BYOK Multi-LLM Benchmarker is a Chrome side panel that runs the same prompt against OpenAI, Anthropic, Gemini, and Groq at once — no server, no middleman. It shows time-to-first-token, total latency, and token counts side by side so you can actually see which model is faster or cheaper for your use case. You bring your own API keys, and every request goes straight from your browser to the vendor. Nothing is proxied, logged, or stored anywhere else.