LLM Chat Benchmark by Ritesh

Real user monitoring for LLM based chatbots like ChatGPT, Gemini, Perplexity and Claude. Measures time to first word, time to last word, stall, and streaming speed in the UI.

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About this extension

LLM Chat Benchmark measures real user performance for AI chat apps like ChatGPT, Claude, Gemini, and Perplexity directly in the browser UI. It tracks time to first word, time to last word, stall/jitter, word count, and streaming speed, then shows results in a floating overlay and local dashboard with charts, model breakdowns, import/export, and raw-data inspection. All data stays local in this release; no remote telemetry is sent.

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Permissions and data

Required permissions:

Access your data for chatgpt.com
Access your data for chat.openai.com
Access your data for claude.ai
Access your data for gemini.google.com
Access your data for perplexity.ai
Access your data for www.perplexity.ai

Optional permissions:

Access your data for chatgpt.com
Access your data for chat.openai.com
Access your data for claude.ai
Access your data for gemini.google.com
Access your data for perplexity.ai
Access your data for www.perplexity.ai

Data collection:

The developer says this extension doesn't require data collection.