xAI launches Grok 4.5, a coding-focused Opus-class model with Cursor

xAI has publicly launched Grok 4.5, its first model trained specifically for coding and agents in partnership with Cursor. Positioned as an "Opus-class" model, it aims to deliver frontier intelligence at leading speeds and cost efficiency rather than absolute benchmark supremacy.

• Grok 4.5 is described as faster and more token-efficient than comparable models like Opus 4.7.
• Official pricing is set at $2 per 1 million input tokens and $6 per 1 million output tokens, with cache hits discounted by 75%.
• The model is available in Cursor, Grok Build/API, Hermes Agent, Portal, and OpenRouter.
• Context window support may increase from 500k to 1M tokens soon.

xAI explicitly targets the coding-agent workflow market, emphasizing usefulness for engineers over benchmark chasing.