Elon Musk's xAI announces a 1M+ token context window for Grok 4.5, challenging Anthropic's Claude Opus in the intensifying AI capabilities arms race.

Elon Musk said the latest version of Grok is “faster, more token-efficient and lower cost” than one of Anthropic’s models.

xAI is speeding up development amid the race for the fastest and cheapest model in the AI space. Grok 4.5 first surfaced in private beta at Tesla and SpaceX in June, with Musk…