The Breakup

Real talk: the AI space is moving at breakneck speed, and it’s giving major drama. Amjad Masad, the CEO and co-founder of the AI coding platform Replit, just dropped a bombshell at TechCrunch Disrupt: the company is officially no longer working with Anthropic.

For a while, Replit leaned heavily on Anthropic’s Claude models to power its browser-based development platform, a partnership that allegedly helped them scale up big time. But according to Masad, that chapter is officially closed.

Why the pivot?

It’s not just one thing; the vibes were off on a few fronts. Masad cited cost, the general quality of the partnership, and raw performance metrics as the main drivers. “I think ChatGPT is better now,” Masad stated onstage. He claimed that Replit’s internal benchmarks—which they also publish publicly—show that OpenAI’s Sol and Astra models are simply better at handling "vibe-coded" apps built from scratch.

However, the plot thickens. While Masad is confident in the split, sources familiar with the deal are pushing back, claiming the partnership is still active. There’s also the fact that Replit’s own blog posts from as recently as September were still highlighting Anthropic’s Claude Fable models in their production environment. It’s highkey messy.

The Big Picture

Beyond the partnership drama, Replit is clearly leveling up their business model. Masad noted that enterprise contracts have jumped from 2% of their revenue last year to 15% today, with over half of their total revenue now coming from B2B.

He also dropped a nerdy analogy about AI safety, comparing the tech to a human office environment. Just like we need AC and good coffee to be productive, AI agents need a “habitat”—think solid security, sandboxing, and identity authorization—to actually get work done without breaking things.

Why it matters

This is a classic case of "it's not you, it's the cost and performance." For developers who rely on Replit, it’s a reminder that these platforms are constantly swapping their "brains" behind the scenes. If you’re building on these tools, it’s worth paying attention to what’s under the hood, because the tech stack you’re using today might look totally different by next month.