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Open-Source Vercel AI SDK Provider Uses ChatGPT Subscription for Auth

July 8, 2026 at 13:45 EDT

Open Source
Software Dev & Coding
AI Agents

An open-source Vercel AI SDK provider, ai-sdk-provider-chatgpt-oauth, lets developers authenticate with a paid ChatGPT subscription via OAuth and call gpt-5-class models without an API key. The GitHub repository was published around September 16, 2025 and is distributed under the MIT license. According to the developer, the implementation was built by a 15-year-old.

Sep 16, 2025 · Open Source · MIT

Call gpt-5 With Your ChatGPT Subscription — No API Key

A new open-source Vercel AI SDK provider, ai-sdk-provider-chatgpt-oauth, authenticates a paid ChatGPT plan via OAuth to reach gpt-5-class models — reportedly built by a 15-year-old.

API keys required — auth via ChatGPT OAuth

Supported models (gpt-5 family only)

200k

gpt-5 context / 100k output tokens

Auth Flow: Subscription → Model

codex login

ChatGPT Plus / Pro / Teams

→

auth.json

Server-side token, auto-refresh

→

provider('gpt-5')

generateText / streamText

Well suited for

Code generation with gpt-5 / gpt-5-codex
CLI automation & developer workflows
Full streaming (SSE), reasoningEffort control
Token usage tracking, TypeScript support

Documented limits

No arbitrary function calling (shell + update_plan only)
No structured output (generateObject / streamObject)
o3, gpt-4o, gpt-4.1 → "Unsupported model"
temperature / topP / maxTokens fixed or unsupported

Bottom line: The provider coexists and switches easily with the official @ai-sdk/openai provider — use this for code and CLI work, keep the standard provider for apps that lean on structured output.

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