Desktop app 0.12.5 — An ordinary maths question could take the app down

Released 2026-08-05 · full changelog · GitHub releases

Upgrade: pip install -U rapid-mlx · brew upgrade rapid-mlx · or grab the desktop app.

A desktop-only release — the engine stays at 0.12.4, which this build bundles. Two of these shipped in front of every new user: a reply containing a formula quit the app outright, and the starter model everyone landed on fell apart on the kind of question people try first.

Maths no longer crashes the app. When a reply contained a formula the app quit with a macOS crash dialog, and a plain 2 + 2 = 4 was enough to trigger it. Formulas now render as their plain-text source rather than taking the app down; proper typesetting is still to come.
The starter model was unusable and has been replaced. The pick that shipped with 0.12.1 came apart on ordinary multi-step questions — doubling words together, then looping until it ran out of room. Measured on the same Mac against the same question: 0/4 correct before, 16/16 after, with the first answer arriving in about a second. Anyone still on the retired starter is walked back through first-run setup rather than left on it (PR #1484).
A silent server no longer hangs the chat. Sending a message used to sit there indefinitely if the model stopped responding. It now fails after a bounded wait and the message stays retryable.
Loading a model that will not fit is blocked instead of freezing the Mac. The check reads free memory at that moment and warns, rather than letting the load proceed into a freeze or a kernel panic.
Your API key is no longer shown in the clear in the copyable setup snippets on the Launch page.
Cursor no longer gets a configuration that cannot work. Cursor routes requests through its own servers, so a localhost address was never reachable from it. The app now says so and points at Claude Code, Cline, or Continue for a genuinely local connection.
Two models that could fail to answer are hidden for now. Ministral 3 and Gemma 4 E2B looked like ordinary small chat models in the picker, but on some Macs they returned no reply at all. They stay hidden until that is fixed.
Quitting no longer stalls or crashes, and launching the app no longer risks shutting down a rapid-mlx serve you started yourself in a terminal. Conversation history keeps its order, the compose box grows with what you type, and the transcript stops yanking you to the bottom while you read further up.