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Sending a model's response token by token as it is generated, instead of waiting for the whole answer, so text appears progressively.
Because language models produce one token at a time, an API can emit each token as soon as it is ready rather than buffering the full reply. This is commonly delivered over Server-Sent Events, a browser-native streaming mechanism defined in the HTML Living Standard.
Streaming lowers perceived latency — the user sees words immediately — even though total generation time is unchanged.
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