Pricing

Pricing built around
your voice agent.

A one-time build fee, simple per-minute usage, and a monthly management fee. Our team designs, runs, and improves every agent for you.

Managed voice agents

Three ways to work with us.

Convexa AI pricing includes a one-time build fee for designing, configuring, testing, and launching your managed AI voice agent, plus per-minute usage and a monthly management fee for reporting, maintenance, and optimisation.

Starter Voice Agent
For small businesses testing a managed AI voice agent.
Build feefrom£1,500
Usagefrom£0.20/min
Managementfrom£250/mo
  • One AI voice agent, built and run for you
  • Call flow designed and set up by our team
  • Your FAQs and key answers configured for you
  • Written summary after every call
  • Call routing set up to your team
  • Tested on real call scenarios before launch
  • Monthly performance report from our team
Book a call
Scale Voice Agent System
For companies with higher call volume, complex workflows, or multiple departments.
Build feefrom£7,500
Usagefrom£0.40/min
Managementfrom£1,500/mo
  • Multiple AI voice agents or advanced workflows, built for you
  • Advanced call routing designed and managed for you
  • Appointment booking handled end to end
  • Knowledge base configured and maintained by our team
  • CRM, helpdesk, or calendar integrations connected where possible
  • Outbound campaigns set up and run for you
  • Advanced reporting prepared by our team
  • Ongoing optimisation and tuning by our team
  • A dedicated account manager
Discuss your workflow

Final pricing depends on call volume, workflow complexity, integrations, phone setup, and support requirements. Convexa AI is a managed service, so our team handles setup, configuration, optimisation, and reporting.

Managed service estimate

Estimate your managed service.

Pick your usage and our team handles the rest — Convexa configures, manages, reports on, and optimises the agent. This is a planning estimate, not a self-serve checkout.

Monthly call

Enter your expected monthly call volume in minutes to estimate your managed service cost.
12,500min / mo

Choose your options

Language model
Voice / TTS
Speech-to-speech optional
Telephony
Call agent add-ons
Cost per minute£0.163
LLM cost · GPT 5£0.059/min
Voice infrastructure£0.082/min
Voice / TTS£0.022/min
Telephony£0.000/min
Add-ons£0.000/min
Total per month£2,038
Estimated usage · pay-as-you-go
Book a call for a tailored quote

Estimates are for planning only. Final pricing depends on call volume, workflow complexity, integrations, phone setup, and support requirements. Convexa AI is a managed service, so our team handles setup, configuration, optimisation, and reporting. Final pricing confirmed after your workflow review.

Compare plans

What’s included,
side by side.

Starter
Scale
Core
Managed voice agents
1
Multiple
Concurrent calls
10
12,000 +
Languages
12
40 +
Voice library
180
340 + custom brand
Agent design
Designed by Convexa team
Custom integrations
Function calling
Knowledge base
1 GB
Unlimited
Operate
Live call monitoring by our team
Post-call reporting
30 days
Unlimited
Recording retention
7 days
Configurable
Custom QA review
Security & compliance
SOC 2 Type II report
On request
Included
NHS DSPT · DPA 2018
Included
SAML SSO
Regional data residency
UK
5 regions
Audit logs
30 days
7 years
Support
Channel
Email
Slack, named SE
First response SLA
2 business days
30 minutes · 24×7
Component pricing

Detailed component pricing.

These are the main usage and service components that can affect your monthly Convexa AI cost. Final pricing depends on the managed voice agent workflow, call volume, integrations, phone setup, reporting requirements, and ongoing optimisation needs.

Convexa AI is a managed service. These component prices are used for estimating service usage and implementation scope. Clients do not receive direct access to the underlying platform or software.
Component
Notes
Convexa pricing
Voice infrastructure
Core managed voice agent infrastructure
£0.082/min
Standard voice synthesis
Standard managed voice options
£0.022/min
Premium voice synthesis
Premium voice options, including ElevenLabs-style voice quality where available
£0.060/min
OpenAI voice synthesis
OpenAI voice option where suitable
£0.022/min
Custom telephony / SIP
No Convexa per-minute telephony charge where client-approved telephony is used
£0.00/min
Managed telephony
Managed phone network setup where required
From £0.022/min
Model
Standard · Fast / premium
GPT 5.5
Standard£0.238/minFast£0.476/min
GPT 5.4
Standard£0.119/minFast£0.238/min
GPT 5.2
Standard£0.083/minFast£0.166/min
GPT 5.1
Standard£0.059/minFast£0.119/min
GPT 5
Standard£0.059/minFast£0.119/min
GPT 5 mini
Standard£0.018/minFast£0.036/min
GPT 5 nano
Standard£0.0045/minFast£0.009/min
GPT 4.1
Standard£0.067/minFast£0.100/min
GPT 4.1 mini
Standard£0.024/minFast£0.036/min
GPT 4.1 nano
Standard£0.006/minFast£0.009/min
Claude 4.6 Sonnet
Standard£0.119/minFastQuoted if required
Claude 4.5 Sonnet
Standard£0.119/minFastQuoted if required
Claude 4.5 Haiku
Standard£0.037/minFastQuoted if required
Gemini 3.0 Flash
Standard£0.040/minFastQuoted if required
Gemini 2.5 Flash
Standard£0.052/minFastQuoted if required
Gemini 2.5 Flash Lite
Standard£0.009/minFastQuoted if required
Option
Notes
Convexa pricing
GPT Realtime 1.5
Premium real-time speech-to-speech option
£0.513/min
GPT Realtime
Real-time speech-to-speech option
£0.513/min
GPT Realtime mini
Lightweight real-time speech option
£0.104/min
Add-on
Notes
Convexa pricing
Knowledge Base usage
Allows the managed voice agent to reference approved knowledge sources during calls
+£0.007/min
Batch Call
Managed outbound campaign dial handling
+£0.007/dial
Branded Call ID
Branded outbound caller identity where available
+£0.149/outbound call
Advanced Denoising
Additional audio cleaning for noisier call environments
+£0.007/min
Safety Guardrails
Additional managed guardrail configuration
+£0.007/min
PII Removal
Personal information redaction where configured
+£0.015/min
AI Quality Review
Additional AI-assisted call quality review
+£0.149/min
Component
Notes
Convexa pricing
Managed phone number
Where Convexa provides and manages a phone number
£3/month
Managed SMS setup
Where SMS is configured as part of the workflow
£30/month
Additional concurrency
Additional active call capacity beyond agreed plan allowance
£12/concurrent call/month
Additional knowledge base
Additional approved knowledge source set beyond agreed scope
£12/knowledge base/month
Verified phone number
Verified phone number setup where available
£15/phone number/month + £15 setup
Chat Agent pricing
Component
Convexa pricing
GPT 5.5
£0.077/AI message
GPT 5.4
£0.039/AI message
GPT 5.2
£0.027/AI message
GPT 5.1
£0.019/AI message
GPT 5
£0.019/AI message
GPT 5 mini
£0.006/AI message
GPT 5 nano
£0.0015/AI message
GPT 5.4 mini
£0.018/AI message
GPT 5.4 nano
£0.0045/AI message
GPT 4.1
£0.022/AI message
GPT 4.1 mini
£0.009/AI message
GPT 4.1 nano
£0.003/AI message
Claude 4.5 Sonnet
£0.045/AI message
Claude 4.5 Haiku
£0.010/AI message
Claude 3.7 Sonnet
£0.031/AI message
Claude 3.5 Haiku
£0.009/AI message
Gemini 2.5 Flash
£0.018/AI message
Gemini 2.5 Flash Lite
£0.009/AI message
Gemini 2.0 Flash
£0.009/AI message
Gemini 2.0 Flash Lite
£0.0045/AI message
SMS
£0.015/message

Most clients do not need to choose every component individually. Convexa AI scopes the correct configuration during the workflow review, then provides a managed service estimate based on expected call volume, workflow complexity, phone setup, integrations, and reporting requirements.

International calling, complex integrations, compliance-sensitive workflows, bespoke reporting, and high-volume outbound campaigns may require a custom quote.

All prices in GBP. Final pricing confirmed after your workflow review.

Common questions.

Each plan combines a one-time build fee for designing and launching your agent, per-minute usage, and a monthly management fee for reporting, maintenance, and optimisation. There are no seat fees — our team builds and runs the agent for you.

Time to hire your AI call centre.

Convexa builds, runs, and improves your voice agents end to end — from lead qualification to appointment booking. Tell us about your calls and our team will have a managed agent live in weeks.

Built to scale,
human by design.

Talk to our team. We’ll come back with a flow, a timeline, and a cost.