WritingmateWritingmate

AI model reference · 2026

Fugu Ultra

Sakana AIModel details, evidence, and API facts

Fugu Ultra is the higher-performance model in Sakana AI's Fugu family.

Text generation
Image input
Reasoning
Provider endpoint accepts tool parameters
Try Fugu UltraCompare with another model
Context window
1,000,000 tokens
Maximum output
128,000 tokens
Base provider API input
$5.00 / 1M tokens
Starting provider API rate; context tiers apply
Published evidence
Not available

Overview

About Fugu Ultra

A concise catalog overview. Technical limits and published evaluation evidence are listed separately below.

Fugu Ultra is the higher-performance model in Sakana AI's Fugu family.

text
multimodal
reasoning

Published evaluations

Benchmark results

Only results mapped to this exact model and backed by a named source appear here. Different evaluation protocols are not treated as interchangeable.

No reviewed benchmark result is available for this exact model yet. We leave this section empty instead of assigning a nearby model’s score.

Human preference

Arena results

Arena scores come from blind human preference votes. They are reported separately from task benchmarks and are not used as substitutes for missing benchmark results.

No exact Arena match is available for this model. Similar names and provider variants are not merged automatically.

Technical reference

Specifications and API facts

Technical limits and reference provider prices come from the current catalog unless a reviewed external source is listed. Missing values stay marked as unavailable.

Model
Provider
Sakana AI
Release date
Not available in reviewed sources
Catalog added
Jun 24, 2026
Context window
1,000,000 tokens
Maximum output
128,000 tokens
Knowledge cutoff
Not available in reviewed sources
License
Not available in reviewed sources
Capabilities and API
Input types
Text, Image
Output types
Text
Reasoning
Supported
Provider endpoint tool parameters
Accepts tool parameters
Base provider API input
$5.00 / 1M tokens
Base provider cached input
$0.50 / 1M tokens
Base provider API output
$30 / 1M tokens
Provider tier at ≥ 272,000 prompt tokens
Input $10 / 1M tokensOutput $45 / 1M tokensCached input $1.00 / 1M tokens

Provider token rates are context-dependent. The base rates apply below the listed prompt thresholds; the matching tier applies at or above each threshold.

These are reference provider API rates, not Writingmate checkout charges. Access in Writingmate follows the allowances of your Writingmate plan.

Provenance

Sources and update status

Source links are attached to the facts and evaluations they support. Catalog-only values are not presented as independently verified claims.

Evidence update date is not available.

Catalog record updated Jun 24, 2026.

Catalog-added dates describe when a model entered the catalog, not necessarily its public release date.

Try Fugu Ultra in Writingmate

Use this model, then compare its response with other AI models in the same workspace.

Get startedCompare models