SpaceXAI launches Grok 4.5, first Opus-class model co-trained with Cursor

[AINews] SpaceXAI launches Grok 4.5, first Opus-class model post Cursor acquisition

SpaceXAI dropped Grok 4.5 one day before GPT-5.6, positioning it as an Opus-class coding and agent model co-trained with Cursor. Musk called it roughly comparable to Opus 4.7 but faster and cheaper—$2/$6 per million tokens, undercutting both GPT-5.6 and Opus 4.8. It's 1.5T parameters, 3x larger than Grok 4.3, with a 500k context window that may return to 1M next week. Cursor says this is their first model built beyond software engineering and offers double usage for the first week. The post doesn't disclose specific benchmark scores; it notes SWE-Bench Pro is now considered saturated by OpenAI's evals team.

Why it matters: SpaceXAI dropped Grok 4.5 a day before GPT-5.6 — the timing alone is a story. 1.5T params, 3x the previous generation, and $2/M input tokens give a clear performance and cost picture. It's Cursor's first post-acquisition move beyond pure coding, which matters directly to agent...