SpaceXAI and Cursor trained Grok 4.5, a model 6x cheaper than Opus

Grok x Cursor

SpaceXAI and Cursor jointly trained Grok 4.5, landing between Opus 4.7 and 4.8 in performance but 6x cheaper than Opus and 3x cheaper than GPT-5.5 on a per-token basis. OpenAI rolled out GPT-5.6 (Sol, Terra, Luna) to all users; early testers say Sol is less smart than Fable but far more reliable. ChatGPT Voice got new GPT-Live-1 and Live-1-mini models that can talk while you speak and use GPT-5.5 in the background. Anthropic extended Fable 5 access for Claude subscribers to July 12—the post doesn't explain the repeated delays. Meta introduced Muse Image and Muse Video; image editing and text rendering look solid, but images still have an AI look, and the video model is in preview.

Why it matters: SpaceXAI + Cursor joint Grok 4.5 launch with concrete performance anchor and pricing — all three HKR axes hit. Deduction because source is a newsletter summary, not a first-party announcement, and the body is truncated with incomplete GPT-5.6 info. +3 cross-source bump to 82, ...