Claude Fable 5 vs Sakana Namazu: Specs & Benchmark Comparison
Claude Fable 5 is developed by Anthropic, while Sakana Namazu comes from Sakana AI. Claude Fable 5 was released in June 2026, and Sakana Namazu followed 2 months later in August 2026.
We have 19 benchmark results for Claude Fable 5 and 3 benchmark results for Sakana Namazu, but they were measured on different benchmarks, so there is no like-for-like scoreboard.
Sakana Namazu is the cheaper API at $0.95 per million input tokens and $4 per million output tokens, roughly 11 times cheaper than Claude Fable 5 at $10 and $50. Claude Fable 5 takes the larger context window at 1M tokens, compared with 256K for Sakana Namazu. Both accept text and images as input. On tooling, only Claude Fable 5 supports function calling and only Claude Fable 5 offers structured output.
| Characteristic | Claude Fable 5 | Sakana Namazu |
|---|---|---|
| Company | Anthropic | Sakana AI |
| Release Date | June 9, 2026 | August 3, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 256K |
| Context (output) | 128K | 256K |
| Input Price / 1M | $10.00 | $0.95 |
| Output Price / 1M | $50.00 | $4.00 |
| Average Score | 59.8% | 92.4% |
Verdict
Sakana Namazu leads in 2 out of 4 comparison categories.
Both models show comparable average scores: Claude Fable 5 — 0.6, Sakana Namazu — 0.9.
Sakana Namazu is 12.1x cheaper: input $0.95/1M vs $10.00/1M tokens.
Claude Fable 5 supports a larger context: 1M vs 256K tokens.
Sakana Namazu is newer: released 8/3/2026 vs 6/9/2026.
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Frequently Asked Questions
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The Claude Fable 5 and Sakana Namazu comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude Fable 5 or Sakana Namazu page. See also the complete list of AI model comparisons.