Replit makes OpenAI its default over Anthropic, CEO says

Replit, the AI coding platform, has switched its default AI model from Anthropic to OpenAI, as announced by CEO Amjad Masad at TechCrunch Disrupt. This change comes despite recent promotions of Anthropic products, such as Claude Fable 5 and Claude Fable 5.1, on Replit's website and in blog posts, and an employee's social media post about Anthropic's Opus 5.5. The company had been actively integrating and promoting Anthropic's models in its production environment just weeks prior.

This report is the first to confirm Replit's split from Anthropic, unlike earlier reports that suggested ongoing collaboration based on recent product mentions.