Claude Fable 5
Claude Fable 5 is an AI model developed by Anthropic designed for autonomous knowledge work and coding tasks. It features a one-million-token context window and supports inputs including text, images, and files, while incorporating advanced reasoning and tool-calling capabilities.
Claude Fable 5 specs and pricing
- Provider: Anthropic
- Released: June 9, 2026
- Context window: 1M tokens
- Max output: 128K tokens
- Input: text, images, files
- Output: text
- Price: $10 input / $50 output per 1M tokens
- Reasoning: yes
- Tool calling: yes
What Claude Fable 5 is good at
- Analyzing large sets of documents and files
- Complex coding and software development projects
- Tasks requiring multi-step reasoning
To-dos to try with Claude Fable 5
- Upload a full technical manual and ask the model to summarize key safety protocols
- Provide a codebase and ask the model to identify and suggest fixes for potential bugs
- Upload multiple project documents and ask the model to synthesize them into a single status report
FAQ
- What types of input can Claude Fable 5 process? This model accepts text, images, and various file types as input.
- What is the primary purpose of Claude Fable 5? It is a Mythos-class model built specifically for autonomous knowledge work and coding.
- How much does Claude Fable 5 cost? Claude Fable 5 costs $10 per million input tokens and $50 per million output tokens through OpenRouter. In todo.is a typical agent step costs about 35 credits ($1 = 100 credits).
- What is the context window of Claude Fable 5? Claude Fable 5 can read up to 1M tokens at once and write up to 128K tokens in one reply.
- Can I use Claude Fable 5 without coding? Yes. In todo.is you pick Claude Fable 5 as your agent's model and write to-dos in plain words, on the web, the Android app, WhatsApp or Telegram. No API key needed: credits are included, or you can bring your own key.
JavaScript is required to use the todo.is app.