Claude Sonnet 4.6
Anthropic's default model for Claude.ai with excellent balance of capability and speed
Claude Sonnet 4.6
Anthropic • February 2026
Training Data
Up to late 2025
Claude Sonnet 4.6
February 2026
Parameters
~300 billion
Training Method
Advanced Constitutional AI
Context Window
1,000,000 tokens (beta)
Knowledge Cutoff
January 2026
Key Features
Default Claude.ai Model • 1M Context Window • Fast Response • Strong Coding
Capabilities
Reasoning: Excellent
Coding: Excellent
Speed: Outstanding
Cost: $3/$15 per M tokens
What's New in This Version
Default model for free and Pro Claude.ai users with excellent speed-capability balance
Anthropic's default model for Claude.ai with excellent balance of capability and speed
What's New in This Version
Default model for free and Pro Claude.ai users with excellent speed-capability balance
Technical Specifications
Key Features
Capabilities
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