Sakana AI · Released Sep 11, 2026Fugu Ultra v2
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
- 1M128K max output
What it costs
- Input
- $5.00per million tokens
- Output
- $30.00per million tokens
- Blended (3:1)
- $11.25pricier than 95% 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 |
Median of 6 paid API providers on models.dev.
Independent benchmarks
Epoch AI has not published a Capabilities Index score for Fugu Ultra v2 yet.
The details
- Lab
- Sakana AI
- Released
- Sep 11, 2026
- Knowledge cutoff
- Aug 28, 2026
- Context window
- 1,000,000 tokens
- Max output
- 128,000 tokens
- Inputs
- Text, Images, PDFs
- Output
- Text
- Reasoning
- Always on
- Tool calling
- Yes
- Structured output
- No
- Weights
- Proprietary
- Availability
- 6 API providerslisted on models.dev
More from Sakana AI
About Fugu Ultra v2
How much does Fugu Ultra v2 cost?
Fugu Ultra v2 costs $5.00 input / $30.00 output per million tokens (median across 6 API providers). At a 3:1 input-to-output mix that is $11.25 per million tokens, more expensive than 95% of the 445 priced models we track.
What is the context window of Fugu Ultra v2?
Fugu Ultra v2 accepts up to 1,000,000 tokens per request and can write up to 128,000 tokens in one response.
How good is Fugu Ultra v2?
Epoch AI has not published a Capabilities Index score for Fugu Ultra v2 yet.
Is Fugu Ultra v2 open source?
No. Fugu Ultra v2 is proprietary; you use it through an API or partner platforms.
What inputs does Fugu Ultra v2 support?
Fugu Ultra v2 accepts text, images and PDFs and replies in text. It is a reasoning model, supports tool calling.
When was Fugu Ultra v2 released?
Sakana AI released Fugu Ultra v2 on Sep 11, 2026. Its training data runs to Aug 28, 2026.
What are the best alternatives to Fugu Ultra v2?
The closest current models from other labs on capability, price and release date are Ember-1 (Fireworks AI, $3.00 / $15.00), Qwen 3.8 Max Prime (Alibaba (Qwen), $4.00 / $12.00), MiMo-V2.6-Pro-UltraSpeed (Xiaomi, $4.35 / $8.70) and Claude Mythos 5 (Anthropic, $10.00 / $50.00).