OpenRouter Inc., a startup that routes software prompts to large language models based on cost and performance, has secured $40 million across two funding rounds led by Andreessen Horowitz and Menlo Ventures, with participation from Sequoia Capital and several angel investors. The fresh capital values the San Francisco-based company at roughly $500 million, according to people familiar with the terms. The company’s cloud API lets developers tap more than 400 models offered by more than 60 providers through a single interface, consolidating billing and automatically shifting workloads when a model is offline or becomes more expensive. OpenRouter says the service is used by about 2.5 million developers and now processes roughly 8.4 trillion tokens a month, putting annualized inference traffic near 100 trillion tokens and customer spend above $100 million. Management plans to channel the new funding into expanding model coverage, enhancing enterprise features such as higher rate limits and lower latency, and hiring to support a growing roster of corporate clients that includes software firms seeking to curb AI infrastructure costs.