Fable is Opus, Opus is Sonnet, etc?
Summary
Suggests that Anthropic's Fable model is equivalent to Opus, and Opus to Sonnet, possibly indicating a rebranding or restructuring of model tiers.
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Making Fable Cheaper Than Opus (12 minute read)
Cognition replaced the Opus model with Fable in Devin's Fusion architecture, achieving higher performance at lower cost despite Fable's higher per-token price, through better delegation and reduced lead model turns.
Fable 5 will divert coding to Opus 4.8 according to Anthropic
According to Anthropic, Fable 5 development will shift to using the Opus 4.8 AI model for coding tasks.
@kevinwhinnery: More to come on this topic - Fable Sonnet.
Kevin Whinnery teases an upcoming integration between Fable and Sonnet, with Brad Abrams noting Fable is back and suggesting Sonnet 5 handles loops while Fable takes hard calls.
@diegocabezas01: Use Fable 5 as orchestrator and Opus + Codex to execute (to save fable usage): Fable 5 (max reasoning) = orchestrator O…
A tweet thread explaining how to configure Fable 5 as the orchestrator with Opus and Sonnet as subagents, plus Codex as a peer engineer, in Claude Code to optimize model usage and task delegation.
Opus 5 isn't much cheaper than Fable to use
Opus 5 is not significantly cheaper to use than Fable.