Claude

Anthropic's flagship Claude Fable model, released on 1 September 2026. A frontier model for demanding reasoning, coding, research and long-running agents; 1M-token context, multimodal input, proprietary access via API and the Claude apps.

Claude Haiku 4.5 is Anthropics fast compact model from October 2025 — it delivers near-Sonnet-4 performance at roughly one third of the cost and is the first Haiku model with reasoning.

Claude Mythos 5.1 (September 2026) is Anthropics frontier model for vetted cyber and life-science organizations — the same model as Fable 5.1, only with more permissive safeguards.

Anthropic's flagship Claude Opus model, released on 24 July 2026. Positioned as a powerful everyday model for knowledge work, coding and agents; proprietary access via the Claude apps and API (model ID claude-opus-5).

Claude Sonnet 5 is Anthropic's mid-tier model from June 30, 2026 — the most agentic Sonnet yet, with performance close to Opus 4.8 at $2 input and $10 output per 1M tokens.

Claude Sonnet 5.5 (September 28, 2026) is Anthropic's low-cost mid-tier model — a faster, cheaper companion to Opus 5.5, priced at $2/$10 per 1M tokens and leading on Terminal-Bench 4.0. Available via boostN.

Claude Fable 5 is Anthropics first publicly available Mythos-class model, released in June 2026. It is built for the most demanding reasoning and long-horizon agentic work and offers a one-million-token context window.

Claude Opus 4.8 is the flagship model of Anthropics Opus line, released in May 2026. It targets agentic coding, complex reasoning and computer use, and is described as an incremental but measurable improvement over Opus 4.7.

Claude Sonnet 4.5 (September 2025) is Anthropics Sonnet-line model tuned for agents and coding — leading on SWE-bench Verified at launch, since superseded by newer Sonnet versions.

Claude Sonnet 4.6 is Anthropics mid-tier model from February 2026 — close to Opus-level performance, with a 1M-token context and unchanged Sonnet pricing of 3/15 USD per million tokens.

Claude Mythos (April 2026) is Anthropic's most powerful model to date — a new tier above the Opus line, distributed primarily through the Glasswing program to cybersecurity defenders.

Claude Mythos 5 (June 9, 2026) is Anthropic's most powerful model line above Opus — technically identical to Fable 5 but without its safety classifiers, distributed through Project Glasswing.

Claude Opus 4.5 is Anthropic's top-tier model from November 2025 — the direct predecessor of Opus 4.6, bringing "Infinite Chats" and substantially reduced token usage.

Claude Opus 4.6 is Anthropic's flagship model from February 2026 — top tier of the Claude 4 family with a 1M-token context window, stronger coding and new effort controls.

Claude Opus 4.7 is Anthropic's top-tier model from April 2026 — successor to Opus 4.6 with high-resolution image processing, a new xhigh effort level and task budgets for long agentic runs.