$ diff claude-sonnet-5-5 fugu-max
Claude Sonnet 5.5 vs Fugu Max
Values come from Claude Sonnet 5.5 and Fugu Max, where each is cited to its source. This page states no benchmark result and ranks neither model — it puts two published specifications next to each other. Where a lab has not published a figure, the row says so rather than guessing.
AnthropicClaude Sonnet 5.5
- context
- 1M
- weights
- closed
- $/M in
- $2
- $/M out
- $10
- context
- 1M
- weights
- —
- $/M in
- $2
- $/M out
- $6
What actually differs
- Context window
- Identical — both accept 1M tokens, so context length is not a reason to pick either.
- Output price
- Fugu Max at $6/M against $10/M — 1.7× cheaper to generate. Output dominates the bill on most agentic workloads, where the model writes far more than it reads.
- Recency
- Claude Sonnet 5.5 shipped 17 days after Fugu Max (2026-09-28 vs 2026-09-11).
Full spec
| Attribute | Claude Sonnet 5.5 | Fugu Max |
|---|---|---|
| Developer | Anthropic | Sakana AI |
| Released | 2026-09-28 | 2026-09-11 |
| Context window | 1M tokens | 1,000,000 |
| Pricing | $2/M input · $10/M output · cache reads 10% of base input | $2/M input · $6/M output |
| License | proprietary (API-only; no weight release) | not recorded |
| Availability | Claude apps, Claude API as `claude-sonnet-5-5`, Amazon Bedrock, Google Cloud Vertex AI, Microsoft Foundry, Claude Platform on AWS | Sakana API (OpenAI-compatible), OpenRouter, NanoGPT, Kilo Gateway, LLM Gateway |