Fugu Ultra
Fugu Ultra is worth evaluating for coding, rag, and agents when its provider route and context window match the workload.
Use it for
- Teams evaluating coding, rag, and agents
- Workloads that can use a 1m context window
- Buyers comparing 2 tracked provider routes
Do not use it for
- Workloads where another current model has stronger sourced task evidence
- Family
- Fugu
- Released
- 2026-06-22
- Context
- 1m
- Architecture
- Composition of Experts
- Specialization
- general
- Openness
- Proprietary
- License
- ProprietaryCommercial use: conditional
- Training
- Reinforcement Learning
Cheapest of 2 routes · Sakana AI · cache read $0.500
About
Fugu Ultra is Sakana AI's quality-optimized multi-agent orchestration model. Achieves SWE-Bench Pro 73.7, LiveCodeBench 93.2, GPQA-D 95.5. Supports extended context beyond 272K tokens at higher pricing. Versioned API ID: fugu-ultra-20260615. Supports text and image input, reasoning effort levels (high, xhigh/max), structured outputs, and function calling via OpenAI-compatible API (base_url: https://api.sakana.ai/v1). Not available in EU/EEA.
Fugu Ultra is a proprietary model in the Fugu family. The structured metadata tracks a 1m-token context window, multimodal input, reasoning, function calling, tool use, and structured outputs. This page tracks provider routes through Sakana AI and Vercel AI Gateway, with the cheapest tracked route listed at $5 input and $30 output per 1M tokens. Headline tracked benchmarks include SWE-bench Pro 73.7, Terminal-Bench 2.1 82.1, and LiveCodeBench 93.2.
Top use-case fit: coding, agents, and build tasks
Coding
Q/$ D2 relevant benchmarks in the decision map.
RAG
Included by capability and metadata signals in the decision map.
Agents
Included by capability and metadata signals in the decision map.
Provider price ladder
Compare all 2Compare API pricing across 2 providers for input and output tokens, batch, and cached reads when available.
| Provider | Input / 1M | Output / 1M | Cache | Route |
|---|---|---|---|---|
| Sakana AI | $5.00 | $30.00 | read $0.500 | Serverless |
| Vercel AI Gateway | $5.00 | $30.00 | read $0.500 | Serverless |
Capabilities
Benchmark peer barsfor Coding
Benchmark scores(6)
| Benchmark | Score | Version | Source |
|---|---|---|---|
| SWE-bench Pro | 73.7 | SWE-bench Pro, Sakana AI-reported | https://sakana.ai/fugu/ |
| Terminal-Bench 2.1 | 82.1 | Terminal-Bench 2.1, Sakana AI-reported | https://sakana.ai/fugu/ |
| LiveCodeBench | 93.2 | LiveCodeBench, Sakana AI-reported | https://sakana.ai/fugu/ |
| Google-Proof Q&A | 95.5 | diamond | https://sakana.ai/fugu/ |
| Humanity's Last Exam | 50.0 | Humanity's Last Exam, Sakana AI-reported | https://sakana.ai/fugu/ |
| CharXiv | 86.6 | reasoning | https://sakana.ai/fugu/ |
Migration checks
No linked migration route is available for this model yet.
Rankings & picks(4)
Cheapest of 2 routes · Sakana AI · cache read $0.500