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174msp95 ttft

Production voice AI.
One cent a minute.
Phone number included.

$0.04/min vs OpenAI's $0.16-0.33. We don't make you bring Twilio.

5-line diff from openai to toolkit. Curl it in 60 seconds →

Phone numbers $1/moBriefing context freeAudio retention 0

Section 02

One import. Same code.

Drop-in replacement for the OpenAI Realtime SDK. 3 lines change, 2 unchanged, 100% behavior compatible. 74/77 events at launch.

OpenAI Realtime
import OpenAI from "openai";

const client = new OpenAI();
const session = await client.realtime.sessions.create({
  model: "gpt-realtime",
});
@toolkit-llm/voice
import { Toolkit } from "@toolkit-llm/voice";

const client = new Toolkit();
const session = await client.realtime.sessions.create({
  model: "toolkit-voice",
});

3 lines change. 2 unchanged. 100% behavior compatible. 74/77 events at launch.

Section 03 · The math

$551 vs $2340 — save $1789/mo (76%)

At 10,000 min/mo with a 70/30 mini-flagship mix. Drag the slider to compute your scenario.

10,000min/mo
50010K200K
You save
$589/mo
52% less than cheapest competitor at this volume
toolkit-voice (70/30 mix)
$0.055/min · 70% mini, 30% flagship (typical production mix)
$551
1.4×
OpenAI Realtime mini
$0.234/min · + Twilio, + you bring carrier, audio retained 1hr default
$2,340
5.9×
OpenAI gpt-realtime-2
$0.414/min · + Twilio, + you bring carrier, audio retained 1hr default
$4,140
10.4×
Vapi
$0.210/min · LLM + STT + TTS + Twilio + Vapi platform (all separate line-items)
$2,100
5.3×
Bland
$0.114/min · + Twilio (no DID bundled)
$1,140
2.9×
Retell
$0.154/min · + Twilio + LLM (varies by config)
$1,540
3.9×

Section 04 · What's included

Phone numbers. Free briefing. Zero retention.

$1/mo

Phone numbers

US local DIDs included. Vanity numbers $5/mo. Port-in 5-7 days. We handle E911, STIR/SHAKEN, A-attestation.

free

Briefing context

Up to 4K tokens of fresh world knowledge prefix-cached server-side. Hourly refresh. No per-turn billing.

0 bytes

Audio retention

Transit through DO memory, discarded on STT ack. Voice is GDPR Art. 9. We never hold your customer's voice.

Section 05 · See what developers build

5 verticals. 5 vanity numbers. All callable.

klawvoice.com is the showcase — every persona is built on this API. Pick one and they call you in 8 seconds.

AUTO · DC MOTORCARS
Tony
Books test drives at 2am. Doesn't ask for a raise.
+1 (415) CAR-TONY
See Tony →
REAL ESTATE · CORAL GABLES
Maria
Qualifies leads while you're at the open house.
+1 (305) CASA-NOW
See Maria →
CONSTRUCTION · IBGC
Mike
Quotes the job before you climb off the ladder.
+1 (510) BUILD-IT
See Mike →
PICKLEBALL · TTC PALMS
Jenny
Books your court before you finish stretching.
+1 (805) PLAY-JOY
See Jenny →
TIRES · BIG O
Sam
Knows your tire size. Has the slot tomorrow at 7:45.
+1 (702) NEW-TIRE
See Sam →
See it across 5 verticals →

Section 06 · Open source

The benchmark you can run. The probe you can fork.

  • voicebench-10 — 10 scenarios, 9 providers, 3-rater MOS. Apache 2.0.
  • voice-probe — Go binary, 200 LOC. Self-host the latency board.
  • /compat — Public matrix vs OpenAI Realtime spec.
  • /trust — GDPR Article 9, anti-clone clause, SOC 2 roadmap.
  • /faq — The questions devs actually ask. Pricing, BYOC, SLA, residency.