OpenAI for Developers, Sully for Home Services: Picking the Right Tool
OpenAI and Anthropic sell API access at $2.50 and $3 per million input tokens. Sully sells a finished agent a home service owner can turn on today. Here is when each wins.
Key takeaways
- OpenAI is a developer platform selling token-metered API access, not a business product
- 26% of calls to home service businesses go unanswered per Invoca, costing $1,200 per missed call on average
- Hatch's Brown Roofing case study shows conversion rising from the low 70s to 86% after integrated AI deployment
OpenAI's homepage sells you a developer platform. Sully's homepage sells you an agent that picks up your missed calls. Both are "AI." Only one is something an owner-operator can actually use on a Tuesday afternoon.
This post spells out exactly what each one is for, and where a $1M to $10M home service shop should spend its money.
What OpenAI actually sells
OpenAI sells three things: ChatGPT consumer subscriptions, the ChatGPT Team and Enterprise product for office use, and an API for developers who want to build their own applications.
Per OpenAI's API pricing page, the API bills GPT-4o at $2.50 per million input tokens and $10 per million output tokens. Claude Sonnet runs $3 and $15. Neither number means anything to someone who does not know what a token is.
These are raw ingredients. OpenAI is a cloud developer platform in the same way AWS sells compute and S3 sells storage. You do not run your business on raw S3. You run it on Jobber or ServiceTitan, which were built on top of cloud infrastructure.
The same pattern applies to AI.
What a home service owner actually needs
The job list is short and specific.
Return missed calls before the customer dials a competitor. Per Invoca's 2025 data, 26% of calls to home service businesses go unanswered and fewer than 3% of voicemails get a callback. Every one of those is an average $1,200 in lost revenue.
Follow up on open quotes. The MIT Lead Response Management Study hosted by HubSpot found that the odds of qualifying a lead drop 21 times when contact is delayed from 5 to 30 minutes. Speed is literal money.
Answer website questions honestly from your real price book and service area. Not from a hallucinated estimate.
Send the owner a morning brief summarizing what happened overnight and what needs attention today.
That is four specific agents. Not "AI." Four jobs.
The developer toolkit does not do any of this out of the box
If you open the OpenAI API, you get a chat endpoint. It does not know your service area. It does not see your Jobber schedule. It cannot receive a missed-call webhook from Twilio. It does not read your Gmail. It cannot send SMS.
Every one of those pieces is a separate build. Per Altamira's AI agent development cost breakdown, CRM integration runs $2,000 to $5,000 per connector, plus API development, data mapping, and extensive testing.
Second Talent's rate card prices US AI developers at $150 to $300 per hour. A shop wiring OpenAI into Jobber, Gmail, Twilio, and QuickBooks is looking at $30,000 to $60,000 in labor alone, before the monthly token bill.
OpenAI does not claim otherwise. Their documentation assumes you have a developer.
What Sully sells instead
Sully is an AI platform built specifically for $1M to $10M home service contractors: HVAC, plumbing, electrical, roofing, landscaping, cleaning, garage door.
It plugs into the tools you already use: Jobber, Housecall Pro, ServiceTitan, Workiz, GoHighLevel, Gmail, Google Calendar, Slack, QuickBooks, HubSpot.
It ships pre-built agents:
- Missed-call follow-up. Sees a missed call, texts the homeowner within seconds, qualifies the job, books the appointment.
- Lead qualification. Inbound from your website or forms gets asked the right questions so your CSR talks to qualified prospects.
- Quote follow-up. Sees an estimate go out in Jobber, nudges at 48 hours, 5 days, and 14 days on your brand voice.
- AI chat trained on company data. Answers homeowner questions from your live price book, not a frozen PDF.
- Morning brief. Two-paragraph SMS or email at 6:45am summarizing new leads, urgent replies, overdue quotes, and jobs at risk.
Under the hood, Sully calls the OpenAI and Anthropic APIs. On the surface, the owner never sees a token count. The owner sees a booked job.
The framing that matters
OpenAI and Anthropic are developer toolkits. Sully is the pre-built, vertical-specific AI a home service owner can actually use.
This is the same split you see everywhere in software. AWS is a developer toolkit. Jobber is a pre-built product. Nobody tells an owner to "just build your own Jobber on AWS."
The same advice applies to AI. An owner-operator does not have a bench of AI engineers. What they have is a price book, a CRM, a phone line, and a team of techs.
Pick the tool that starts where you are.
When OpenAI is the right answer
There are three cases where going direct to OpenAI or Anthropic makes sense.
You are a developer or a $50M+ holding company with a dedicated AI engineering team. Custom workflows, custom data, full control over prompts and retrieval. The $60,000 build is a rounding error and the team can maintain it.
You want an internal research assistant for your office. ChatGPT Plus at $20 per user per month, or a Custom GPT with your SOPs loaded, is a cheap way to speed up your office manager's drafts and research. Per HubSpot's AI Trends Report, 64% of marketers now use AI for day-to-day activities and save about 2.5 hours a day on average. No integration needed.
You have highly unusual workflows that no vertical platform covers. Rare for a residential home service shop, but possible if you run something adjacent.
For everything else, a vertical platform wins.
When Sully is the right answer
Three tests tell you you are in Sully's zone.
You do not have a developer on staff. If "API integration" is not in your vocabulary, a pre-built agent is the only path that ships.
You already use one or more of Jobber, Housecall Pro, ServiceTitan, Workiz, GoHighLevel, Gmail, Google Calendar, Slack, QuickBooks, or HubSpot. Sully reads from those natively. No custom integration work.
You want results this quarter, not next year. A custom build is a 3 to 6 month project. A pre-built platform is live the week you sign up.
If all three match, the answer is Sully.
The cost framing side by side
DIY on OpenAI direct: $45,000 to $90,000 upfront build per ProductCrafters. Plus $1,000 to $2,000 per month in API, Twilio, hosting, and maintenance. Annualized over 3 years: $30,000 to $60,000 per year.
Sully: subscription pricing that includes the model calls, the integrations, the SMS infrastructure, and the ongoing updates. The math works out to a line item like software, not a capital project.
The missed-call recovery pays for it. Per Invoca's analysis, one recovered missed call averages $1,200. A shop recovering even one a month covers a year of software.
Hatch's Brown Roofing case study is a good public data point for what a pre-built agent actually delivers: year-to-date conversion rose from the low 70s to 86%. Their separate case study reports $62,400 a year in saved overhead. You do not get that by wiring OpenAI in-house.
Real contractor voices on the split
On the Owned and Operated podcast episode 100, John Wilson and Jack Carr describe using AI internally for data analysis, marketing copy, and cleaning up estimates. John called it "an enhancer rather than a complete solution" for internal work.
For customer-facing work, they use integrated tools that schedule directly into ServiceTitan. That is the split: ChatGPT inside the office, integrated agents outside.
Contractors on r/HVAC, per ACHR News, openly complain about homeowners arriving with ChatGPT-generated diagnoses that are wrong. The ACHR piece noted: "It is the confidence and speed with which bad information spreads." A raw ChatGPT on your website quoting the wrong SEER rating is your brand's liability, per the Moffatt v. Air Canada ruling documented by the American Bar Association.
A vertical platform like Sully has the guardrails built in.
The one-line decision
If you are building something to sell, use OpenAI. If you are running a home service business, use Sully.
OpenAI sells tokens. Sully sells booked jobs. Pick the one that matches what you are actually trying to do.
Sources:
- OpenAI API pricing
- Claude API pricing
- Invoca missed calls study
- MIT Lead Response Management Study via HubSpot
- Altamira AI agent development costs
- Second Talent developer rate card
- ProductCrafters AI agent cost breakdown
- Hatch AI Brown Roofing case study
- Hatch AI customer case study
- Owned and Operated podcast 100
- HubSpot State of AI report
- American Bar Association on Moffatt v. Air Canada
- ACHR News on ChatGPT in HVAC
See Sully in action
Sully is the pre-built AI for home service shops. Connect your CRM, email, and phone system in minutes and the agents run on your real data.