bubufuDoes playback call an AI model?
No. It displays text at a selected speed, so it cannot test the real performance or availability of an API.
Token streaming speed simulator
Token Speed Simulator
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See how AI answers feel at different token streaming speeds. Play the same text at different tokens/s to compare pacing and reading comfort. This free browser player needs no account and makes no model API call during playback. It is not a live benchmark of your account, network or hardware.
Guide: comparing AI streaming speeds
What is already public01 / FEATURES
Compare the same text
Choose a model and version, then play sample text or enter your own. Keep the text unchanged while varying speed. Side-by-side comparison makes differences in output pacing easier to see.
What do 20, 50 and 100 tokens/s mean?
For an assumed output of exactly 200 tokens, steady streaming takes about 10, 4 or 2 seconds respectively: 200 divided by speed. These are arithmetic examples, excluding time to first token, transport and rendering. They are not benchmark scores.
Dated reference data
Check the source and snapshot date inside the app before using model speed references. Output cost is estimated only when public pricing is available. This introduction does not duplicate a leaderboard that could become stale.
Boundaries02 / BOUNDARIES
Tokens are not words
The player approximates one token as about four characters; it does not use each model’s tokenizer. Chinese, English and code can tokenize very differently. Do not use simulated duration to calculate a real bill.
TTFT and streaming speed differ
Time to first token measures the wait before the first output token. Tokens/s describes the subsequent stream. Queueing, prompt length, reasoning and network conditions also affect the actual experience.
URL import has a separate boundary
Typed text plays locally. Importing a public URL requires reading that page and may use a reader proxy when direct access fails. Do not import private URLs, access tokens or confidential material.
Portal and product site03 / PORTAL
Open the player directly
The working application is https://bubufu.com/tools/token-speed-simulator/ . This page explains the workflow and limitations; the app handles playback and comparison. No account detour or platform membership is required.
Questions04 / FAQ
How can I compare two speeds fairly?
Use identical source text, a matching start and the same browser window. Changing model families can clear a text pane; refill it before comparing.
Can speed alone identify the best model?
No. Evaluate correctness, quality, price, time to first token and reliability on your own tasks. A reference snapshot does not predict your account or provider performance.