Fugu Ultra
Quality-first multi-agent model for hard research, analysis, and competitions.
- Capability
- —No ECI score yet
- Input
- $5.00per 1M tokens
- Output
- $30.00per 1M tokens
- Context
- 1Mtokens
What it costs
- Input
- $5.00per million tokens
- Output
- $30.00per million tokens
- Cached input
- $0.50per million tokens
- Over 272K tokens
- $10.00 / $45.00input / output per million
- Blended (3:1)
- $11.25pricier than 94% of priced models
Typical monthly bills
| Monthly usage | Estimated cost |
|---|---|
| Side project2M input + 0.5M output tokens | $25.00 |
| Team assistant25M input + 5M output tokens | $275.00 |
| Production app250M input + 50M output tokens | $2,750 |
Official Sakana AI API price, as listed on models.dev.
Independent benchmarks
Epoch AI has not published a Capabilities Index score for Fugu Ultra yet.
The details
- Lab
- Sakana AI
- Released
- Jun 15, 2026
- Context window
- 1,000,000 tokens
- Inputs
- Text, Images
- Output
- Text
- Reasoning
- Adjustable effort high · xhigh
- Tool calling
- Yes
- Structured output
- Yes
- Weights
- Proprietary
- API model ID
fugu-ultraon Sakana AI- Availability
- 11 API providerslisted on models.dev
What Sakana AI claims
Published by the lab at launch. Settings vary, so compare these only with care.
| Benchmark | Score | Setting | Source |
|---|---|---|---|
| SWE Bench Pro | 73.7 | — | Source |
| Terminal Bench 2.1 | 82.1 | — | Source |
| LiveCodeBench | 93.2 | — | Source |
| LiveCodeBench Pro | 90.8 | — | Source |
| Humanity’s Last Exam | 50 | — | Source |
| CharXiv Reasoning | 86.6 | — | Source |
| GPQA Diamond | 95.5 | — | Source |
| SciCode | 58.7 | — | Source |
| τ3 Banking | 20.6 | — | Source |
| Long Context Reasoning | 73.3 | — | Source |
| MRCRv2 | 93.6 | — | Source |
| CTI-REALM | 69.4 | — | Source |
More from Sakana AI
About Fugu Ultra
How much does Fugu Ultra cost?
Fugu Ultra costs $5.00 input / $30.00 output per million tokens (official Sakana AI API price). Cached input is $0.50 per million tokens. Requests over 272K tokens are billed at $10.00 input / $45.00 output. At a 3:1 input-to-output mix that is $11.25 per million tokens, more expensive than 94% of the 360 priced models we track.
What is the context window of Fugu Ultra?
Fugu Ultra accepts up to 1,000,000 tokens per request.
How good is Fugu Ultra?
Epoch AI has not published a Capabilities Index score for Fugu Ultra yet.
Is Fugu Ultra open source?
No. Fugu Ultra is proprietary; you use it through Sakana AI’s API or partner platforms.
What inputs does Fugu Ultra support?
Fugu Ultra accepts text and images and replies in text. It is a reasoning model with high and xhigh effort settings, supports tool calling and can return structured JSON output.
When was Fugu Ultra released?
Sakana AI released Fugu Ultra on Jun 15, 2026.
What are the best alternatives to Fugu Ultra?
The closest current models from other labs on capability, price and release date are Claude Mythos 5 (Anthropic, $10.00 / $50.00), Qwen 3.8 Max Prime (Alibaba (Qwen), $4.00 / $12.00), Command A Plus (Cohere, $2.50 / $10.00) and MiMo-V2.6-Pro-UltraSpeed (Xiaomi, $4.35 / $8.70).