AssemblyAI v3 and LLM Gateway Migration

Overview

Migrate legacy AssemblyAI Streaming v2 and LeMUR integrations to Streaming v3 and LLM Gateway with parity evidence. Treat live audio, transcript content, credentials, spend, and destructive state as separately governed boundaries.

Prerequisites

• The target repository or integration path and the requested operator outcome.
• The AssemblyAI project, environment, region, data classification, and accountable owner.
• Current first-party documentation plus credentials only for a narrowly approved live check.

Current Contract

Streaming v2 used /v2/realtime/ws; v3 uses /v3/ws with different messages, turns, configuration, and termination. LeMUR sunset on March 31, 2026; LLM Gateway is the current analysis path. Deprecated transcript summary parameters must not anchor new designs.

Authentication

For live work, inject ASSEMBLYAI_API_KEY from an approved secret manager and send the raw value only in the AssemblyAI Authorization header to the configured first-party host. Never print, commit, place in a URL, or expose it to an untrusted client. Callback secrets and temporary streaming tokens are separate credentials.