Saber Denies Replacing Rideshare Stimulator's Writers with ChatGPT

Saber Interactive CEO Matthew Karch went on record August 11, 2026 to deny that the studio or its development partner Unigine replaced any writers with ChatGPT on their upcoming driving game, Rideshare Stimulator — a denial complicated by the fact that Karch simultaneously confirmed AI does generate dialogue in one of the game's modes. Former lead writer Stella Sacco had already said publicly that she was cut from the project in December 2023 and told AI was the reason.

Background You Need

Rideshare Stimulator, announced by Saber last month, casts players as rideshare business owners navigating a stream of passenger interactions. The game is developed by Unigine, a studio Saber works with, and Saber is handling the publishing side. The premise sets up an obvious design challenge: if a player-run rideshare operation can theoretically serve an unlimited number of passengers, each with their own voiced dialogue, the volume of writing and voice acting required at human rates becomes enormous. That scaling problem is exactly the context in which Karch would later frame the studio's use of AI — though the framing arrived only after a public accusation forced the conversation.

The dispute surfaced when Sacco posted to Bluesky describing her departure from the project. By her account, she was serving as lead writer before being let go partway through development, and the explanation she received at the time was explicit: AI would be taking over her role. The teaser trailer for the game, which includes passenger voice interactions that multiple observers flagged as sounding machine-generated, gave her account immediate visual support. Saber's Steam listing for the title carried no AI content disclosure, an absence that drew its own criticism once the allegations were public.

The gaming industry has been circling this particular argument for two years. Studios have broadly adopted generative AI for internal tasks — localization, asset ideation, placeholder text — while remaining publicly cautious about describing any of it as a replacement for human creative labor. The Saber situation is notable because the accusation came from a named writer who had a direct employment relationship with the project, not from an anonymous tip or a metadata analysis.

What's New

Karch's statement to The Verge is precise in its phrasing: neither Saber nor Unigine replaced any writers with AI on Rideshare Stimulator. He added that the game's main story was written entirely by human writers, a claim that multiple outlets picked up as the headline denial. AI Daily Post confirmed that framing directly, noting that Karch's pushback was specifically tied to the game's narrative backbone — the scripted story content that players experience on a structured path through the game.

Where the statement gets complicated is in what follows. Karch acknowledged that an experimental free-ride mode — the open-ended part of the game where players pick up an essentially unlimited stream of passengers — does use AI to generate dialogue. His stated justification was scale: the passenger count in that mode is effectively infinite, and having human writers generate unique conversation for every possible rider would not be practically achievable. The AI Chronicle's coverage corroborates this, noting that Karch framed the AI usage as a necessity born from the game's design, not a cost-cutting substitution.

Sacco's response to that reasoning, as reported by The Verge, was pointed. She argued that you cannot claim no writers were replaced by AI and simultaneously confirm that AI is producing content in a mode that would otherwise require writers. Her position is that those two statements describe the same displacement, regardless of which mode the displaced writing would have appeared in. The semantic gap between "we did not replace a writer" and "AI generates the dialogue in this section a writer would otherwise have written" is thin enough that most readers will not find it convincing.

The Steam listing remains the unresolved procedural problem. As of publication, Rideshare Stimulator's store page contains no disclosure that any portion of its content was AI-generated. There is currently no platform-level mandate on Steam requiring AI content disclosure, which means Saber is not in regulatory violation — but the absence stands as its own kind of answer to the question of whether the studio anticipated public scrutiny on this point.

Saber also made a broader claim: that none of its more than 3,000 employees will be replaced by AI. That number, confirmed by The AI Chronicle, positions the denial as company-wide policy rather than a one-off explanation for a single project. Whether that commitment is enforceable, or how it squares with contracting relationships like the one Sacco had, the studio did not address.

The Pushback

Our read is that the "infinite passengers" argument is going to become a standard rhetorical tool in this debate, and the Saber case is where it debuts as a named justification. The logic runs: AI-generated content is not labor replacement when the volume of content exceeds what any human team could produce. It's a structurally different claim from "AI is cheaper" or "AI is faster," and it's harder to immediately refute — but it also creates a template that any studio with a procedurally generated or open-world game can apply to almost any content department. Once that framing is normalized, the question of when AI content is "necessary" versus merely convenient becomes very difficult to adjudicate from the outside.

The disclosure gap is the sharpest unresolved issue. PC Gamer's coverage specifically flags that the voiced passenger segments in the trailer appear to use AI-generated audio, and that none of this appears on the store listing. Multiple sources confirm that Steam has no current disclosure requirement, which places the entire burden of transparency on studio goodwill. Sacco's account suggests that goodwill was not present when it mattered — in December 2023, when she says she was told AI was replacing her before any public conversation about the game's AI usage had occurred. The CEO's denial came in August 2026, after a trailer, a Bluesky post, and several days of coverage. That sequencing is worth noting.

Sources

The Verge The AI Chronicle PC Gamer AI Daily Post