Claude Haiku 5.5 Reviews & Ratings

Claude Haiku 5.5

5.0 out of 5 stars
Claude Fable 5.2 Reviews & Ratings

Claude Fable 5.2

5.0 out of 5 stars

Ratings and Reviews 1 Rating

Total 5 out of 5 stars
features 4 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 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.

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

BLACKBOX AI
Bolt.new
C
CSS
Claude Agent SDK
Claude Duet
GitHub Copilot
Hermes Agent
JetBrains Junie
Model Context Protocol (MCP)
Objective-C
Revise
SQL
Scalestack
Simtheory
Sup AI
Thread Deck
Trinity-Large-Thinking
WebStorm
Zo Computer

Integrations Supported

BLACKBOX AI
Bolt.new
C
CSS
Claude Agent SDK
Claude Duet
GitHub Copilot
Hermes Agent
JetBrains Junie
Model Context Protocol (MCP)
Objective-C
Revise
SQL
Scalestack
Simtheory
Sup AI
Thread Deck
Trinity-Large-Thinking
WebStorm
Zo Computer

API Availability

Has API

API Availability

Has API

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.

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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