Anthropic Models
Safety-first AI • Constitutional AI approach
Claude 4.1 Opus
Released August 2025
Anthropic's most advanced model with enhanced capabilities and latest improvements
Claude 4 Sonnet
Released May 2025
Anthropic's next-generation balanced model with superior coding and reasoning
Claude 4 Opus
Released May 2025
Anthropic's flagship model, 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