SpaceXAI's Grok Bot, the consumer AI agent app launched this summer for iPhone, iPad, and Mac, has received a major backend upgrade: it now runs on Anthropic's Claude Opus 5.5 for intelligence instead of SpaceXAI's own less capable models. The upgrade is live today.

The cross-lab move is notable given the rivalry. Anthropic became a SpaceX customer earlier this year as it shopped for compute to power Claude usage, and SpaceXAI's founder Elon Musk recently admitted Grok 4.7 trails Claude Opus 5.5 in raw capability.

Grok Bot is competing directly against Meta's mostly-free Muse agent and OpenAI's ChatGPT Dot, the Astra-powered proactive agent unveiled at DevDay. The upgrade signals SpaceXAI is willing to rely on a competitor's frontier model where the consumer experience depends on it.