One click in. Their ChatGPT plan covers the AI.
AI-Powered SaaS, Developer Tools, Productivity Apps
Sign in with ChatGPT Integration
Faster Sign-Ups and Lower AI Costs — With One Button
Quick answer: Codersarts AI adds Sign in with ChatGPT to SaaS and AI products. We check your eligibility, build the login flow, link ChatGPT identities to existing accounts and route eligible AI usage to the user's ChatGPT plan. Prices start at $2,500, with delivery in 1–3 weeks.
Announced at OpenAI DevDay 2026, Sign in with ChatGPT lets Plus and Pro users log in to third-party apps with their ChatGPT identity, and eligible OpenAI usage counts toward their ChatGPT plan.
4.9/5 client rating · Clients in 50+ countries · Fixed-price builds · NDA on request · Working-hour overlap with US & Europe
WHY IT MATTERS
Why Add Sign in with ChatGPT?
Every AI feature you ship has a per-request cost. When users bring their own ChatGPT plan, eligible usage counts against their allowance — not your margin.
Fewer sign-up steps for ChatGPT users
Lower AI cost per active user on eligible usage
"Works with your ChatGPT account" positioning, used by launch partners Notion, Vercel and Devin
WHAT WE BUILD
What's Included?
Eligibility check — current access options for your account
Login integration — Sign in with ChatGPT next to your existing login options
Account mapping — link ChatGPT identities to existing users without duplicates
Usage routing — eligible AI requests go through the user's ChatGPT allowance, with your API as fallback
Pricing review — plan options now that some users bring their own AI allowance
Analytics — sign-ups, activation and AI cost per user by login method
FREE IN 48 HOURS
What You Get Before You Pay Anything
An Eligibility & Savings Estimate: your access options, the integration scope, and the estimated AI cost per user you could shift — within 48 hours.
COMPARISON
Before vs After
Email / Google login only | With Sign in with ChatGPT | |
Sign-up | Form, verification, onboarding | One click for ChatGPT users |
AI cost per active user | Fully on your bill | Eligible usage on the user's ChatGPT plan |
Positioning | Another AI tool | Works with your ChatGPT account |
WHO THIS IS FOR
Is This Right for Your Product?
A strong fit if you are:
An AI-powered SaaS where model costs eat into margins
A developer tool or productivity app whose users already pay for ChatGPT
A product with high sign-up drop-off that wants a one-click option
Not a fit if: your product has no AI features and few ChatGPT-paying users — a standard Google login delivers most of the benefit.
PRICING
How Much Does the Integration Cost?
Login Only | Login + AI Usage | Full Integration | |
Price | $2,500 | $4,500–$6,000 | $6,000–$8,000 |
Timeline | 1 week | 2 weeks | 3 weeks |
Scope | Sign-in and account mapping | + usage routing and fallback | + pricing review and analytics |
What affects the price: how complex your current auth is, the number of AI features to route, and your billing setup.
HOW WE WORK
How We Integrate It
Eligibility check (Days 1–2) — access options, current auth and AI usage
Build (Weeks 1–2) — login flow, account mapping and usage routing
Test (Weeks 2–3) — existing users, plan changes and fallbacks
Launch — rollout with analytics in place
OUR GUARANTEES
Our Guarantees
NDA on day one — signed before you share any code or documents
You own the code at every milestone — full IP transfer, no retained rights
30-day bug-fix warranty — free fixes for 30 days after launch
Backup engineer — a briefed second engineer if anyone on your project is unavailable
Compliance-aligned — built to align with GDPR, HIPAA and SOC 2 controls
Time-zone overlap — working hours that overlap with US, UK, European and Middle East teams
KEY FACTS
Key Facts
Service | Sign in with ChatGPT integration |
Starting price | $2,500 |
Timeline | 1–3 weeks |
Launched by OpenAI | DevDay 2026 (September 29, 2026), 16 launch partners |
Eligible users | ChatGPT Plus and Pro |
WHY CODERSARTS
Why Codersarts
We've built authentication and LLM integrations for SaaS products in 50+ countries. We look at the business side too — AI cost per user and pricing — not just the button.
FAQ
Frequently Asked Questions
Can any app use Sign in with ChatGPT today? OpenAI launched it with partners and controls access. We check the current options for your account and get your app ready to switch on.
Will it replace our existing login? No. It sits alongside email, Google or SSO login, and we map accounts so existing users don't get duplicates.
How much can it reduce our AI costs? It depends on how many of your users have eligible ChatGPT plans and how much of your AI usage qualifies. Our free estimate calculates it from your data.
How much does the integration cost? From $2,500 for login and account mapping. With usage routing and analytics, $4,500–$8,000.
What happens for users without ChatGPT? They use your normal login and your own AI setup. Nothing changes for them.
GET STARTED
Tell Us About Your Product — Get a Plan in 48 Hours
Share a few details and a Codersarts AI engineer (not a salesperson) will reply within 48 hours with a scoped plan, a fixed price and a timeline. No commitment, NDA on request.
What happens after you submit
Within 48 hours: an engineer reviews your product or API docs
Day 2–3: you receive a written plan with scope, fixed price and timeline
Day 3–5: optional 30-minute call to finalise
Kick-off: work starts within a week of your go-ahead
BACKED BY CODERSARTS
More Ways Codersarts Supports Your AI Product
LLM Integration & API Orchestration — model routing and cost control
AI Copilot / Chatbot Development — AI assistants inside your app
MVP Development (build.codersarts.com) — new AI products from scratch
Hire Developers — dedicated full-stack developers
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RECOMMENDED READING
Recommended Reading
How to Add Sign in with ChatGPT to Your App
OpenAI DevDay 2026: What It Means for SaaS Companies
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