OpenAI GPT-6 Astra 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 1.8× cheaper at a typical mix of 3 input tokens per output token.
- Both accept prompts up to 1M tokens.
| GPT-6 Astra | Fugu Ultra v2 | |
|---|---|---|
| Vendor | OpenAI | Sakana |
| Released | 2026-09-04 | 2026-09-11 |
| Input / 1M | $10.00 | $5.00 |
| Output / 1M | $50.00 | $30.00 |
| Cached input / 1M | $1.00 | $0.50 |
| Blended / 1M (3:1) | $20.00 | $11.25 |
| Context | 1M | 1M |
| Max output | 128K | 128K |
| Accepts | text, image, file | text, image, file |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 7 | 1 |
| Cheapest provider, output | $50.00 | $30.00 |
| Best provider uptime, 24 h | 100% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | Operational | — |
Cost calculator
GPT-6 Astra
$1,350 per month$45.00 per day
Fugu Ultra v2
$750 per month$25.00 per day
Fugu Ultra v2 saves $600 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
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