
GPT 4.1 Fast vs Realtime 1.5: which voice AI engine fits your call type
Three voice AI engines power Waboom's live Talk to Michelle demo. 4.1 Fast wins cold calls. Realtime 1.5 wins flowing conversation. Here is which one to pick for your business.
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Three voice AI engines power Waboom's live Talk to Michelle demo. 4.1 Fast wins cold calls. Realtime 1.5 wins flowing conversation. Here is which one to pick for your business.

OpenAI shipped GPT Realtime 2 with GPT-5 class reasoning, a 128k context window and async function calling. We rolled it across the Waboom AI call floor this week. Here is what changes on your cold call, in numbers.

We ran 10,713 outbound calls for a Sydney property agency in 90 days for AU$4,617, which is AU$0.43 per dial all-in. Extrapolated to 10,000 calls a month, the same stack costs roughly AU$4,300. The Philippines BPO alternative lands closer to AU$25,000. Here's the maths in AUD.
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Explore AI trainingLast updated 10 May 2026 · by Leonardo Garcia-Curtis