hermes-agent/website/docs/guides/xai-grok-oauth.md

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16	xAI Grok OAuth (SuperGrok Subscription)	Sign in with your SuperGrok subscription to use Grok models in Hermes Agent — no API key required

xAI Grok OAuth (SuperGrok Subscription)

Hermes Agent supports xAI Grok through a browser-based OAuth login flow against accounts.x.ai, using your existing SuperGrok subscription. No XAI_API_KEY is required — log in once and Hermes automatically refreshes your session in the background.

The transport reuses the codex_responses adapter (xAI exposes a Responses-style endpoint), so reasoning, tool-calling, streaming, and prompt caching work without any adapter changes.

The same OAuth bearer token is also reused by every direct-to-xAI surface in Hermes — TTS, image generation, video generation, and transcription — so a single login covers all four.

Overview

Item	Value
Provider ID	xai-oauth
Display name	xAI Grok OAuth (SuperGrok Subscription)
Auth type	Browser OAuth 2.0 PKCE (loopback callback)
Transport	xAI Responses API (codex_responses)
Default model	grok-4.3
Endpoint	https://api.x.ai/v1
Auth server	https://accounts.x.ai
Requires env var	No (XAI_API_KEY is not used for this provider)
Subscription	SuperGrok (any active tier)

Prerequisites

• Python 3.9+
• Hermes Agent installed
• An active SuperGrok subscription on your xAI account
• A browser available on the local machine (or use --no-browser for remote sessions)

Quick Start

# Launch the provider and model picker
hermes model
# → Select "xAI Grok OAuth (SuperGrok Subscription)" from the provider list
# → Hermes opens your browser to accounts.x.ai
# → Approve access in the browser
# → Pick a model (grok-4.3 is at the top)
# → Start chatting

hermes

After the first login, credentials are stored under ~/.hermes/auth.json and refreshed automatically before they expire.

Logging In Manually

You can trigger a login without going through the model picker:

hermes auth add xai-oauth

Remote / headless sessions

On servers, containers, or SSH sessions where no browser is available, Hermes detects the remote environment and prints the authorization URL instead of opening a browser. Open the URL on any device with a browser, complete the consent flow, and Hermes finishes the loopback exchange when the redirect comes back.

If you need to force this behaviour explicitly:

hermes auth add xai-oauth --no-browser

How the Login Works

1. Hermes opens your browser to accounts.x.ai.
2. You sign in (or confirm your existing session) and approve access.
3. xAI redirects back to Hermes and the tokens are saved to ~/.hermes/auth.json.
4. From then on, Hermes refreshes the access token in the background — you stay signed in until you hermes auth remove xai-oauth or revoke access from your xAI account settings.

Checking Login Status

hermes doctor

The ◆ Auth Providers section will show the current state of every provider, including xai-oauth.

Switching Models

hermes model
# → Select "xAI Grok OAuth (SuperGrok Subscription)"
# → Pick from the model list (grok-4.3 is pinned to the top)

Or set the model directly:

hermes config set model.default grok-4.3
hermes config set model.provider xai-oauth

Configuration Reference

After login, ~/.hermes/config.yaml will contain:

model:
  default: grok-4.3
  provider: xai-oauth
  base_url: https://api.x.ai/v1

Provider aliases

All of the following resolve to xai-oauth:

hermes --provider xai-oauth        # canonical
hermes --provider grok-oauth       # alias
hermes --provider x-ai-oauth       # alias
hermes --provider xai-grok-oauth   # alias

Direct-to-xAI Tools (TTS / Image / Video / Transcription)

Once you're logged in via OAuth, every direct-to-xAI tool reuses the same bearer token automatically — there is no separate setup unless you'd rather use an API key.

To pick a backend for each tool:

hermes tools
# → Text-to-Speech       → "xAI TTS"
# → Image Generation     → "xAI Grok Imagine (image)"
# → Video Generation     → "xAI Grok Imagine"

If OAuth tokens are already stored, the picker confirms it and skips the credential prompt. If neither OAuth nor XAI_API_KEY is set, the picker offers a 3-choice menu: OAuth login, paste API key, or skip.

:::note Video generation is off by default The video_gen toolset is disabled by default. Enable it in hermes tools → 🎬 Video Generation (press space) before the agent can call video_generate. Otherwise the agent may fall back to the bundled ComfyUI skill, which is also tagged for video generation. :::

Models

Tool	Model	Notes
Chat	grok-4.3	Default; auto-selected when you log in via OAuth
Chat	grok-4.20-0309-reasoning	Reasoning variant
Chat	grok-4.20-0309-non-reasoning	Non-reasoning variant
Chat	grok-4.20-multi-agent-0309	Multi-agent variant
Image	grok-imagine-image	Default; ~5–10 s
Image	grok-imagine-image-quality	Higher fidelity; ~10–20 s
Video	grok-imagine-video	Text-to-video and image-to-video; up to 7 reference images
TTS	(default voice)	xAI /v1/tts endpoint

The chat catalog is derived live from the on-disk models.dev cache; new xAI releases appear automatically once that cache refreshes. grok-4.3 is always pinned to the top of the list.

Environment Variables

Variable	Effect
XAI_BASE_URL	Override the default https://api.x.ai/v1 endpoint (rarely needed).
HERMES_INFERENCE_PROVIDER	Force the active provider at runtime, e.g. HERMES_INFERENCE_PROVIDER=xai-oauth hermes.

Troubleshooting

Token expired — not re-logging in automatically

Hermes refreshes the token before each session and again reactively on a 401. If refresh fails with invalid_grant (the refresh token was revoked, or the account was rotated), Hermes surfaces a typed re-auth message instead of crashing.

Fix: run hermes auth add xai-oauth again to start a fresh login.

Authorization timed out

The loopback listener has a finite expiry window (default 180 s). If you don't approve the login in time, Hermes raises a timeout error.

Fix: re-run hermes auth add xai-oauth (or hermes model). The flow starts fresh.

State mismatch (possible CSRF)

Hermes detected that the state value returned by the authorization server doesn't match what it sent.

Fix: re-run the login. If it persists, check for a proxy or redirect that is modifying the OAuth response.

Logging in from a remote server

On SSH or container sessions Hermes prints the authorization URL instead of opening a browser. Open the URL on any device with a browser and complete the consent there — the loopback callback comes back to your remote host.

You can also force this behaviour:

hermes auth add xai-oauth --no-browser

"No xAI credentials found" error at runtime

The auth store has no xai-oauth entry and no XAI_API_KEY is set. You haven't logged in yet, or the credential file was deleted.

Fix: run hermes model and pick the xAI Grok OAuth provider, or run hermes auth add xai-oauth.

Logging Out

To remove all stored xAI Grok OAuth credentials:

hermes auth logout xai-oauth

This clears both the singleton OAuth entry in auth.json and any credential-pool rows for xai-oauth. Use hermes auth remove xai-oauth <index|id|label> if you only want to drop a single pool entry (run hermes auth list xai-oauth to see them).

See Also

• AI Providers reference
• Environment Variables
• Configuration
• Voice & TTS