Claude Mythos 5.1 is Anthropic's restricted-access Mythos release for approved Project Glasswing customers. Phaseo tracks the model but does not expose a public gateway route.
Claude Mythos 5 is Anthropic's limited-availability Mythos-class model and the direct successor to [Claude Mythos Preview](/anthropic/claude-mythos-preview). It is the same underlying model as [Claude Fable 5](/anthropic/claude-fable-5), but offered through Project Glasswing and related trusted-access programs with safeguards lifted in specific high-risk domains, making it Anthropic's restricted frontier track for the hardest long-horizon coding, cyber-defense, and research workflows.
Claude Haiku 5.5 is Anthropic's fastest current model, released on 2026-10-07, for high-volume, latency-sensitive tasks such as classification, extraction, and routing. It supports adaptive thinking, a 1M-token context window, and 128K-token output.
Claude Sonnet 5.5 is Anthropic's Sonnet-class model balancing speed and intelligence, released on 2026-09-28. It combines a 1M-token context window and 128K-token output limit with adaptive thinking.
Claude Opus 5.5 is Anthropic's model for long-running agentic coding and knowledge work, released on 2026-09-22. It always runs with adaptive thinking (default effort medium), and has a 1M-token context window and 128K-token output limit.
Claude Fable 5.1 is Anthropic's model for demanding reasoning and long-horizon agentic work, and the successor to [Claude Fable 5](/anthropic/claude-fable-5). It always runs with adaptive thinking (default effort high), and has a 1M-token context window and 128K-token output limit.
Claude Opus 5 is an Anthropic Opus-class model for complex reasoning, long-horizon agentic coding, and high-autonomy work, released on 2026-07-24. It has a 1M token context window and 128K max output. [Claude Opus 5.5](/anthropic/claude-opus-5.5) is its successor.
Claude Sonnet 5 is an Anthropic Sonnet-class model, released on 2026-06-30 with adaptive thinking enabled by default, a 1M-token context window, and 128k maximum output tokens. [Claude Sonnet 5.5](/anthropic/claude-sonnet-5.5) is its successor.
Claude Fable 5 is Anthropic's generally available Mythos-class model for long-horizon coding, autonomous knowledge work, and asynchronous agent workflows. It shares the same underlying model as [Claude Mythos 5](/anthropic/claude-mythos-5) but ships with safeguards for high-risk cyber, biology, and chemistry requests, for large codebases, multi-stage debugging, and end-to-end work that can run for hours or days with minimal human check-ins. [Claude Fable 5.1](/anthropic/claude-fable-5.1) is its successor.
Claude Opus 4.8 is an Anthropic Opus-class model for complex reasoning, long-horizon agentic coding, and high-autonomy work, released on 2026-05-28. It has a 1M token context window and 128K max output.
Claude Opus 4.7 is an Anthropic Opus-class model released on 2026-04-16, built for long-running, asynchronous agents. It supports up to 1M of input context for long documents, codebases, and agent workflows.
Claude Sonnet 4.6 is an Anthropic Sonnet-class model released on 2026-02-17 for coding, agents, and professional work. It supports up to 1M of input context for long documents, codebases, and agent workflows.
Claude Opus 4.6 is an Anthropic Opus-class model for coding and long-running professional tasks, released on 2026-02-05. It supports up to 1M of input context for long documents, codebases, and agent workflows.
Claude Opus 4.5 is an Anthropic Opus-class reasoning model released on 2025-11-24, optimized for complex software engineering, agentic workflows, and long-horizon computer use. It supports up to 200K of input context for long documents, codebases, and agent workflows.
Claude Haiku 4.5 is Anthropic's small, fast model, released on 2025-10-15, delivering near-frontier intelligence at a fraction of the cost and latency of larger Claude models.
Claude Mythos Preview was the preview release of Anthropic's Mythos-class model, offered through Project Glasswing ahead of general availability. [Claude Mythos 5](/anthropic/claude-mythos-5) is its direct successor.
Claude Sonnet 4.5 is an Anthropic Sonnet-class model released on 2025-09-29, optimized for real-world agents and coding workflows. It supports up to 200K of input context for long documents, codebases, and agent workflows.
Claude Opus 4.1 is an updated version of Anthropic's flagship model, offering improved performance in coding, reasoning, and agentic tasks. It supports up to 200K of input context for long documents, codebases, and agent workflows.
Claude Opus 4 is benchmarked as the world's best coding model, at time of release, bringing sustained performance on complex, long-running tasks and agent workflows.
Claude Sonnet 4 significantly enhances the capabilities of its predecessor, Sonnet 3.7, excelling in both coding and reasoning tasks with improved precision and controllability.
Claude 3.7 Sonnet was Anthropic's first hybrid reasoning model, able to respond quickly or use extended thinking. It supports up to 200K of input context for long documents, codebases, and agent workflows.
Claude 3.5 Haiku offered enhanced capabilities in speed, coding accuracy, and tool use. It supports up to 200K of input context for long documents, codebases, and agent workflows.
Claude 3.5 Sonnet (2024-10-22) was the upgraded Claude 3.5 Sonnet snapshot from Anthropic, with improved coding and tool use.
Claude 3.5 Sonnet (2024-06-20) was the first model in Anthropic's Claude 3.5 family, a Sonnet-class model for coding, vision, and agentic tasks.
Claude 3 Haiku is Anthropic's fastest and most compact model for near-instant responsiveness. Quick and accurate targeted performance. See the launch announcement and benchmark results [here](https://www.anthropic.com/news/claude-3-haiku) #multimodal.
Claude 3 Opus is a multimodal model from Anthropic that can work across text and visual inputs. It supports up to 200K of input context for long documents, codebases, and agent workflows.
Claude 3 Sonnet was the mid-tier model in Anthropic's Claude 3 family, balancing intelligence and speed. It supports up to 200K of input context for long documents, codebases, and agent workflows.
Claude 2.1 is a language model from Anthropic for chat, writing, analysis, and general-purpose automation. It supports up to 200K of input context for long documents, codebases, and agent workflows.
Claude Instant 1.2 is a language model from Anthropic for chat, writing, analysis, and general-purpose automation. It is tuned for lower latency and cost-sensitive production use.
Claude 2.0 is a language model from Anthropic for chat, writing, analysis, and general-purpose automation. It accepts text inputs and produces text outputs.
Claude 1.0 is a language model from Anthropic for chat, writing, analysis, and general-purpose automation. It accepts text inputs and produces text outputs.
Claude Instant 1.0 is a language model from Anthropic for chat, writing, analysis, and general-purpose automation. It is tuned for lower latency and cost-sensitive production use.
Claude 1.1 is a language model from Anthropic for chat, writing, analysis, and general-purpose automation. It accepts text inputs and produces text outputs.
Claude 1.2 is a language model from Anthropic for chat, writing, analysis, and general-purpose automation. It accepts text inputs and produces text outputs.
Claude 1.3 is a language model from Anthropic for chat, writing, analysis, and general-purpose automation. It accepts text inputs and produces text outputs.
Claude Instant 1.1 is a language model from Anthropic for chat, writing, analysis, and general-purpose automation. It is tuned for lower latency and cost-sensitive production use.