Anthropic Models
Safety-first AI • Constitutional AI approach
Claude Opus 4.5
Released November 2025
Anthropic's most powerful frontier model with exceptional reasoning, coding, and scientific capabilities
Claude 4.5 Haiku
Released October 2025
Anthropic's fastest model with enhanced capabilities and efficiency
Claude Sonnet 4.5
Released September 2025
Anthropic's most capable model with breakthrough performance across all tasks
Claude 4.1 Opus
Released August 2025
Anthropic's most advanced model with enhanced capabilities
Claude 4 Sonnet
Released May 2025
Anthropic's next-generation balanced model with superior coding and reasoning
Claude 4 Opus
Released May 2025
World's best coding model with multi-hour agentic workflows
Claude 3.5 Haiku
Released October 2024
Anthropic's fastest and most cost-effective Claude 3.5 model
Claude 3.5 Sonnet
Released June 2024
Anthropic's enhanced Claude 3.5 with improved reasoning and coding
Claude 3 Opus
Released March 2024
Anthropic's most capable model with exceptional reasoning abilities
Claude 3 Sonnet
Released March 2024
Anthropic's balanced model offering strong performance and speed
Claude 3 Haiku
Released March 2024
Anthropic's fastest model optimized for speed and efficiency
Claude Instant
Released August 2023
Anthropic's previous generation fast model
Claude 2
Released July 2023
Previous generation Claude with strong safety focus