Creates a response stream containing deltas.
- Parameters:
- request: The generation request.
- model: The model instance for this request, providing live model state.
- channel: A channel used to send events.
- Note: If the model declares that it does not have a given capability
via ``LanguageModel/capabilities``, then the system will automatically
throw an error instead
of invoking this method. You do not need to manually validate the request
for any functionality captured by ``LanguageModelCapabilities``.