On July 8, Musk announced on X that SpaceXAI will officially open Grok 4.5 to the public on July 9 — the model's first public appearance after entering SpaceX and Tesla internal beta on June 28, and also the first "clean bloodline" product after SpaceX's acquisition of Cursor. Grok 4.5 is based on a 1.5T-parameter V9 base, supplemented with Cursor IDE's real interaction data for incremental training: not static code corpus, but multi-round editing, error recovery, cross-large-repository context and other agentic coding signals. The Information therefore positions it as the "first joint model" between SpaceXAI and Cursor — model lab + IDE data + Memphis Colossus's 220,000 GPUs, now under the same roof. Musk's selling point this time isn't parameters, but "Opus grade, faster, more token-efficient, cheaper". Cheaper is the real hook: the developer's wallet battlefield is shifting from "whose benchmark is higher" to "how much per task". The same week, Anthropic was criticized for Claude Opus 4.7's tokenizer repricing, OpenAI is pushing GPT-5.6 Sol to GA on July 9, and Musk is putting the price dimension on the table, going for the OpenAI/Anthropic enterprise paid mindshare. But one thing isn't resolved: Musk hasn't published any public scores such as SWE-Bench, Terminal-Bench, GPQA. "Opus grade" differs significantly between 4.5/4.7/4.8, without numbers you'll just have to wait until July 9. If Grok 4.5 can really get close to Opus 4.8's 69.2% SWE-Bench Pro level, plus token efficiency, it could indeed pry some Cursor users away — but "Opus grade" has to go from slogan to a buyable spec. July 9 is the most crowded "frontier model day" of 2026 so far: Grok 4.5 and GPT-5.6 Sol GA on the same day, Anthropic's Fable 5 continues to scale after being unfrozen. Grok 4.5's real test is the first batch of independent scores 24 hours later — the single-vendor era is over, what comes next is a contest of routing and cost engineering.