Claude 4.5 Haiku
Anthropic's fastest model with enhanced capabilities and efficiency
Claude 4.5 Haiku
Anthropic • October 2025
Training Data
Up to July 2024
Claude 4.5 Haiku
October 2025
Parameters
~30 billion
Training Method
Constitutional AI
Context Window
200,000 tokens
Knowledge Cutoff
July 2024
Key Features
Ultra Fast • Enhanced Performance • Cost Efficient
Capabilities
Speed: Outstanding
Efficiency: Outstanding
Reasoning: Excellent
What's New in This Version
Major upgrade over Claude 3.5 Haiku with improved reasoning and speed
Anthropic's fastest model with enhanced capabilities and efficiency
What's New in This Version
Major upgrade over Claude 3.5 Haiku with improved reasoning and speed
Technical Specifications
Key Features
Capabilities
Other Anthropic Models
Explore more models from Anthropic
Claude Fable 5.1
Anthropic's most intelligent generally available model, built for demanding reasoning and long-horizon agentic work that fixes root causes rather than symptoms
Claude Fable 5
Anthropic's most capable generally available Claude model for ambitious, long-running knowledge work and coding projects
Claude 3 Opus
Anthropic's most capable model with exceptional reasoning abilities
