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Total 5 out of 5 stars
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features 5 out of 5 stars

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What is Sakana Fugu Ultra?

Sakana Fugu Ultra is the advanced, performance-focused model in the Sakana Fugu platform, designed to coordinate multiple expert AI agents for difficult and high-stakes work. It is built for users who need stronger results on complex multi-step tasks than a single model or basic AI assistant can usually provide. Through one OpenAI-compatible API, Fugu Ultra dynamically selects and coordinates agents from a powerful model pool while presenting the experience as one model. This allows teams to use multi-agent intelligence without manually building agent workflows, assigning roles, or switching between different providers. Fugu Ultra is optimized for demanding use cases such as software engineering, code review, Kaggle competitions, paper reproduction, cybersecurity analysis, scientific problem solving, literature investigations, patent analysis, and autonomous research. The system is grounded in research-driven orchestration methods, including TRINITY and the Conductor, which focus on learning how to route tasks, coordinate agents, and create effective collaboration patterns. Compared with the standard Fugu model, Fugu Ultra uses a deeper expert pool to prioritize quality on harder problems. It is designed for workloads where precision, reasoning depth, completeness, and reliability are more important than low latency alone. Organizations can opt out of specific models or providers in the agent pool to meet data, privacy, compliance, procurement, or internal governance requirements. Fugu Ultra also includes fixed pay-as-you-go pricing for input, output, and cached input tokens, with higher rates for very long context usage. Sakana Fugu Ultra helps technical teams plug advanced multi-agent orchestration into existing workflows while reducing single-vendor dependency and improving performance on challenging AI tasks.

What is Claude Fable 5.2?

Claude Fable 5.2 is an advanced frontier AI model developed by Anthropic to support demanding technical work, autonomous software engineering, scientific research, and complex reasoning tasks. The model shares its underlying architecture with Claude Mythos 5.2 but includes additional cybersecurity and biology safeguards that allow Anthropic to provide broader access to its capabilities. Claude Fable 5.2 improves on previous generations through stronger code generation, engineering judgment, mathematical problem-solving, visual interpretation, and execution of long-running agentic workflows. Its software engineering capabilities enable AI agents to analyze large repositories, investigate bugs, implement features, optimize application performance, conduct code reviews, and complete substantial software migrations. The model can coordinate large groups of specialized subagents, delegate simpler tasks to smaller models, and maintain progress across extended development projects requiring multiple stages of planning, implementation, and verification. Anthropic demonstrated these capabilities through experimental projects involving a Python-to-Rust production migration and the creation of a prototype operating system using more than 1,000 coordinated subagents. Scientific and engineering capabilities include mathematical proof development, physics research, electronic circuit design, robotics control, and iterative experimentation using external computational tools. Claude Fable 5.2 achieved benchmark scores of 49.1% on FrontierCode 2.0, 69.9% on FrontierSWE v2, 51.4% on AutomationBench, 74.2% on Humanity's Last Exam with tools, and 73.4% on Chartography. The model supports configurable reasoning effort and produces output up to 30% faster than Fable 5.1, with an optional fast mode that increases token generation speed by up to 2.5 times.

Media

Media

Integrations Supported

Claude Code
Vercel AI Gateway

Integrations Supported

Claude Code
Vercel AI Gateway
Amp
CSS
Charlie
Claude Pro
Dart
DataGrip
GoLand
IntelliJ IDEA
Julia
Mimasa AI
PHP
ReSharper
Ruby
SQL
Shipper.now
Skymel
Snowflake
Trinity-Large-Thinking

API Availability

Has API

API Availability

Has API

Pricing Information

$20 per month

Pricing Information

$8 per 1M tokens (input)
$8 per million input tokens and $40 per million output tokens

Supported Platforms

SaaS

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

Sakana AI

Date Founded

2023

Company Location

Japan

Company Website

sakana.ai/fugu/

Company Facts

Organization Name

Anthropic

Date Founded

2021

Company Location

United States

Company Website

claude.ai

Categories and Features

AI Coding Models

Not specified

AI Models

Not specified

Large Language Models

Not specified

Categories and Features

AI Coding Models

Not specified

AI Models

Not specified

AI Reasoning Models

Not specified

AI Vision Models

Not specified

Foundation Models

Not specified

Large Language Models

Not specified

Multimodal Models

Not specified

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