Company•active

Anthropic

Anthropic is an AI research and product company that develops Claude models, the Claude API, and products including Claude Code.

Official siteVerified Oct 3, 2026

Model families

Models

APIs

Tools

Agents

Company details

Type: Private
Founded: —
Founders: —
Headquarters: —

Model families

Model Familyactive

Claude 5.5

Claude 5.5 is an Anthropic model family represented in iilib by Claude Sonnet 5.5 and Claude Opus 5.5.

Models

Modelactive

Claude Fable 5.1

Claude Fable 5.1 is an Anthropic model for demanding reasoning and long-horizon agentic work, with a one-million-token context window and up to 128K output tokens.

Modelactive

Claude Opus 5.5

Claude Opus 5.5 is Anthropic's current Opus model for long-running agentic coding and knowledge work, with a 1M-token context window.

Modelactive

Claude Sonnet 5.5

Claude Sonnet 5.5 is an Anthropic model released in September 2026 with a one-million-token context window, text and image input, and text output.

APIs

APIactive

Claude API

Claude API is Anthropic's REST API for programmatic access to Claude models, including Messages, streaming, tool use, files, model listing, and related platform features.

Tools and agents

Agentactive

Claude Code

Claude Code is Anthropic's coding agent for working directly with a codebase from the terminal, supported IDEs, the web, GitHub, Slack, and other product surfaces.