Brief, mostly signal

Guide explains Fable 5.1 context and credit limits in Claude Code

The note covers Fable 5.1's 1 million token context and usage credits, and how to balance it with Opus 5.5. Fable is not unlimited on Pro or Max plans.

Read the source at note.com

What the research found

Note.com guide on Claude Fable 5.1 (1M token context, released Sept 1 2026) and Opus 5.5 (released Sept 22) covering usage credits and model balancing; Fable is not unlimited on Pro or Max plans.

Claims and how well the evidence supports them

Claude Fable 5.1 was released on September 1, 2026 98%
Fable 5.1 has a 1 million token context window and up to 128,000 output tokens 98%
On the $20 Pro plan, Fable is outside the flat-rate allowance and incurs extra charges 98%
Claude Opus 5.5 was released on September 22 99%

Evidence

note.com https://note.com/clauder/n/n21934f25ace7?hl=en

Actionability rated medium.