Claude Fable 5 | Anthropic's Most Powerful Model, a New Tier Above Opus
Claude Fable 5 from Anthropic is now live on EvoLink — Anthropic's most powerful and most intelligent model, a new tier above Opus, built for the hardest coding, long-horizon agent, and high-stakes long-context work, with a 1M-token context window.
Claude Fable 5
- Model ID:
claude-fable-5 - Context window: 1M tokens
- Max output: 128K tokens
- Capabilities: state-of-the-art reasoning, advanced coding, long-horizon agentic tool orchestration, vision input
- Recommended workloads: the hardest coding tasks, longest agent runs, and highest-stakes long-context decisions where stronger reasoning is worth a premium
- Pricing: $10 / 1M input, $50 / 1M output — about 2× Opus 4.8; web search tool billed per request
- API: same surface as Opus 4.8 — adaptive thinking only (no
temperature/top_p/budget_tokens),effortup tomax; do not sendthinking: disabled(omit the parameter instead) - Routing: keep Opus 4.8 as the strong default and escalate only frontier-difficulty requests to Fable 5