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Vapi is a developer platform and API for building voice AI agents, combining speech-to-text, large language models, and text-to-speech into a unified system.
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OpenRouter
OpenRouter runs a unified API gateway giving developers access to 300+ large language models from 60+ providers through one integration, with model routing, fallbacks and consolidated billing.
OpenRouter is an AI infrastructure company founded in 2023 that operates a unified API gateway to large language models. Its platform gives developers a single integration point for more than 300 models from over 60 providers, with a standardised API that removes the need for separate vendor agreements. The company describes itself as the first LLM marketplace and the largest AI gateway for developers worldwide.
The technical work centres on routing and reliability. OpenRouter's intelligent model routing directs requests across providers and applies automatic fallbacks when a provider fails; other mechanisms include response healing for malformed JSON output, zero completion insurance for incomplete generations, and configurable data policies for enterprises. Alongside the gateway, the company publishes public model rankings derived from real-world usage data. Consolidated billing provides transparent, non-subscription pricing across all providers.
By the company's account, the service serves more than 5m users globally and processes over 100 trillion tokens a year. OpenRouter raised a $40m Series A backed by Andreessen Horowitz, Menlo Ventures and Sequoia Capital. It operates globally and positions itself around developer-first design, the elimination of vendor lock-in, and enterprise-grade reliability.
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