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Sakana: Fugu Ultra vs Anthropic: Claude Fable 5: Complete Comparison 2026

Choosing between Sakana: Fugu Ultra and Anthropic: Claude Fable 5? We compare both tools across features, pricing, pros and cons to help you decide which is the better fit in 2026.

Sakana: Fugu Ultra9.2

Sakana AI · Chatbots & LLMs

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...

Anthropic: Claude Fable 59.2

Anthropic · Chatbots & LLMs

Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding. It supports text, image, and file inputs with text output, with reasoning support and...

Key differences at a glance

  • •Both start at $5.00/1M tokens (Sakana: Fugu Ultra) and $10.00/1M tokens (Anthropic: Claude Fable 5).

Side-by-side comparison

FeatureSakana: Fugu UltraSakana AIAnthropic: Claude Fable 5Anthropic
Quality score9.2 / 109.2 / 10
Starting price$5.00/1M tokens$10.00/1M tokens
Free tierNoNo
API input price$5 / 1M tokens$10 / 1M tokens
API output price$30 / 1M tokens$50 / 1M tokens
Speed——
Context window1,000,000 tokens1,000,000 tokens
CategoriesChatbots & LLMsChatbots & LLMs
Key features
  • 1,000,000-token context window
  • Vision (image input)
  • Reasoning / chain-of-thought
  • Tool / function calling
  • 1,000,000-token context window
  • Vision (image input)
  • Reasoning / chain-of-thought
  • Tool / function calling
Pros
      Cons

          Sakana: Fugu Ultra

          Choose Sakana: Fugu Ultra if you want research and writing.

          Anthropic: Claude Fable 5

          Choose Anthropic: Claude Fable 5 if you want research and writing.

          Pricing comparison

          Sakana: Fugu Ultra
          $5.00/1M tokens
          API: $5 in / $30 out per 1M tokens
          Anthropic: Claude Fable 5
          $10.00/1M tokens
          API: $10 in / $50 out per 1M tokens

          The verdict

          Overall, Sakana: Fugu Ultra edges ahead with a quality score of 9.2 versus 9.2 for Anthropic: Claude Fable 5. Choose Sakana: Fugu Ultra if you want . That said, Anthropic: Claude Fable 5 is the better pick when matters most — so the right answer depends on your priorities and budget.

          Try Sakana: Fugu Ultra →Try Anthropic: Claude Fable 5 →

          Frequently asked questions

          Q. Which is better, Sakana: Fugu Ultra or Anthropic: Claude Fable 5?

          On our scoring, Sakana: Fugu Ultra edges ahead (9.2/10), but the right pick depends on your priorities and budget — see the breakdown above.

          Q. Is Sakana: Fugu Ultra or Anthropic: Claude Fable 5 cheaper?

          Sakana: Fugu Ultra starts at $5.00/1M tokens and Anthropic: Claude Fable 5 at $10.00/1M tokens. Check current rates before committing.

          Q. Can I use Sakana: Fugu Ultra and Anthropic: Claude Fable 5 together?

          Yes — many teams use more than one AI tool, picking Sakana: Fugu Ultra for some tasks and Anthropic: Claude Fable 5 for others where it's stronger.