Elon Musk publicly acknowledged on X that Grok, xAI’s AI model, lags behind Anthropic’s latest offerings, particularly Claude Fable 5 and Opus 4.8. Grok 4.5, launched on July 8, 2026, at $2 per million input tokens and $6 per million output tokens, shows a particularly pronounced gap in coding tasks, scoring only 53% on the DeepSWE 1.1 benchmark. Musk attributed the disparity to xAI operating for roughly three years compared to Anthropic’s six years of development. Despite the competition, SpaceX has secured a major compute agreement with Anthropic using xAI’s Colossus data center facilities. Musk expects xAI to reach frontier-level performance by 2027, though Anthropic continues advancing with Opus 5.5.
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