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Sakana: Fugu Ultra

Quality-first multi-agent model for hard research, analysis, and competitions

Source-linked fugu Closed weights Released 2026-06-15
API record Report
InputT
OutputT
Input price$5/M
Output price$30/M
Context1M
Max outputNot documented
Providers12
Inference availability

Providers

Provider-specific identifiers, limits, and listed prices per million tokens. Every row links back to the provider's own documentation.

Report a price
Providers offering Fugu Ultra
ProviderProvider model IDContextMax outputInputOutputCache readCapabilitiesDocs
Merge Gateway sakana/fugu-ultra 1M 250K $5 $30 $0.5 ReasoningTools Docs ↗
OpenRouter sakana/fugu-ultra 1M 128K $5 $30 $0.5 ReasoningToolsJSON Docs ↗
Requesty fugu-ultra 1.04858M 131.072K $5 $30 $0.5 ReasoningTools Docs ↗
Kilo Gateway sakana/fugu-ultra 1M 128K $5 $30 $0.5 ReasoningToolsJSON Docs ↗
Sakana AI fugu-ultra-20260615 1M 1M $5 $30 $0.5 ReasoningToolsJSON Docs ↗
Vercel AI Gateway sakana/fugu-ultra 1M 1M $5 $30 $0.5 ReasoningToolsJSON Docs ↗
Pioneer sakana/fugu-ultra 1M 131.072K $5 $30 $0.5 ReasoningToolsJSON Docs ↗
Sakana AI fugu-ultra 1M 1M $5 $30 $0.5 ReasoningToolsJSON Docs ↗
NanoGPT sakana/fugu-ultra 1M 16.384K $5 $30 $0.5 ReasoningToolsJSON Docs ↗
LLM Gateway sakana/fugu-ultra 1M 1M $5 $30 $0.5 ReasoningTools Docs ↗
LLMTR sakana/fugu-ultra 1M 1M $5 $30 ReasoningToolsJSON Docs ↗
EmpirioLabs AI fugu-ultra 1M 131.072K $7.5 $45 $1.5 ReasoningToolsJSON Docs ↗

Capability badges appear only where the provider catalog explicitly lists support. A blank cell means the source is silent, not that the feature is absent.

Listed rates

Price across providers

Input price per million tokens as published by each provider. Bars are drawn from listed rates only — no traffic weighting, since the catalog observes no requests.

Lowest input $5/M

Across 12 priced providers

Median input $5/M

Midpoint of listed rates

Highest input $7.5/M

1.5× the lowest listed rate

Output range $30 – $45

Per million output tokens

Merge Gateway $5/M
OpenRouter $5/M
Requesty $5/M
Kilo Gateway $5/M
Sakana AI $5/M
Vercel AI Gateway $5/M
Pioneer $5/M
Sakana AI $5/M
NanoGPT $5/M
LLM Gateway $5/M
LLMTR $5/M
EmpirioLabs AI $7.5/M
Cost calculator

Estimate a workload

$0.00
Excludes taxes, non-token charges, and tiered discounts.

11 providers list the identical $5 input rate, so price alone will not separate them — compare context limits, max output, and capabilities above.

Context limits also differ by provider, from 1M to 1.04858M tokens. Compare the provider table above before choosing on price alone.

Specification

Capabilities

Recorded from the source catalog and provider listings.

Reasoning Yes
Tool calling Yes
Structured output Yes
Attachments Yes
Vision input Yes
× Open weights No
Creator
Sakana
Model family
fugu
Knowledge cutoff
Not documented
License
Not documented
Release date
2026-06-15
Model ID
sakana/fugu-ultra
Published evaluations

Benchmarks

Every result stays attached to its source, version, metric and harness. Scores from different versions are never merged, and the profile below plots each benchmark against its own population rather than on a shared scale.

Benchmark registry
SciCode score Source ↗
SciCode #2 of 3
CTI-REALM score Source ↗
69.4 2 models scored — too few for a distribution
CharXiv Reasoning score Source ↗
86.6 2 models scored — too few for a distribution
GPQA Diamond score Source ↗
95.5 2 models scored — too few for a distribution
Humanity’s Last Exam score Source ↗
50.0 2 models scored — too few for a distribution
LiveCodeBench score Source ↗
93.2 2 models scored — too few for a distribution
LiveCodeBench Pro score Source ↗
90.8 2 models scored — too few for a distribution
Long Context Reasoning score Source ↗
73.3 2 models scored — too few for a distribution
MRCRv2 score Source ↗
93.6 2 models scored — too few for a distribution
SWE Bench Pro score Source ↗
73.7 2 models scored — too few for a distribution
Terminal Bench 2.1 score Source ↗
82.1 2 models scored — too few for a distribution
τ3 Banking score Source ↗
20.6 2 models scored — too few for a distribution

Each strip shows every published score for that benchmark, with this model marked. The lighter shape behind the ticks is the density of results, and the dashed line is the median.

Catalog activity

Change log

Field-level changes detected between successful source imports.

Full change log
No changes recorded

This record has not changed within the retained import history.

Provenance

Sources & verification

Every figure on this page traces back to one of these records.

Methodology
Public API

Use this record

Fetch the complete source-linked model record. No key, no account, no rate-limited tier.

API documentation
Endpoint
GET https://model.kyssta.lol/api/v1/models/sakana/fugu-ultra
curl
curl "https://model.kyssta.lol/api/v1/models/sakana/fugu-ultra"
Common questions

Frequently asked questions

Answered directly from the stored record — nothing here is generated beyond the catalog's own fields.

What is Fugu Ultra?

Quality-first multi-agent model for hard research, analysis, and competitions. It is published by Sakana and catalogued here from Models.dev.

How much does Fugu Ultra cost?

Listed input pricing starts at $5 per million tokens from Merge Gateway, rising to $7.5 across 12 listed providers.

What is the context length of Fugu Ultra?

Fugu Ultra accepts up to 1M tokens of context.

Does Fugu Ultra support tool calling and structured output?

Provider catalogs list support for tool calling, structured output, reasoning, and image input.

Which providers serve Fugu Ultra?

11 providers list this model: Merge Gateway, OpenRouter, Requesty, Kilo Gateway, Sakana AI, Vercel AI Gateway and 5 more.

Are the weights for Fugu Ultra open?

No. This model is served through hosted APIs only.

When was Fugu Ultra released?

The catalog records a release date of 2026-06-15, last verified Sep 11, 2026.

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