2 min lesson
Base-model selection is itself a research decision
Respond to "Why is choosing a strong open MoE base for Composer 2 (rather than pretraining from scratch) consistent with the role's compute-efficiency bet?" Name the reason and the detail behind it.
Step 1 of 2
Base-model selection is itself a research decision. Picking a strong open MoE and applying continued pretraining plus RL is a compute-efficiency play: you spend FLOPs where they buy the most product quality instead of re-learning what a good base already knows.
Compile 2026 updates the model story: Composer 2.5The current Composer release, better at long-running tasks and at judging when a job needs a light touch versus deep work. Press Enter for the full definition. is the available model step to study now, while Cursor says it is training a significantly larger model from scratch with SpaceX using 10x more total compute. In an interview, keep those two facts separate: shipped capability versus future training direction.
The fourth bet from the JD shows up physically as infrastructure - the stack's bottom three layers above.
The ComposerCursor's own fast coding model, tuned for the editor and priced well below frontier models; the recommended day-to-day model for executing a plan. Press Enter for the full definition. reports and the Cursor TabCursor's original autocomplete: multi-line, edit-aware suggestions you accept with the Tab key. Press Enter for the full definition. online-RL blog post are the most impactful prep you can do. Reading them lets you reason from what the team actually did - base selection, sandbox infra, online RL on Tab - instead of generic RL theory. Cite a specific choice and ask a sharp question about it and you signal you'd fit the actual work.
Don't overstate exact numbers you can't source. It's stronger to say “Composer 2Cursor's own coding model, built on the open Kimi K2.5 base as a software-engineering specialist. Cursor calls it frontier-level at coding and more cost-efficient than comparable models; Composer 2.5 has since replaced it in Cursor's model list. Press Enter for the full definition. was reported to train on top of an open ~1T-param MoE base” and “Cursor says a larger from-scratch model is in training” than to assert a future model is already available. The team is full of truth-seekers; confident wrongness costs you more than a calibrated hedge.