Claude Fable 5 — reviews, specs & pricing
Anthropic's most capable widely released model, built for long-running agents. 1M-token context, 128k max output, always-on adaptive thinking. $10/$50 per 1M tokens.
Summary
Claude Fable 5 is Anthropic's premier model designed to power highly sophisticated, autonomous, long-running agents. It features a massive 1M-token context window, an unprecedented 128k maximum output, and always-on adaptive thinking for deep problem-solving. This makes it a formidable tool for complex programming, analysis, and conversational workflows.
Sample use case
An enterprise development team can use Claude Fable 5 to automate the refactoring of a massive legacy codebase. By ingesting the entire repository within its 1M-token context window, the model can autonomously identify structural inefficiencies, map out dependencies, and generate thousands of lines of updated, production-ready code in a single 128k output run.
Specifications
- Provider: anthropic
- License: closed
- Context: 1000k tokens
- Input price: $10/M tok
- Output price: $50/M tok
- Released: 2026-06-09
Pros
- Massive 1M-token context window
- Unprecedented 128k maximum output
- Always-on adaptive thinking
- Optimized for autonomous agents
Cons
- Premium pricing at $10/$50 per 1M tokens
- Higher latency during complex reasoning
- Inefficient for simple query-response tasks
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