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Multi-Week LLM Gateway Evaluation: OpenRouter vs Concentrate.ai vs Portkey vs LiteLLM

OpenAI Anthropic llm_infrastructure developer_tools api_gateway latency pricing

Summary

Developer shares multi-week shoot-out of four LLM gateways—key findings on streaming latency, pricing markup, and vendor lock-in risk across OpenRouter, Concentrate.ai, Portkey, and LiteLLM.

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Original headline: Multi-Week LLM Gateway Evaluation: OpenRouter vs Concentrate.ai vs Portkey vs LiteLLM