Claude Opus 5.5 vs Sakana Namazu: Specs & Benchmark Comparison
Claude Opus 5.5 is developed by Anthropic, while Sakana Namazu comes from Sakana AI. Sakana Namazu was released in August 2026, and Claude Opus 5.5 followed a month later in September 2026.
We have 31 benchmark results for Claude Opus 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 4 times cheaper than Claude Opus 5.5 at $4 and $20. Claude Opus 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 Opus 5.5 supports function calling and only Claude Opus 5.5 offers structured output.
| Characteristic | Claude Opus 5.5 | Sakana Namazu |
|---|---|---|
| Company | Anthropic | Sakana AI |
| Release Date | September 22, 2026 | August 3, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 256K |
| Context (output) | 128K | 256K |
| Input Price / 1M | $4.00 | $0.95 |
| Output Price / 1M | $20.00 | $4.00 |
| Average Score | 71.1% | 92.4% |
Verdict
Claude Opus 5.5 leads in 2 out of 4 comparison categories.
Both models show comparable average scores: Claude Opus 5.5 — 0.7, Sakana Namazu — 0.9.
Sakana Namazu is 4.8x cheaper: input $0.95/1M vs $4.00/1M tokens.
Claude Opus 5.5 supports a larger context: 1M vs 256K tokens.
Claude Opus 5.5 is newer: released 9/22/2026 vs 8/3/2026.
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Frequently Asked Questions
Which is better for coding — Claude Opus 5.5 or Sakana Namazu?
Which model is cheaper — Claude Opus 5.5 or Sakana Namazu?
Which has a larger context window — Claude Opus 5.5 or Sakana Namazu?
The Claude Opus 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 Opus 5.5 or Sakana Namazu page. See also the complete list of AI model comparisons.