Anthropic Models

Safety-first AI • Constitutional AI approach

13 Models Latest: Claude Opus 4.5

Claude Opus 4.5

Released November 2025

LATEST

Anthropic's most powerful frontier model with exceptional reasoning, coding, and scientific capabilities

Parameters
~600 billion
Context
200,000 tokens
Key Features
Most Powerful Frontier Model Exceptional Reasoning Scientific Excellence +1 more
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Claude 4.5 Haiku

Released October 2025

LATEST

Anthropic's fastest model with enhanced capabilities and efficiency

Parameters
~30 billion
Context
200,000 tokens
Key Features
Ultra Fast Enhanced Performance Cost Efficient
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Claude Sonnet 4.5

Released September 2025

LATEST

Anthropic's most capable model with breakthrough performance across all tasks

Parameters
~300 billion
Context
200,000 tokens
Key Features
State-of-the-art Performance Advanced Reasoning Superior Coding
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Claude 4.1 Opus

Released August 2025

Anthropic's most advanced model with enhanced capabilities

Parameters
~500 billion
Context
200,000 tokens
Key Features
Latest Improvements Enhanced Performance Advanced Reasoning
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Claude 4 Sonnet

Released May 2025

Anthropic's next-generation balanced model with superior coding and reasoning

Parameters
~300 billion
Context
200,000 tokens
Key Features
Advanced Reasoning Superior Coding Hybrid Modes
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Claude 4 Opus

Released May 2025

World's best coding model with multi-hour agentic workflows

Parameters
~500 billion
Context
200,000 tokens
Key Features
World's Best Coding Multi-hour Workflows Extended Thinking
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Claude 3.5 Haiku

Released October 2024

Anthropic's fastest and most cost-effective Claude 3.5 model

Parameters
~25 billion
Context
200,000 tokens
Key Features
Ultra Fast Cost Effective Enhanced Performance
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Claude 3.5 Sonnet

Released June 2024

Anthropic's enhanced Claude 3.5 with improved reasoning and coding

Parameters
~200 billion
Context
200,000 tokens
Key Features
Advanced Reasoning Enhanced Coding Multimodal
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Claude 3 Opus

Released March 2024

Anthropic's most capable model with exceptional reasoning abilities

Parameters
~175 billion
Context
200,000 tokens
Key Features
Multimodal Long Context Safety Focus
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Claude 3 Sonnet

Released March 2024

Anthropic's balanced model offering strong performance and speed

Parameters
~100 billion
Context
200,000 tokens
Key Features
Multimodal Fast Response Balanced Performance
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Claude 3 Haiku

Released March 2024

Anthropic's fastest model optimized for speed and efficiency

Parameters
~25 billion
Context
200,000 tokens
Key Features
Ultra Fast Cost Effective Near-instant Response
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Claude Instant

Released August 2023

Anthropic's previous generation fast model

Parameters
~12 billion
Context
100,000 tokens
Key Features
Fast Response Cost Effective Good Performance
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Claude 2

Released July 2023

Previous generation Claude with strong safety focus

Parameters
~52 billion
Context
100,000 tokens
Key Features
Long Context Safety Focused Helpful Assistant
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