Use Your ChatGPT or Codex Subscription in DeepSeek Harness

A very common DSH question: “I already pay for ChatGPT — can I use that subscription inside DeepSeek Harness instead of buying API credits?” Yes, with a bridge plugin. Here’s how.

The short answer

Plugins that reuse your ChatGPT / Codex subscription inside DSH exist:

• dsh-codex-connect — ChatGPT OAuth + Codex models for DSH
• dsh-llm-codex-oauth — use your ChatGPT/Codex subscription via the Codex OAuth flow
• dsh-codex-subscription by WSL043 — independent ChatGPT OAuth inside DSH; no API key or Codex CLI
• dsh-codex-subscription by yequ172672 — reuse your local Codex CLI login, no API key
• dsh-codex — use your ChatGPT subscription through OpenAI’s Codex sign-in
• dsh-llm-codebuddy — the WorkBuddy API route (if your company only provides WorkBuddy credits)

How it works

These plugins take one of two routes: some perform the ChatGPT / Codex OAuth sign-in inside DSH, while others reuse credentials from a local Codex CLI login. After authentication:

1. The plugin exposes the subscription as a model provider in DSH (e.g. codex-oauth).
2. Select it in the model picker.
3. Your prompts run against the subscription’s quota instead of a separate API key.

Install example:

dsh plugin add github:franksong2702/dsh-codex-connect

The WSL043 implementation installs from npm and does not require Codex CLI:

dsh plugin --profile web add dsh-codex-subscription

Which one fits you

Situation	Plugin
Want the simplest OAuth setup	dsh-codex-connect
Want independent OAuth, quota, search and image tools without Codex CLI	dsh-codex-subscription by WSL043
Already use Codex CLI locally	dsh-codex-subscription by yequ172672 — reuses the local login
Company only provides WorkBuddy credits	dsh-llm-codebuddy
Prefer the raw Codex OAuth flow	dsh-llm-codex-oauth

Things to check

• Your plan’s limits: subscription-based usage counts against your ChatGPT/Codex quota. Heavy agent loops can burn through it quickly.
• Terms: these plugins use the official OAuth flow, but check OpenAI’s terms for your plan before routing production work through it.
• Fallbacks: keep a standard API-key provider configured as a backup, and use model routing so simple questions go to a cheap model.

Related

• Model & Providers category — more provider bridges and model adapters.
• dsh-model-router — automatic fallback and cost optimization across providers.

Bottom line

If you already pay for ChatGPT or Codex, a bridge plugin removes the need for a separate API key — dsh-codex-connect is the fastest start. Just keep an eye on subscription limits during long agent runs.