GPT-5.1 Medium vs Sakana Namazu: Specs & Benchmark Comparison
GPT-5.1 Medium is developed by OpenAI, while Sakana Namazu comes from Sakana AI. GPT-5.1 Medium was released in November 2025, and Sakana Namazu followed 9 months later in August 2026.
We have 1 benchmark result for GPT-5.1 Medium and 3 benchmark results for Sakana Namazu, but they were measured on different benchmarks, so there is no like-for-like scoreboard.
On price the two are close: GPT-5.1 Medium costs $1 per million input tokens and $4 per million output tokens, Sakana Namazu $0.95 and $4. Both accept a context window of about 256K tokens. Both accept text and images as input. On tooling, only GPT-5.1 Medium supports function calling and only GPT-5.1 Medium offers structured output.
| Characteristic | GPT-5.1 Medium | Sakana Namazu |
|---|---|---|
| Company | OpenAI | Sakana AI |
| Release Date | November 11, 2025 | August 3, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 256K | 256K |
| Context (output) | 64K | 256K |
| Input Price / 1M | $1.00 | $0.95 |
| Output Price / 1M | $4.00 | $4.00 |
| Average Score | 98.0% | 92.4% |
Verdict
Sakana Namazu leads in 2 out of 4 comparison categories.
Both models show comparable average scores: GPT-5.1 Medium — 1.0, Sakana Namazu — 0.9.
Sakana Namazu is 1.0x cheaper: input $0.95/1M vs $1.00/1M tokens.
Same context size: 256K tokens.
Sakana Namazu is newer: released 8/3/2026 vs 11/11/2025.
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Frequently Asked Questions
Which is better for coding — GPT-5.1 Medium or Sakana Namazu?
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The GPT-5.1 Medium 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 GPT-5.1 Medium or Sakana Namazu page. See also the complete list of AI model comparisons.