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DESCRIPTION:UPDATED · September 2026 · Claude Fable 5.1, Mythos 5.1, Opus 5.5 and Sonnet 5.5
New edition: the model family is up to date, now including Sonnet 5.5 (released September 28, 2026),
with side-by-side tables for Opus 5 → 5.5 and Sonnet 5 → 5.5.
Pricing and cache windows have been revised, and the API chapter has been corrected and expanded
with the pitfalls to avoid when you switch to Sonnet 5.5. Cache reads on Fable 5.1 are 75% cheaper.
Sonnet 5.5 is more than 30% faster and up to 30% cheaper per task, at the same price as Sonnet 5.
You're using 15% of what Claude can do. This book unlocks the other 85%.
Most people open a chat, type a question, and stop there.
Meanwhile, professionals are building entire businesses on the Claude ecosystem —
Skills that turn four hours of work into four minutes, Plugins that wire Claude into Gmail and Slack,
Claude Code agents that ship production code, and MCP servers that plug Claude into any database in your stack.
The Claude AI Bible is the 428-page reference that takes you from your first chat to autonomous agents in production.
❉ L I N K: ❉