Anthropic

Claude Fable 5.1 extends Claude Fable 5 for demanding reasoning and long-horizon agentic work. It supports text, image, and file inputs with text output, with adaptive thinking always on and a 1M-token context window. It is stronger at long-running agentic coding, multistep research, and document, spreadsheet, and slide work. Use it when evals on Claude Opus 5 at higher effort still fall short. It executes well-scoped tasks with few mistakes, automatically self-correcting through verification loops, and ships with robust safeguards.

Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding. It supports text, image, and file inputs with text output, with reasoning support and a 1M-token context window. It is suited for long-running, complex, and asynchronous tasks that previously required frequent human check-ins. It is particularly strong at end-to-end work that would otherwise take a person hours, days, or weeks — taking on problems that are long-running, ambiguous, or highly multi-step. It executes well-scoped tasks with few mistakes, automatically self-correcting through verification loops, and ships with robust safeguards.

Claude Opus 5.5 is Anthropic's cheaper and faster successor to Opus 5 for demanding reasoning, coding, and long-horizon agentic work. It supports text, image, and document inputs with text output. Adaptive thinking is always on, with effort levels from low through max. Context window is 1M tokens and max output is 128K.

Claude Sonnet 5.5 is Anthropic's fast frontier Sonnet for production chat, coding, and agents. It supports text, image, and document inputs with text output. Adaptive thinking is on by default, with effort levels from low through max. Context window is 1M tokens and max output is 128K.

Claude Opus 5 is Anthropic's recommended frontier model for complex agentic coding and enterprise work. It supports text, image, and document inputs with text output, adaptive thinking, tool use, and a 1M-token context window with up to 128K output tokens. It delivers top-tier reasoning, coding, and long-context performance for production agents and demanding workflows.

Claude Sonnet 5 is Anthropic's best combination of speed and intelligence — a fast frontier model for production chat, agents, coding, and multimodal work. It supports text, image, and document inputs with text output, adaptive thinking, tool use, and a 1M-token context window with up to 128K output tokens.

Anthropic's most capable generally available Opus model for complex reasoning, long-horizon agentic coding, and high-autonomy professional work. Same API pricing as Opus 4.7 ($5 / MTok input, $25 / MTok output). Supports up to 300k output tokens via Message Batches API with the output-300k-2026-03-24 beta header.

Most capable generally available model for complex reasoning and agentic coding. Features a new tokenizer (compared to previous models) that may use up to 35% more tokens for the same fixed text. Includes a step-change improvement in agentic coding over Opus 4.6. Supports up to 300k output tokens via Message Batches API with the output-300k-2026-03-24 beta header.

Flagship Claude model on Amazon Bedrock (global inference profile). Strongest tier for coding, agents, and long-running professional workflows with adaptive thinking, vision, tools, and up to 1M context.

Opus-class Claude model on Amazon Bedrock with adaptive thinking, vision, document understanding, tool use, and 1M context. Suited to complex reasoning and high-stakes agentic tasks.

Recommended Sonnet-class production model on Amazon Bedrock. Best balance of speed, intelligence, extended/adaptive thinking, vision, tools, and 1M context for coding and agentic workloads.

Sonnet 4.5 generation on Amazon Bedrock. Strong general-purpose model with extended/adaptive thinking, vision, document inputs, tool calling, and 1M context.

Fastest current Claude tier on Amazon Bedrock. Near-frontier intelligence for high-volume chat, vision, document parsing, tools, and extended thinking at low cost.