What is an AI SDR?
An AI Sales Development Rep is an autonomous agent that owns the top of the funnel: greeting inbound visitors within seconds, replying to form submissions, running outbound at ICP scale, qualifying against a real playbook, and booking the first meeting on the AE's calendar.
The good ones behave like a well-trained SDR at 3am — not a chatbot. They ask real discovery questions, they know when to shut up, and they hand off to a human the moment the buyer signals a strategic conversation.
Inbound vs outbound AI SDRs
Inbound
Inbound AI SDRs (like CoLive's Vesper) live on your website, in your product signup flow, and inside inbound email. Their job is speed-to-lead: get to the buyer in under 60 seconds, qualify, and book. Every minute of delay after a form fill cuts conversion by ~10%.
Outbound
Outbound AI SDRs (like Mira) mine closed-won lookalikes, layer intent signals (job changes, funding, technographic shifts), and write multi-channel sequences in the founder's voice. The bar isn't "personalized-looking" — it's "would a human SDR be embarrassed to send this?"
Benchmarks to hold an AI SDR to
- Inbound response time: <90 seconds P95.
- Meeting book rate on qualified inbound: 35-50%.
- Show rate on booked meetings: 75%+.
- Outbound reply rate: 8-12% on well-targeted lists (vs 1-3% for sequence-blast tools).
- Meetings per 1,000 sends: 15-25.
- Human handoff rate on hot leads: 100% — no exceptions.
What AI SDRs are still bad at (and why that's fine)
AI SDRs are bad at reading a room, at brand-defining first impressions with your top 20 target accounts, and at the awkward-but-necessary follow-up with a champion who just went dark for personal reasons. Keep humans on those. Use AI for the other 95% of the funnel.
The stack you actually need
- A conversation runtime that can chat, email, and call — not just one.
- ICP + intent data (Clay, Apollo, LinkedIn, Segment).
- Calendar + CRM integration that writes back cleanly (Salesforce, HubSpot, Chili Piper).
- An AI Sales Engineer alongside it — an AI SDR that can't answer technical questions stalls the moment the buyer asks a real one. See our AI Sales Engineer guide.