GPT-Live Drops Tool Calls That Realtime Handled Fine, Developers Report After Migration

Ambitious-Pomelo-700 · reddit · 2026-09-16

A developer reports that a strict phone-agent flow (collect ID → read back → confirm → call backend tool) worked solidly on Realtime, but breaks on GPT-Live: after confirmation, the agent repeats the request or says "let me check that" and ends the turn with no tool call at all — dead air.

The author suspects the split architecture: a speech model talks while a separate delegated model decides tool calls, and the speaker can end a turn without handing off; Realtime was one model doing both. He asks whether others see this after migrating, whether any config reliably makes the delegated model fire same-turn, and whether anyone runs Live purely as a voice layer with all logic in their own backend.

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