Claude Code error mentions 'Fable 5.1' and 'Opus 5', hinting at unreleased models
adonis_singh · x · 2026-10-15
A Claude Code error screenshot reads: "Couldn't switch to Fable 5.1. Claude Code couldn't reach the API to confirm the model... Still using Opus 5."
If genuine, this suggests Claude Code may already reference an internal model named Fable 5.1, with the current fallback called Opus 5 — neither an official public Anthropic naming. The poster cautions it "could be one off bug though." Unverified — treat as a rumor.
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