streamTextDeltas

Streams raw text deltas straight from a model with no tool loop, no steps, and no result accumulation. It is the smallest possible streaming call.

Use it when you want tokens and nothing else, or when you are building your own loop on top of the model protocol. Most applications want streamText.

for try await delta in streamTextDeltas(
  model: OllamaModel("qwen3"),
  prompt: "Count to ten."
) {
  print(delta, terminator: "")
}

Signature

func streamTextDeltas(
    model: any LanguageModel,
    messages: [Message] = [],
    system: String? = nil,
    prompt: String? = nil,
    maxOutputTokens: Int = 1024,
    temperature: Double? = nil
) -> AsyncThrowingStream<String, Error>

Defined in Sources/AI/Core/GenerateText.swift.

Parameters

Returns

An AsyncThrowingStream<String, Error> of text deltas.

See also

• streamText