Should you build your own real-time AI sales coach with ChatGPT or Claude? A build vs buy checklist

1.

Audio capture on every call type: Zoom, Teams, Meet, browser dialers, softphones, speakerphone and in-person meetings, on Mac and Windows, without joining the call as a bot.

2.

Live transcription that keeps up with fast talkers, accents, crosstalk and bad connections.

3.

Speaker roles: knowing which lines are the rep and which are the buyer, including when both voices come through one microphone.

4.

Timing: deciding when to speak. Prompting after every sentence is noise; waiting too long is useless. Answers need to land in about two seconds.

5.

Playbook grounding: using your talk tracks, objection answers and call steps, following rules like “no pitch until discovery is done”, and not repeating questions the buyer already answered.

6.

The rep’s screen: a small overlay that stays out of the way and hides when the rep shares their screen.

7.

After the call: transcripts, scores against your criteria, manager review, roleplay practice on the same playbook, and CRM sync.

8.

Security and operations: workspace separation, encryption, access controls, a vendor review for your customers, model costs that scale with call hours, and someone on call when it breaks during a live sale.

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Live coaching is part of the product you sell, not a tool for your own reps.

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You have data rules no vendor can meet, such as calls that may never leave your own cloud.

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You have a team that can own audio, AI and a desktop app long term, not just for a hackathon.

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Your calls are so specialized that no vendor can learn them, even with your documents uploaded.

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Coaching is a means to more closed deals, and you want results this quarter.

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Your engineers have a product roadmap that customers are paying for.

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You want roleplay, scoring and live coaching on the same playbook without building three products.

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You need it to work across different phone and meeting setups, not just one.