fugu-max
Fugu Max is the cost-performance model in Sakana AI’s Fugu family, a learned multi-agent orchestration system in which a trained language model routes work across other models.
Pricing: Input 480 credits / 1M tokens (≈ $2.40), Output 1440 credits / 1M tokens (≈ $7.20).
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Fugu Max API on ModelFold
Fugu Max is the cost-performance model in Sakana AI’s Fugu family, a learned multi-agent orchestration system in which a trained language model routes work across other models. Try Fugu Max in the ModelFold Playground, then call it from your own code through an OpenAI-compatible chat completions API.
What Is the Fugu Max API
Fugu Max at a glance
Fugu Max is a chat model from Sakana AI. It accepts text, images and files (such as PDF) as input and returns text, with a context window of up to 1M tokens.
Use it without hosting anything
On ModelFold you call Fugu Max with a single API key — no model weights to download and no inference servers to run. The same key also works for the other chat, image, video and audio models on ModelFold.
Core Capabilities of Fugu Max
Up to 1M tokens of context
Keep long conversations, large documents and sizeable code in a single request, so the model can reason over the full material instead of fragments.
Understands images and files (such as PDF)
Besides text, Fugu Max accepts images and files (such as PDF) as input, so a single request can combine instructions with visual or other media.
Function calling
Fugu Max supports tool (function) calling: describe your functions in the request and the model returns structured calls your code can run — the basis for agents and integrations.
Adjustable reasoning effort
Choose a reasoning effort level (low, medium or high) per request to balance depth of thinking against speed and token usage.
Structured outputs
Ask for JSON that follows a schema (response_format), which makes extraction, classification and system integrations more reliable.
How to Use Fugu Max on ModelFold
- 1
Step 1: Try it in the Playground
Open the Playground at the top of this page, type a prompt and see how Fugu Max responds before writing any code.
- 2
Step 2: Create an API key
Sign in to ModelFold and create an API key in the console. Keep it secret and send it as a Bearer token.
- 3
Step 3: Send a request
Call POST https://modelfold.ai/v1/chat/completions with "model": "fugu-max" and your messages. Existing OpenAI-compatible SDKs work by changing the base URL and key.
- ✓
Step 4: Ship and monitor
Integrate the response into your product and check token usage and spend for every call in the console logs.
What You Can Build with Fugu Max
Autonomous agents
Build agents that plan multi-step tasks, call your tools and APIs, and keep working toward a goal across long sessions.
High-volume pipelines
Run classification, extraction, rewriting and batch jobs at scale where cost per request matters.
Analysis and complex reasoning
Work through research questions, data interpretation, planning and other problems that need careful step-by-step reasoning.
AI coding assistants
Generate, explain, debug and refactor code, review pull requests and work through multi-file changes in developer tools and IDE plugins.
Frequently Asked Questions
What is Fugu Max?⌄
Fugu Max is the cost-performance model in Sakana AI’s Fugu family, a learned multi-agent orchestration system in which a trained language model routes work across other models.
Which inputs does Fugu Max support?⌄
Fugu Max accepts text, images and files (such as PDF) and returns text. Through ModelFold you can send text and images (OpenAI-style image_url content); in the Playground you can also attach documents, which are converted to text.
How long is the context window of Fugu Max?⌄
Up to 1M tokens, shared between your input and the model’s output.
Does Fugu Max support function calling?⌄
Yes. Fugu Max supports tools / function calling through the standard tools parameter of the chat completions API.
How is Fugu Max billed on ModelFold?⌄
Pay as you go by tokens: input and output tokens are charged at the per-million-token prices shown on this page. There is no monthly fee, and failed requests are not charged.
How do I call Fugu Max through the API?⌄
Send a POST request to https://modelfold.ai/v1/chat/completions with "model": "fugu-max", using your ModelFold API key as the Bearer token.
| Input | 480 credits 1M tokens≈ $2.40 |
| Output | 1440 credits 1M tokens≈ $7.20 |
Billed per token: input and output are priced separately, and thinking tokens count as output. The Playground charges exactly the same way.
Read API docs →AI Agents · Claude Code / Cursor / Trae →curl https://modelfold.ai/v1/chat/completions \
-H "Authorization: Bearer $MODELFOLD_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"fugu-max","messages":[{"role":"user","content":"Hello"}]}'