Releases

Anthropic released Claude Haiku 5.5, its fastest and most capable small model for high-volume, cost-sensitive workloads. Anthropic says it costs about 75% less per task on average than Haiku 4.5, supports adjustable effort, and is available across the Claude Platform, AWS, Google Cloud, and Microsoft Azure.

Anthropic released Claude Sonnet 5.5 as a faster, lower-cost upgrade to Sonnet 5 for everyday tasks, coding, and document work.

Anthropic released Claude Opus 5.5, the first model in the Claude 5.5 family, with higher capability and lower operating cost than Opus 5.

Anthropic released Claude Fable 5.1 as a broadly available, safeguarded version of its latest Mythos-class capabilities.

Anthropic released Claude Mythos 5.1 to vetted cyberdefenders and life-sciences organizations through trusted-access programs.

Anthropic updated Claude Fable 5's biology safeguards as part of its safety work for high-capability models.

Anthropic released Claude Opus 5 with improvements in coding, long-running agents, professional work, and scientific reasoning.

Anthropic restored global access to Fable 5 and resumed restricted access to Mythos 5 after the relevant export controls were lifted.

Anthropic released Claude Sonnet 5 as an upgrade to Sonnet 4.6 for agentic work, coding, and professional tasks.

Anthropic suspended access to Claude Fable 5 and Mythos 5 after a US government export-control directive concerning model safeguards.

Anthropic released Claude Mythos 5 to a limited set of vetted cybersecurity partners through trusted-access programs.

Anthropic released Claude Fable 5, a Mythos-class model adapted with safeguards for general use across Claude products and the API.

Anthropic released Claude Opus 4.8 with stronger coding, agentic, computer-use, and professional-work capabilities plus dynamic workflows in Claude Code.

Anthropic released Claude Opus 4.7 with improved software engineering, vision, complex multi-step work, and new cybersecurity safeguards.

Anthropic released Claude Mythos Preview as a gated frontier model for vetted Project Glasswing partners, focusing its advanced cybersecurity capabilities on defensive use.

Anthropic released Claude Sonnet 4.6 with upgrades across coding, computer use, long-context reasoning, agent planning, knowledge work, and design.

Anthropic released Claude Opus 4.6 with stronger coding, longer-running agentic work, improved knowledge work, and a one-million-token context window in beta.

Anthropic released Claude Opus 4.5 for coding, agents, computer use, research, and professional work.

Anthropic released Claude Haiku 4.5, offering near-frontier coding performance at lower cost and latency.

Anthropic released Claude Sonnet 4.5 with major gains in coding, computer use, agents, reasoning, and mathematics.

Anthropic released Claude Opus 4.1 with improvements to agentic tasks, coding, and reasoning.

Anthropic released Claude Opus 4 and Claude Sonnet 4 for coding, advanced reasoning, and agent workflows.

Anthropic released Claude 3.7 Sonnet, its first hybrid reasoning model with standard and extended-thinking modes.

Anthropic released Claude 3.5 Haiku as a faster model with substantially improved intelligence and coding performance.

Anthropic released an upgraded Claude 3.5 Sonnet with major coding and tool-use improvements.

Anthropic released Claude 3.5 Sonnet with stronger reasoning, coding, writing, and vision performance.

Anthropic released Claude 3 Haiku as the fastest and least expensive model in the Claude 3 family.

Claude 3 Opus and Claude 3 Sonnet became available on Claude.ai and the generally available Claude API.

Anthropic announced Claude 3 Opus, Sonnet, and Haiku, adding multimodal image understanding and a three-tier capability lineup.

Anthropic released Claude 2.1 with a 200K-token context window, lower hallucination rates, system prompts, and beta tool use.

Anthropic released Claude Instant 1.2 through its API with gains in reasoning, coding, multilingual performance, and safety.

Anthropic released Claude 2 with improved reasoning, coding, safety, and long-context capabilities.

Anthropic introduced Claude and Claude Instant more broadly after a closed alpha with partners.