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Saber Says No Writers Were Replaced by AI on Rideshare 'Stimulator' — Former Lead Writer Disagrees

CEO Matthew Karch denies AI took over scripting duties on the upcoming driving game, but the game's former lead writer tells a very different story.

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By David, AI Engineer · Aug 12, 2026

A public dispute has broken out over how much artificial intelligence actually contributed to Rideshare "Stimulator," the driving sim Saber Interactive announced last month through developer Unigine. Saber CEO Matthew Karch pushed back on claims that AI tools replaced human writers, stating flatly that "neither Saber nor Unigine have replaced any writers with AI" on the project.

That statement directly contradicts what Stella Sacco, who says she was the game's lead writer, posted on Bluesky. According to Sacco, she was pulled off the project partway through development and replaced by ChatGPT-generated writing, and every passenger voice line in the game was AI-generated as well. She suggested that Saber either changed its approach after her departure or simply isn't disclosing AI involvement on the game's Steam page.

Saber markets Rideshare "Stimulator" as an immersive driving experience where players work as a rideshare driver, ferrying passengers around and presumably reacting to whatever dialogue those passengers throw at them. Whether that dialogue was written by a person, a chatbot, or some mix of both is now the crux of the disagreement, and neither side has offered documentation to settle it.

Why it matters: Steam and most storefronts still don't require granular disclosure of where AI was used in a game's content pipeline, so disputes like this one largely come down to he-said-she-said accounts from people involved. As AI writing and voice tools get cheaper and more capable, expect more of these public callouts from displaced writers, and more pressure on platforms to require clearer AI-use labeling before launch.

Sources: The Verge

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