OpenAI's Decisions API Is Now Live for Everyone — and It Was Built to Catch a Startup
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According to Masad, OpenAI is now Replit's "preferred partner for powering Replit Agent, based on performance, economics, and the strength of our partnership." Anthropic's Claude models are still selectable inside Replit Agent, and Masad insists "Replit remains model agnostic." But the default slot — the one most users never touch — now belongs to ChatGPT.
Masad gave three reasons: cost, partnership, and performance. On cost, he was blunt, writing on X on October 17 that "OpenAI models are generally more affordable." On performance, he said Replit's internal VBench benchmark plus a public benchmark show OpenAI's GPT-6 Sol and Astra models "perform better on building vibe-coded applications from scratch." His summary: "I think ChatGPT is better now."
A person familiar with the relationship disputed that it ended, saying the partnership is still in place — and the paper trail backs up a softer landing. A late-September Replit blog listed Claude Fable 5 and 5.1 in production, and the October 16 changelog added Claude Haiku 5.5 in Power Mode for Core and Pro users. The accurate summary: OpenAI won the default slot and the "preferred partner" title; Claude stays on the menu.
Replit was, until recently, one of Anthropic's top-five customers. Since most users never change the default model, this switch could significantly cut Replit's spending with Anthropic — and redirect it to OpenAI. In the model wars, defaults are destiny: whoever owns the default owns the usage, the spend, and the feedback loop. Replit announced its OpenAI partnership back in August 2026, but nothing public had suggested the Anthropic relationship was ending, which makes the abruptness of this move its own signal.
This is less a breakup than a demotion with very expensive consequences. Anthropic keeps a seat at the table, but OpenAI now sets the menu — and in AI coding, the default model is the product
Anthropic just gave Claude two new models
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