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What is Fugu-Ultra v1.1?

Fugu-Ultra v1.1 is the upgraded multi-agent orchestration model created by Sakana AI, specifically engineered for complex coding challenges, agent-centric tasks, and advanced reasoning abilities. Rather than relying solely on a single model, it skillfully coordinates a range of state-of-the-art models, selecting and combining specialized agents that are optimally suited for specific tasks, all while maintaining a cohesive model interface. The recent orchestration enhancement in v1.1 introduces newer frontier models, yielding improved performance metrics across numerous benchmarks and achieving gains of up to 7.9 points over v1.0, with particularly remarkable results on ProgramBench and Terminal Bench 2.1. Furthermore, Fugu is now capable of integrating flawlessly within Claude Code through compatible endpoints, facilitating a collaborative ecosystem of models that operate seamlessly in user-friendly terminal environments for coding, debugging, reviewing, and executing scripts. Users can swiftly establish this integration with a simple one-command installer on both Ubuntu and macOS, while alternative manual setup options are available for Windows and other operating systems, thereby ensuring accessibility for a wide range of users. This innovative advancement not only optimizes workflows but also significantly boosts productivity by harnessing the unique strengths of multiple specialized agents, ultimately leading to more efficient software development practices. Such improvements reflect Sakana AI's commitment to enhancing the capabilities and usability of their orchestration models in response to user needs.

What is Claude Opus 5.5?

Claude Opus 5.5 is Anthropic’s high-capability AI model for advanced coding, research, business work, computer use, and extended agentic tasks. It is designed to operate effectively on large and complex workloads that require planning, sustained context, tool use, verification, and multiple execution steps. In software engineering, Opus 5.5 can be used for codebase-wide migrations, debugging, audits, optimization, code review, and other long-running development projects. The model also supports knowledge-intensive work such as financial analysis, legal research, spreadsheet creation, executive presentations, data collection, and professional reporting. Anthropic reports that Opus 5.5 improves both task efficiency and serving efficiency compared with Opus 5, including lower token usage, faster output, and reduced cost on typical workloads. Its writing and communication behavior has been updated to prioritize important information, reduce unclear phrasing, and better follow requested style constraints. Opus 5.5 also includes stronger safeguards for autonomous and tool-using scenarios, including action screening, improved prompt-injection resistance, sandbox support, and vulnerability detection during code review. Anthropic applies additional safeguards to cybersecurity, biology, and model-distillation use cases, with expanded access programs available to verified organizations in certain sensitive fields. The model supports zero data retention and includes watermarking measures intended to support compliance requirements such as the EU AI Act. Developers can access Opus 5.5 through the Claude Platform using the claude-opus-5-5 model, while Claude Code and other Anthropic products can use it for interactive and agentic work. Claude Opus 5.5 is also available through Amazon Web Services, Google Cloud, and Microsoft Azure for organizations that prefer to deploy through major cloud platforms.

Media

Media

Integrations Supported

Augment Code
Claude Design
Claude Security
Cody
DataGrip
Doraverse
Emergent
GoLand
Kotlin
Muse
Objective-C
OpenClaw.Direct
OpenTag
PowerShell
R
Ruby
Rust
RustRover
Vellum
Xcode

API Availability

Has API

API Availability

Has API

Pricing Information

$6 per 1M tokens (input)
$6 per 1M tokens (input), $36 per 1M tokens (output)

Pricing Information

$4 per 1M tokens (input)
$4 per million input tokens and $20 per million output tokens.

Cache reads, which account for most costs in agentic and coding workloads, are priced at just $0.20 per million tokens which is 60% cheaper than Opus 5. Opus 5.5 also delivers output over 30% faster than its predecessor.

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-1-1-claude-code-interface/

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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