Cursor ships Grok 4.5, a frontier MoE co-trained with SpaceXAI, into its coding agent

Cursor Release Notes (Releasebot)·low signal

Cursor rolled out Grok 4.5 (July 8), the frontier mixture-of-experts model it trained jointly with SpaceXAI, as a selectable model inside its agentic coding harness. It arrived the same day as Cognition's SWE-1.7 and OpenAI's model drop, underscoring how model releases and coding-agent product releases have collapsed into a single competitive cadence. For builders, model choice inside a fixed harness is now a primary lever on cost and quality.