Meta’s internal coding tool, Metamate, incorporates OpenAI's model alongside Meta’s own Llama model to make it more useful for developers and other Meta employees. The model has been part of Metamate since at least early this year.

Metamate is similar to other AI coding tools like Microsoft’s GitHub CoPilot or Anthropic’s Claude Sonnet, and users think it is pretty helpful. Depending on the kind of query or how an employee uses the tool, it pulls answers to coding questions or prompts from Llama or GPT-4.

Meta insiders told Fortune that Metamate was one of the better genAI things the outfit has done. they’ve done,” one of the people who used the tool said of Meta’s efforts in generative AI.

Separately, the Chan Zuckerberg Initiative (CZI), the sizeable philanthropic organisation run by Zuckerberg and his wife, Priscilla Chan, is also an OpenAI customer, two people familiar with that entity told Fortune. CZI is developing an “educational” genAI tool based on ChatGPT with some additional customisation or a “wrapper” of genAI tech. Earlier this year, Sam Altman, CEO of OpenAI, was named to a new AI advisory board at CZI.

While it’s not unusual for a company deploying genAI tools for their workforce to rely on more than one model, Zuckerberg has positioned Meta as a key player in the model wars. It’s a fight most companies are waging against OpenAI, which released ChatGPT two years ago and kicked off a race to catch up to gain a foothold in what’s widely considered a new era of tech. Zuckerberg has spent the last year marketing Llama as an “open source” alternative that’s as good or better than completely closed models, like those from OpenAI and Google.

One of the sources who spoke to Fortune agreed that the current version of Metamate, originally dubbed Code Compose, is helpful in technical work at Meta, noting it’s “at least as good as an intern.”  It can handle basic coding but not more complex engineering work.