Claude Sonnet 5.5 vs Sakana Namazu: Specs & Benchmark Comparison
Claude Sonnet 5.5 is developed by Anthropic, while Sakana Namazu comes from Sakana AI. Sakana Namazu was released in August 2026, and Claude Sonnet 5.5 followed a month later in September 2026.
We have 47 benchmark results for Claude Sonnet 5.5 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 2 times cheaper than Claude Sonnet 5.5 at $2 and $10. Claude Sonnet 5.5 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 Sonnet 5.5 supports function calling and only Claude Sonnet 5.5 offers structured output.
| Characteristic | Claude Sonnet 5.5 | Sakana Namazu |
|---|---|---|
| Company | Anthropic | Sakana AI |
| Release Date | September 28, 2026 | August 3, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 256K |
| Context (output) | 128K | 256K |
| Input Price / 1M | $2.00 | $0.95 |
| Output Price / 1M | $10.00 | $4.00 |
| Average Score | 67.4% | 92.4% |
Verdict
Claude Sonnet 5.5 leads in 2 out of 4 comparison categories.
Both models show comparable average scores: Claude Sonnet 5.5 — 0.7, Sakana Namazu — 0.9.
Sakana Namazu is 2.4x cheaper: input $0.95/1M vs $2.00/1M tokens.
Claude Sonnet 5.5 supports a larger context: 1M vs 256K tokens.
Claude Sonnet 5.5 is newer: released 9/28/2026 vs 8/3/2026.
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Frequently Asked Questions
Which is better for coding — Claude Sonnet 5.5 or Sakana Namazu?
Which model is cheaper — Claude Sonnet 5.5 or Sakana Namazu?
Which has a larger context window — Claude Sonnet 5.5 or Sakana Namazu?
The Claude Sonnet 5.5 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 Sonnet 5.5 or Sakana Namazu page. See also the complete list of AI model comparisons.