Streaming

swift
for try await chunk in session.streamResponse(to: prompt) { /* update UI with PartiallyGenerated */ }

Use isResponding gate; throttle UI to 60fps; handle contextSizeExceeded mid-stream by preserving transcript.

Multimodal Prompting

swift
let ref = ImageReference(image: cgImage)
let prompt = Prompt("Describe this chart") + Attachment(image: ref)

Combine ImageAttachmentContent + text; see Overview.

Private Cloud Compute

swift
let pcc = PrivateCloudComputeLanguageModel()
let session = LanguageModelSession(model: pcc)

Larger window, stronger reasoning, privacy-preserving. Entitlement com.apple.developer.private-cloud-compute. Fall back to on-device when unavailable.

Dynamic Sessions

DynamicProfile, Profile, SessionProperty allow runtime tool/instruction composition + onToolCall counting for required→allowed transitions.

See Tool Calling and Catalog.