$ diff claude-opus-5-5 fugu-max
Claude Opus 5.5 vs Fugu Max
Values come from Claude Opus 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 Opus 5.5
- context
- 1M
- weights
- closed
- $/M in
- $4
- $/M out
- $20
- 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.
- Input price
- Fugu Max at $2/M against $4/M — 2.0× cheaper to feed.
- Output price
- Fugu Max at $6/M against $20/M — 3.3× cheaper to generate. Output dominates the bill on most agentic workloads, where the model writes far more than it reads.
- Recency
- Claude Opus 5.5 shipped 11 days after Fugu Max (2026-09-22 vs 2026-09-11).
Full spec
| Attribute | Claude Opus 5.5 | Fugu Max |
|---|---|---|
| Developer | Anthropic | Sakana AI |
| Released | 2026-09-22 | 2026-09-11 |
| Context window | 1M tokens | 1,000,000 |
| Pricing | $4/M input · $20/M output · cache reads $0.20/M · cache writes $5/M | $2/M input · $6/M output |
| License | proprietary (API-only; no weight release) | not recorded |
| Availability | Claude apps, Claude Code, Claude API as `claude-opus-5-5`, Amazon Bedrock, Google Cloud Vertex AI, Microsoft Foundry | Sakana API (OpenAI-compatible), OpenRouter, NanoGPT, Kilo Gateway, LLM Gateway |