xAI 7/8 Grok 4.5 launch: DeepSWE 62% / SWE Marathon 29% / ~4.2x fewer output tokens than Opus 4.8, default in Cursor across all plans on launch day

xAI's July 8, 2026 launch post introduces Grok 4.5 as SpaceXAI's newest flagship, built for coding, agentic tasks, and knowledge work; the post says the model was co-trained with Cursor on 'tens of thousands of NVIDIA GB300 GPUs.' Self-reported benchmarks: DeepSWE 1.0 62.0% (vs Fable max 66.1%, GPT 5.5 xhigh 64.31%); SWE Marathon 29.0% resolution rate (highest reported); Terminal Bench 2.1 83.3%; SWE Bench Pro 64.7%; on SWE Bench Pro, ~4.2x fewer output tokens than Opus 4.8 max (15,954 vs 67,020). Served at ~80 TPS, priced $2 / $6 per million input / output tokens; available in Grok Build, Cursor (all plans), and the SpaceXAI API at launch; not yet available in the EU in any SpaceXAI product or API console (mid-July ETA).