How do you choose a default AI coding model after Replit made OpenAI its default?

Replit — once one of Anthropic's biggest customers — has made OpenAI the default model in its app builder, citing cost, partnership and its own benchmarks. The decision is a field guide for any team: a default quietly decides your bill, your latency and your code quality, so test on your own code before you commit.

Most people never change a default — which is exactly why the moment a platform picks one for you is worth paying attention to. Short answer: Replit has made OpenAI’s models the default in its app-building agent, ending its run as one of Anthropic’s biggest customers. CEO Amjad Masad told TechCrunch Disrupt the switch came down to cost, partnership and performance — and afterwards clarified that Replit stays model-agnostic: Claude is still available, but OpenAI is now the preferred partner and the default most users will get.

Why the default matters: it quietly sets three things on every project — what each finished task costs, how long you wait for answers, and how good the first draft of your code is. In Replit’s own benchmarks, Masad said, OpenAI’s current Sol and Astra models built apps from scratch better than the alternatives. Your mileage will differ, because vendor benchmarks run on the vendor’s favourite tasks, not yours — which is why the choice deserves a test instead of a shrug.1.

Pick three to five real tasks from your own backlog — a bug fix, a small feature, a refactor — not demo prompts.2. Run the same tasks through both models with identical instructions, then score the results blind: does it run, does it pass your tests, how much cleanup did it need?3. Price the finished task, not the token.

A cheaper model that needs three retries and an hour of your fixes costs more than a pricier one that lands it first try.4. Check latency where it hurts. Interactive coding punishes slow models; batch jobs forgive them.

Match the default to how your team actually works.5. Keep the exit open. Note what would break if you switched providers — prompts, tooling, integrations — and keep that list short by design.Pro tip: Do not lock into one provider out of habit.

Models leapfrog each other every few months, so re-run your little benchmark whenever a major release lands and let the default be re-earned.Ad’s take: Replit’s public reasoning is the useful part: cost, partnership, measured performance. Run the same three tests on your own code and you will never choose a model by vibes again.