(Bloomberg) — Amazon.com Inc. is investing an additional $4 billion in artificial intelligence startup Anthropic, boosting its stake in one of OpenAI’s chief rivals.Most Read from BloombergTrump Promises Could Have Seismic Impact on Washington EconomyTokyo’s Scorching Summers Focus Public Anger Against Tree CuttingNYC Mayor Adams Names Jessica Tisch to Lead Police Head Amid ProbesParis to Replace Parking Spaces With TreesNew York’s Transit Agency Approves $9 Congestion TollThe new infusion, ann