# Claude Fable 5.1

> A Claude model Anthropic lists as its most capable for long, careful work.

- Maker: Anthropic (https://docs.anthropic.com/en/docs/about-claude/models)
- Type: Reasoning
- Artificial Analysis Intelligence Index: 50 (xhigh setting)
- Context window: 1M
- Output speed: 64 tokens a second
- Scores checked 30 October 2026 at https://artificialanalysis.ai/leaderboards/models

## Where to use it through an API

- Anthropic: model id `claude-fable-5-1`, most capable

## Use it with every other AI at once

MultiScreenAI (https://www.multiscreenai.com) puts Claude Fable 5.1 on one screen next to ChatGPT, Claude, Gemini and 300+ models: one message goes to every panel, and a timed, blind test mode shows which answers best. Free during the beta with your own API keys.
AI agents and coding harnesses (Claude Code, Codex, Cursor, Gemini CLI) can ask Claude Fable 5.1 and other models at once through the MCP server at https://www.multiscreenai.com/api/mcp/ai; setup: https://www.multiscreenai.com/mcp