Claude Sonnet 5.5 Reviews & Ratings

Claude Sonnet 5.5

5.0 out of 5 stars

Ratings and Reviews 1 Rating

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

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What is Claude Sonnet 5.5?

Claude Sonnet 5.5 is Anthropic’s faster, lower-cost Claude 5.5 model for well-scoped professional work, software development, agentic workflows, and content creation. Anthropic positions it below Claude Opus 5.5 for the most complex open-ended work, but says it can perform comparably on some benchmarks when run at higher effort settings. The model delivers a particularly large improvement in coding, including a 70.6% result on Terminal-Bench 4.0, 46.2% on FrontierCode at Max effort, and 55.5% on CursorBench 4.0. It also scores 1844 on GDPval-AA, 1811 on AA-Briefcase, 64.5% on Humanity’s Last Exam with tools, and 80.1% on OSWorld 2.1 partial. Anthropic reports that Sonnet 5.5 is better at long-horizon work, image understanding, collaboration, and codebase comprehension than Sonnet 5. The company also highlights design-oriented improvements, including the ability to produce polished documents, spreadsheets, slides, and user interfaces with less editing. Sonnet 5.5 generates output more than 30% faster than its predecessor and is Anthropic’s fastest Sonnet model to date. Although its listed token prices are unchanged from Sonnet 5, Anthropic says greater token efficiency can reduce per-task cost by up to 30%. Pricing is $2 per million input tokens, $10 per million output tokens, $2.50 per million cache-write tokens, and $0.20 per million cache-read tokens. The model includes cyber safeguards, biology safeguards, reasoning-extraction protections, and preserved-thinking controls, with some higher-risk cyber requests falling back to Sonnet 5. Claude Sonnet 5.5 is available with zero data retention across Claude products, the Claude Platform, AWS, Google Cloud, and Microsoft Azure under the model name claude-sonnet-5-5.

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.

Media

Media

Integrations Supported

Augment Code
C
Claude Desktop
Claude Security
Claw Code
Dessix
Elixir
Emergent
Node.js
OpenTag
Oxen.ai
PrivatClaw
PyCharm
React
Rider
Scalestack
Thread Deck
TypeScript
XML
YAML

Integrations Supported

Augment Code
C
Claude Desktop
Claude Security
Claw Code
Dessix
Elixir
Emergent
Node.js
OpenTag
Oxen.ai
PrivatClaw
PyCharm
React
Rider
Scalestack
Thread Deck
TypeScript
XML
YAML

API Availability

Has API

API Availability

Has API

Pricing Information

$2 per 1M tokens (input)
$2 per million input tokens and $10 per million output tokens.

Cache reads, which account for most costs in agentic and coding workloads, are priced at just $0.10 per million tokens

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

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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