Callibre · Field notes

The blog, written like an operator.

Pricing-model autopsies, unit-economics math, and the half-dozen things teams deploying voice AI — enterprises and the agencies serving them — only learn at month three. From the Callibre team.

Security & compliance
What a security review actually asks of a voice-AI vendor

Encryption, access control, audit logs, residency, signed agreements, resilience — the seven things an enterprise security team checks before an AI agent touches their customers.

6 min read · 4 Jul 2026
Pricing · Field note
Why voice-AI agency margins die in month three

The retention math nobody runs before they sign the client. Token-metered platforms eat your retainer the moment a caller talks for too long.

5 min read · 21 May 2026
Field exhibit · Real invoices
Our own GHL receipts: $0.142, then $0.215, then $0.3497

Three calls on the same GoHighLevel account. Same agent. Hours apart on one, two months apart on the other. What the receipts taught us.

7 min read · 21 May 2026
Agency economics
The $50K MRR wall — and the owner-as-deliverer trap behind it

Why most HighLevel agencies stall around $50K. The bottleneck is almost never strategy; it's the founder still doing the delivery.

6 min read · 21 May 2026
Engineering · LLM selection
Picking the right LLM for a voice agent: cost vs quality across ten models

Gemini Flash to Claude Sonnet 4.6 in a per-minute table. Where the floor is, where the ceiling buys you something, and when to swap.

6 min read · 21 May 2026
White-label mechanics
What "real white-label" means under the hood

Domain mapping. Notification email domain. Support routing. Billing posture. The five layers most "white-label" SaaS skips quietly.

5 min read · 21 May 2026
Pricing · Agency margin
Pass-through voice pricing: the math that lets you quote a flat client rate

If your cost moves at call time, your margin moves at call time. The case for flat per-minute infrastructure, drawn out with numbers your clients will accept.

5 min read · 21 May 2026