SpaceXAI Releases Grok 4.5, Which Elon Describes as an 'Opus-Class Model'

What happened

SpaceXAI on July 8 released Grok 4.5 — its first AI model developed in partnership with Cursor, a month after announcing the $60B acquisition of Cursor.

Context and impact

Grok 4.5 is focused on long-horizon agentic tasks in legal, finance, and coding — not general-purpose chat. SpaceX absorbed xAI in February 2026 and rebranded it as SpaceXAI. Elon Musk described it as an 'Opus-class model' placing it alongside Claude Opus 4.8 and GPT-5.5, with claimed 2x token efficiency over competing models.

Details

• Pricing: $2/M input tokens, $6/M output; premium: $4/$18
• Legal tasks: contract review, case files, regulatory analysis, drafting
• Finance tasks: due diligence, investment research, risk assessment
• Not available in EU — mid-July launch expected
• SpaceX acquisition of Cursor for $60B expected to close Q3 2026