xAI launches Grok 4.5, Opus-class coding model at $2/$6 per million tokens

xAI's Grok 4.5 launch reflects a strategic shift toward the coding-and-agents market segment that has become central to LLM (AI that understands and generates text) competition. The body frames Grok 4.5 not as a general-purpose flagship chasing absolute benchmark supremacy, but as a specialist model optimized for efficiency and speed in engineering workflows. This positioning aligns with Elon Musk's framing of the model as "roughly comparable to Opus 4.7, but much faster," emphasizing utility to Tesla and SpaceX engineers over benchmark chasing.

The efficiency gains are substantive: independent evaluation by Artificial Analysis found that Grok 4.5 achieves near-frontier capability while using 60% fewer output tokens per task than Opus 4.8, translating to lower cost per task ($0.31–$2.59 depending on task type). The pricing undercuts both OpenAI's GPT-5.6 and Anthropic's Opus 4.8, which positions Grok 4.5 as a value proposition for cost-sensitive developer and enterprise use cases, particularly those running agents (autonomous AI systems) that incur high token consumption. The body notes that Grok 4.5 is 3x larger than Grok 4.3, a substantial architectural jump that supports its capability gains.