5.5 Pro vs Sakana Fugu Ultra v2
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
- Fugu Ultra v2 is 6.0× cheaper at a typical mix of 3 input tokens per output token.
- Both accept prompts up to 1M tokens.
- Fugu Ultra v2 is the newer model (released 2026-09-11).
| GPT-5.5 Pro | Fugu Ultra v2 | |
|---|---|---|
| Vendor | OpenAI | Sakana |
| Released | 2026-04-24 | 2026-09-11 |
| Input / 1M | $30.00 | $5.00 |
| Output / 1M | $180.00 | $30.00 |
| Cached input / 1M | — | $0.50 |
| Blended / 1M (3:1) | $67.50 | $11.25 |
| Context | 1M | 1M |
| Max output | 128K | 128K |
| Accepts | text, image, file | text, image, file |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 2 | 1 |
| Cheapest provider, output | $180.00 | $30.00 |
| Best provider uptime, 24 h | 100% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | Operational | — |
Cost calculator
GPT-5.5 Pro
$4,500 per month$150 per day
Fugu Ultra v2
$750 per month$25.00 per day
Fugu Ultra v2 saves $3,750 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
Compare GPT-5.5 Pro with