xAI Releases Grok 4.5: Opus-Class Coding and Agentic Model
xAI
xAI launched Grok 4.5 on July 8, co-trained with Cursor on real developer session data. Priced at $2/$6 per 1M tokens, it claims Opus-class capability at roughly twice the token efficiency of comparable competitors. Available in Grok Build, Cursor (all plans), and the xAI API; EU availability delayed until mid-July for AI Act compliance. Independent evaluations noted a doubled hallucination rate (54% vs. 25% in Grok 4).
Why it matters
Grok 4.5 enters the Opus-tier coding-agent market at significantly lower cost, though the doubled hallucination rate is a credibility concern for production deployments.
Importance: 4/5
First xAI model claiming Opus-class coding capability with deep Cursor integration at lower price point; multi-source confirmation
Sources
official
Introducing Grok 4.5 | xAI