Claude Fable 5.2 is live
Claude Fable 5.2 on BetterToken: exact Model ID claude-fable-5-2 for complex coding, research, document analysis and long-running agents.
Official release date: 2026-11-09
Claude Fable 5.2 is available on BetterToken as claude-fable-5-2. Anthropic designed the model for demanding reasoning and long-running agent tasks.
When to use it
- Complex coding: changes across large codebases and multistep engineering tasks.
- Research and documents: analyze source material and produce a finished document.
- Long-running agents: work that requires context across many steps.
Official specifications
Anthropic lists these model specifications:
| Item | Value |
|---|---|
| Context window | 1M tokens |
| Maximum output | 128K tokens |
| Input → output | Text and images → text |
| Thinking | Adaptive, always on |
Get started
- Create a BetterToken API Key or use your existing key.
- For Claude Code or Anthropic Messages, set Base URL to
https://bettertoken.ai. - Set Model ID to
claude-fable-5-2. - Run a representative task and check output and token usage before switching production traffic.
For OpenAI-compatible Chat Completions, use Base URL https://bettertoken.ai/v1 and endpoint /v1/chat/completions. Keep Model ID claude-fable-5-2.
Move from Fable 5.1
Change the Model ID to claude-fable-5-2 and run your existing evaluations. Adaptive thinking is always on; do not carry over settings that disable it.
Pricing and caching
Check the model plaza for input, output, cache-read, 5-minute cache-write and 1-hour cache-write rates. Use prices for your account currency.
