Claude Haiku 5.5 Reviews & Ratings

Claude Haiku 5.5

5.0 out of 5 stars

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features 0 out of 5 stars
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Total 5 out of 5 stars
features 4 out of 5 stars

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What is Claude Mythos 5.2?

Claude Mythos 5.2 is a frontier AI model developed by Anthropic to support advanced cybersecurity research, biomedical discovery, autonomous software engineering, and complex scientific reasoning. The model shares the same underlying architecture as Claude Fable 5.2 but is made available to verified organizations that require access to capabilities restricted by Fable's cybersecurity and biology safeguards. Its cybersecurity research capabilities include analyzing source code, identifying vulnerabilities, investigating software weaknesses, validating security findings, and supporting authorized penetration testing activities. Claude Mythos 5.2 can examine historical software versions to independently rediscover known vulnerabilities, helping researchers evaluate security risks and prioritize remediation efforts. Anthropic reports that the model identified 10.2% more vulnerabilities than Claude Opus 5.5 and 14.4% more than Claude Mythos 5.1 in its internal vulnerability rediscovery evaluations. Its published cybersecurity benchmark results include 76.3% on CyScenarioBench and 89.6% on CVE Rediscovery, reflecting improvements in technical security reasoning and vulnerability identification. In biological research, the model supports protein engineering, computational biology, molecular analysis, and scientific problem-solving, achieving 85.1% on a de novo protein binder design evaluation. The underlying model also demonstrates strong performance in software engineering, mathematics, scientific experimentation, visual reasoning, and agentic workflows that require multiple stages of planning and execution. Anthropic reports that Claude Mythos 5.2 generates output up to 30% faster than Mythos 5.1, with an optional fast mode that increases token generation speed by up to 2.5 times.

What is Claude Haiku 5.5?

Claude Haiku 5.5 is an Anthropic AI model built for high-volume and latency-sensitive AI workloads that require a balance of speed, cost, context capacity, and reasoning. Its primary use cases include classification, routing, information extraction, and subagent tasks within larger AI systems. Claude Haiku 5.5 introduces adaptive thinking, which allows the model to decide when reasoning is needed and how much thinking to apply before producing a response. Adaptive thinking is enabled by default, while the effort parameter gives developers a way to trade response quality against latency and cost. Developers can disable thinking at high effort or below, but Anthropic recommends using effort as the primary mechanism for controlling the model's reasoning behavior. The model provides a 1 million token context window, representing a substantial increase from the 200,000-token context window available with Claude Haiku 4.5. It can generate as many as 128,000 output tokens compared with the previous model's 64,000-token maximum, although thinking tokens are included within the configured output allowance. Browser use is available through the Claude API and Google Cloud, enabling developers to incorporate the model into workflows that require interaction with browser-based environments. Claude Haiku 5.5 uses the newer tokenizer found in Claude 4.7 and later models, resulting in approximately 30% more tokens for the same text compared with Claude Haiku 4.5, depending on the content. The model also changes several API behaviors, including replacing manual extended thinking with adaptive thinking, rejecting non-default sampling parameters and assistant-message prefills, and requiring updated computer-use tooling for supported environments.

Media

Media

Integrations Supported

Anything
Claude Duet
Claude Science
Claw Code
Cody
Dessix
Devin
HTML
Hermes Agent
Higgsfield Supercomputer
LaunchLemonade
Lovable
Mimasa AI
OpenClaw.Direct
ReSharper
React
Scalestack
Sup AI
Trinity-Large-Thinking
Yonoo

Integrations Supported

Anything
Claude Duet
Claude Science
Claw Code
Cody
Dessix
Devin
HTML
Hermes Agent
Higgsfield Supercomputer
LaunchLemonade
Lovable
Mimasa AI
OpenClaw.Direct
ReSharper
React
Scalestack
Sup AI
Trinity-Large-Thinking
Yonoo

API Availability

Has API

API Availability

Has API

Pricing Information

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

Pricing Information

$0.10 per 1M tokens (input)
For prompts under 100K tokens, it's $0.10 input / $0.50 output per million tokens with cache reads at $0.01. Above 100K tokens, $0.50 input / output $2.50 per million, with cache reads at $0.05.

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

Anthropic

Date Founded

2021

Company Location

United States

Company Website

claude.ai

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

AI Reasoning Models

Not specified

AI Vision Models

Not specified

Foundation Models

Not specified

Large Language Models

Not specified

Multimodal 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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