Sign in with ChatGPT: Users Can Spend Their Plan in Your App

Sign in with ChatGPT can let a user bring eligible plan usage into a participating app. For builders, the key decision is how the app behaves when that allowance is unavailable or exhausted. Authentication, consent to use an allowance and access to your own product should each remain understandable to the user.

Written October 1, 2026 and dated September 29, 2026, using the dated announcements cited below. Later product developments are outside this article’s scope.

OpenAI’s DevDay recap announces plan usage across 16 partners, including Devin, Notion, Vercel, T3, OpenClaw and Dactyl. Identity is offered globally; the recap names Plus and Pro for plan usage in participating tools. The plan-sharing help page distinguishes supported open-source integrations from eligible commercial apps. These are eligibility conditions, not a universal entitlement for every app.

A user bringing an AI allowance does not automatically remove the commercial relationship between the user and your product. Your application may still have its own service, storage and support costs. Explain those separately from the model usage, and avoid describing the entire product as free merely because one cost can be covered by an existing subscription.

The announcement does not establish revenue-sharing terms. A business case should use confirmed participation and billing conditions rather than inventing a payment from the model provider to the app developer.

The help page separates basic identity information from plan-use consent. Sharing a plan does not itself grant access to ChatGPT conversations or memories and does not hand the app an OpenAI API key. App-level weekly caps consume the existing allowance; they do not create or reserve a separate pool. These details come from the implementation guidance read October 1.

A good product flow should remain intelligible when the user accepts one decision and declines another. Someone may want an easier login without sharing plan usage. Another user may have an eligible plan but lack access to a paid feature in your app. Avoid a single success message that obscures which permissions were actually granted.

Use a stable account-linking policy to prevent surprises. If the user already has an account under a different address, explain how linking works before creating a duplicate. The important product behavior is predictable ownership of saved work, regardless of which login method the user selects.

Treat allowance exhaustion as an expected state. Preserve the user’s draft, explain why a task paused and show the available next step. Do not repeatedly retry an expensive operation while presenting an indefinite spinner. If your app offers another billing path, that is a separate choice with a clearly stated cost.

The help page describes optional credit continuation where available, disabled by default and subject to additional conditions. Do not equate a high app cap with authorization to spend credits. Your interface should reflect the actual consent state returned by the integration, rather than assuming that a user who permitted plan usage also permitted every form of paid continuation.

Test the limit path before launch, not after the first support complaint. Use a task that can safely stop and resume. Verify that the app does not lose the input, duplicate an output or bill a different funding source without the intended decision.

For a pilot, separate the costs you continue to own from usage covered through the user’s plan. Hosting, storage, third-party tools, support and failed-task handling may remain your responsibility. Track the cost of an accepted outcome instead of treating one covered model call as the cost of the whole workflow.

Our model-routing guide explains that task-level view. The Agents API guide covers a different integration route; do not assume subscription-backed usage and API billing are interchangeable contracts. The DevDay preparation article places these choices in the wider release context.

Decide what your app will do if participation conditions change. A clear fallback could be a user-selected API arrangement or a limited read-only mode, where supported by your product and terms. That is a design contingency, not a claim that OpenAI guarantees either route.

Before treating plan sharing as a pricing advantage, verify eligibility and walk through sign-in, consent, revocation, exhaustion and recovery. Each state should preserve the user’s understanding of who is paying and what work can proceed. Our AI transformation service helps teams test those boundaries in practical applications.

The guide separates identity, allowance and product because the integration makes them easy to merge into one success screen. The illustrative apps below each merge two. They are design examples drawn from the help page’s own distinctions, not products we have reviewed.

Each app collapsed a decision the user should have seen into one they did not. The record in the next section writes each state down with the message the user sees and the funding source it names.

Illustratively, the four would also surface in roughly this order. A user who was never asked for consent is likely to notice first, when the allowance they did not knowingly share runs down; a user who read the cap as the app’s own usage notices when it stops early; a user who read the product as free notices when the app’s own subscription appears; and a business case built on an invented revenue share tends to surface at a finance review. Designing the three decisions as three visible steps addresses the first three before they become complaints, and confirmed terms address the fourth.

The decision section asks for sign-in, consent, revocation, exhaustion and recovery to be walked through before plan sharing is treated as a pricing advantage, and a record per state is the walk written down. For each state: no usage consent, ineligible plan or tool, allowance exhausted, consent revoked, credit continuation unavailable or disabled, and the happy path. The behaviour the app shows: whether sign-in still works, whether the draft is preserved, what pauses and what proceeds. The message the user sees, stating which permission is missing or which limit was reached without promising an automatic alternative. The funding source the interface names at that moment, so the user can tell signing in from spending an allowance from buying the product. And the test performed: the task used, which can safely stop and resume, and the confirmation that input was kept, output was not duplicated and no other funding source was billed without the intended decision.

An illustrative record for a writing assistant reads: no consent, sign-in works and the editor opens with the AI features labelled as needing plan permission; ineligible, the limitation stated with the app’s own subscription offered as a separate choice with its price; exhausted, the draft preserved, the task paused with the reason shown and the next step offered; revoked, features disabled at the next request with the saved work intact; credit continuation, shown as off by default and never implied by the cap; happy path, the consent state read from the integration and reflected in the interface. Each tested with a stoppable summarisation task on a stated date.

The record is also what the economics section needs. Beside each state sits the cost the app still owns in it, which turns the pilot’s question from whether one model call was covered into what an accepted outcome costs across the states users actually reach.