Anthropic

Claude Fable 5 is a model from Anthropic designed for demanding reasoning and long-horizon agentic work.

Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work such as long code refacto

Claude Fable 5.2 improves on Claude Fable 5.1 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work such as long code refac

Claude Haiku 5.5 is built for high-volume, latency-sensitive work such as classification, routing, extraction, and subagent tasks.

Claude Opus 4.5 is Anthropic's frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use.

Claude Opus 4.6 is a reasoning model from Anthropic, building on Opus 4.5 with enhanced performance across complex software engineering, agentic workflows, and long-horizon tasks.

Claude Opus 4.7 is a model from Anthropic for complex reasoning and agentic coding.

Claude Opus 4.8 is the successor to Opus 4.7 in Anthropic's Opus family.

Claude Opus 4.8 (Fast) is a speed-optimized variant of Claude Opus 4.8, offering the same 1M token context window and strong performance across long-horizon agentic work and comple

Claude Opus 5, the successor to Opus 4.8, delivers major gains in agentic coding, professional knowledge work, and long-horizon reasoning, with a 1M token context window, 128K max

Claude Opus 5 (Fast) is a speed-optimized variant of Claude Opus 5, offering the same 1M token context window and strong performance across agentic coding, professional knowledge w

Claude Opus 5.5 is a step-change improvement over Opus 5, with the biggest gains in agentic coding, long-running agentic tasks, and knowledge work.

Claude Opus 5.5 Fast serves the same Opus 5.5 model with faster output generation, a 1M token context window, up to 128K output tokens, adaptive thinking, vision, and tool calling.

Claude Sonnet 4.6 is Anthropic's best combination of speed and intelligence, offering strong performance on coding, reasoning, and general tasks with excellent speed and cost efficiency.

Claude Sonnet 5 follows Sonnet 4.6, substantially improving on it in coding and agentic work and reaching near-Opus quality on many tasks.

Claude Sonnet 5.5 is a step-change improvement over Sonnet 5.