Software startup Temporal has raised $300 million in a Series D funding round, achieving a valuation of $5 billion. The round was led by Andreessen Horowitz (a16z), with participation from Lightspeed Venture Partners, Sapphire Ventures, and existing investors Sequoia Capital and GIC. Temporal specializes in providing infrastructure for 'durable execution' of code, enabling applications, particularly AI agents, to automatically recover and continue running after failures.