AI startup Temporal raises $550M at $12.55B valuation

The scale and speed of this round — more than doubling in seven months, with a bulge-bracket and crossover investor roster — says late-stage capital is still chasing a narrow set of AI infrastructure names rather than spreading across the sector. That concentration matters for the broader private-market pipeline: when this few firms absorb this much capital at these marks, the bar for everyone else rises. Whether the valuation trajectory holds through the next financing cycle, and whether these backers keep pace, is the open question.