Claude Opus 4.1 is an updated version of Anthropic’s flagship model, offering improved performance in coding, reasoning, and agentic tasks. It achieves 74.5% on SWE-bench Verified and shows notable gains...
Model details →Anthropic: Claude Opus 4.1 vs Sakana: Fugu Ultra
Sakana: Fugu Ultra wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
Fugu Ultra is the higher-performance model in Sakana AI's Fugu family. Rather than a single monolithic model, Fugu is a learned multi-agent orchestration system: a language model trained to route...
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Opus 4.1 | Sakana: Fugu Ultra | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 200K | 1M | 🏆 Sakana: Fugu Ultra |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $15.00 | $5.00 | 🏆 Sakana: Fugu Ultra |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $75.00 | $30.00 | 🏆 Sakana: Fugu Ultra |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | Yes | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is Anthropic: Claude Opus 4.1 better than Sakana: Fugu Ultra?
Sakana: Fugu Ultra wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Anthropic: Claude Opus 4.1 and Sakana: Fugu Ultra?
Input: $15.00 vs $5.00 per 1M tokens. Output: $75.00 vs $30.00 per 1M tokens.
What context windows do Anthropic: Claude Opus 4.1 and Sakana: Fugu Ultra support?
Anthropic: Claude Opus 4.1 supports up to 200K tokens. Sakana: Fugu Ultra supports up to 1M tokens.
Do both Anthropic: Claude Opus 4.1 and Sakana: Fugu Ultra support tool calling?
Anthropic: Claude Opus 4.1: yes. Sakana: Fugu Ultra: yes.
Compare Anthropic: Claude Opus 4.1 with other models
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