Elon Musk just expressed some choice words over Anthropic, a key partner to Amazon.

Rivalries have existed for as long as history can remember. In today's world, we often associate them with sports -- where players, and by extension, the fans -- trade barbs during tense competition. What's more surprising, though, is how similar rhetoric emerges in the corporate arena from time to time.

In recent weeks, Palantir Technologies CEO Alex Karp all but declared a decisive victory over his company's competition. Salesforce CEO Marc Benioff, however, didn't let that jab go unanswered -- hinting instead that Palantir's software is overpriced .

One executive who has never been one to mince words or avoid expressing blunt opinions is Elon Musk. In recent years, he has frequently sparred pu

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