The Pulse: Did Anthropic’s new model just boost rival Codex’s market share?
Anthropic's new model Fable is so restricted, it's pushing users straight to competitors.
Why it matters
Anthropic's restrictive guardrails on Fable may be creating market opportunity for rival models like Codex. This highlights the tension between safety-first design and competitive positioning in the model wars.
The key facts
10 to knowAnthropic released new model 'Fable' with user-reported restrictions
Fable's restrictions described as 'unacceptable' by users
Market shift away from Fable toward Codex and competing models
Trend emerging: smart model routing (suggests users switching between models)
Article published June 11, 2026
Anthropic released new model 'Fable'
Model has user-perceived restrictive limitations
Users migrating to competitor model Codex
Smart model routing emerging as trend
Published June 2026
Go to the source
Pragmatic Engineernewsletter.pragmaticengineer.com
Publisher excerpt: Anthropic’s new model, Fable, has restrictions many users find unacceptable. Also: a new trend of smart model routing, Coinbase’s core service has no automatic cross-zone failover, and more.