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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.

$15.00

per 1M input tokens

$5.00

per 1M input tokens

Side by side

Green marks the better value in each row where a comparison is meaningful.

Anthropic: Claude Opus 4.1 compared with Sakana: Fugu Ultra v2
AttributeClaude Opus 4.1Fugu Ultra v2
ProviderAnthropicSakana
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 window200K1M
Max output32K128K
Input modalitiesimage, text, filetext, image, file
ReasoningYesYes
Tool callingYesYes
Structured outputNoYes
Prompt cachingYesYes
Open weightsNoNo
Knowledge cutoff2025-01-312026-08-28
ReleasedAugust 5, 2025September 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.