xAI just handed its existing subscribers a free upgrade they probably weren't expecting. SuperGrok and X Premium subscribers can now use Grok directly inside OpenCode, a terminal-based coding agent, without needing a separate API key. If you're already paying for either subscription, you can now get AI coding assistance in OpenCode at no extra cost.
The most popular open-source coding agent just got a new model
OpenCode isn't a niche tool. It's the most-starred open-source coding agent on GitHub at over 172,000 stars (MIT license), with 75+ model providers and a client-server terminal UI. With over 900 contributors and more than 13,000 commits, OpenCode is used by over 7.5 million developers every month. That's the distribution network xAI just plugged into.
The model doing the work here is Grok Build -- the same model that powers xAI's own terminal-based coding agent. Grok Build ships with up to 8 parallel sub-agents, a 256K context window, and scored 70.8% on SWE-Bench Verified. For context, Opus 4.7 sits at 87.6% and GPT-5.5 at 88.7% on the same benchmark -- so Grok Build is competitive but not yet leading the pack on raw scores.
Getting started takes about two minutes
Install OpenCode, run /connect inside the tool, and pick xAI. Two sign-in flows are supported: a browser OAuth for standard setups, and a headless code-and-URL flow for SSH or remote hosts. That second option matters for anyone running agents on a VPS or inside a CI pipeline.
curl -fsSL https://opencode.ai/install | bash
opencode
# then inside OpenCode:
/connect
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