Claude Opus 4.1 vs Fugu Ultra v2
Fugu Ultra v2 is 2.7× cheaper than Claude Opus 4.1 on a blended basis. Fugu Ultra v2 has the larger context window at 1M tokens.
Side by side
Green marks the better value in each row where a comparison is meaningful.
| Attribute | Claude Opus 4.1 | Fugu Ultra v2 |
|---|---|---|
| Provider | Anthropic | Sakana |
| Input / 1M tokens | $15.00 | $5.00 |
| Output / 1M tokens | $75.00 | $30.00 |
| Blended / 1M tokens | $30.00 | $11.25 |
| Cached input / 1M | $1.50 | $0.500 |
| Context window | 200K | 1M |
| Max output | 32K | 128K |
| Input modalities | image, text, file | text, image, file |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Structured output | No | Yes |
| Prompt caching | Yes | Yes |
| Open weights | No | No |
| Knowledge cutoff | 2025-01-31 | 2026-08-28 |
| Released | August 5, 2025 | September 11, 2026 |
Frequently asked
Is Claude Opus 4.1 or Fugu Ultra v2 cheaper?
Fugu Ultra v2 is 2.7× cheaper than Claude Opus 4.1 on a blended basis.
What is the price difference between Claude Opus 4.1 and Fugu Ultra v2?
Claude Opus 4.1 costs $15.00 per million input tokens and $75.00 per million output tokens. Fugu Ultra v2 costs $5.00 and $30.00 respectively.
Which has the larger context window, Claude Opus 4.1 or Fugu Ultra v2?
Fugu Ultra v2, at 1M tokens versus 200K.