If you’ve been anywhere near OpenRouter or OpenCode in the last few days, you’ve probably noticed a new name floating around: Ox Alpha. No company has stepped forward to claim it, there’s no launch keynote, no pricing page with a logo on it — just a model ID, stealth/ox-alpha, and a lot of developers quietly putting it through its paces.
<cite index=”1-1″>Ox Alpha showed up as a free “stealth” model on OpenRouter and OpenCode on August 20, 2026, offering a 1M-token context window along with text, image, and video input.</cite> <cite index=”8-1″>It spread quickly into other coding-agent clients within a day of launch, and officially, nobody knows who’s behind it — though the technical evidence points fairly strongly toward Z.ai’s GLM family.</cite> I’ve spent the past few days running it through real work, and here’s what stood out.
First impressions: fast, and it feels different
The first thing I noticed was speed. Ox Alpha responds and completes tasks noticeably faster than the free models I’ve tried on OpenCode before, and it does so cleanly — no meandering, no half-finished output that needs three follow-up prompts to fix. It just gets to the point and does the job.
That’s a real contrast to most of the free-tier options available through OpenCode, which tend to feel sluggish or need a lot of hand-holding. Ox Alpha doesn’t.
A rough patch: occasional connection hiccups
It hasn’t been flawless. Over the weekend, using it from a machine in the US, I ran into intermittent network errors — the kind where a request just fails to go through, with no obvious cause. It’s worth noting that Ox Alpha is a stealth preview running through a single anonymous provider, not a distributed, load-balanced production service, so some instability during a free, high-demand launch window isn’t entirely surprising. Still, it’s the one thing that kept the experience from being completely smooth.
Where it really shines: WordPress plugin development
The most impressive part of my testing was using Ox Alpha for WordPress plugin development. Two things stood out:
- It remembers context. No “forgetting” what we were building halfway through a session — a common failure mode with other coding-agent-connected models where earlier decisions get lost as the conversation grows.
- It doesn’t hallucinate. Function names, hooks, and API usage stayed accurate and consistent, without the confident-but-wrong suggestions I’ve had to fact-check constantly with other models.
Given that <cite index=”1-1″>it’s marketed as a reasoning model built for coding and sustained agentic work</cite>, this tracks — sustained, multi-step coding tasks are exactly the scenario where memory and factual grounding matter most, and it held up.
How it compares
I’ve spent real time with Codex, GitHub Copilot, DeepSeek V4, LongCat, and Agnes (Anges), and in my own head-to-head experience, Ox Alpha is a clear step above all of them for this kind of coding work. It’s not a marginal improvement — the gap felt substantial, especially on longer, multi-turn tasks where the other models started losing the thread.
This lines up with some of the early chatter around the model. <cite index=”2-1″>Early benchmark tests reportedly showed it performing strongly on the DeepSWE coding benchmark, outpacing several other current models</cite>, and <cite index=”7-1″>Stripe CEO Patrick Collison tried it and called it “very impressive,” noting it’s positioned for coding, long-horizon agent work, and production use</cite>.
The catch: it’s a stealth preview, not a stable product
A few things are worth keeping in mind before you build a workflow around Ox Alpha:
- It’s temporary. <cite index=”3-1″>It’s free to use for roughly one week during this preview window</cite>, and <cite index=”8-1″>every previous stealth-model codename has followed the same pattern: it disappears, then eventually reappears under a real name with real pricing</cite>.
- Nobody’s confirmed who built it or how your data is handled. <cite index=”6-1″>Retention claims differ depending on how you access it — OpenCode’s announcement promotes zero data retention, while OpenRouter’s own listing is less specific</cite>, so it’s worth being cautious about what you paste into it. Don’t feed it credentials, customer data, or anything proprietary you wouldn’t want retained somewhere.
- The infrastructure is still shaking out. The network hiccups I saw over the weekend may just be growing pains from a sudden wave of demand hitting one anonymous provider’s servers.
Bottom line
For actual coding work — and WordPress plugin development in particular — Ox Alpha is, in my experience, the most capable free model currently available on OpenCode, and it beats several well-known paid and free alternatives I’ve used. Whether it stays free, gets a name, or quietly vanishes next week is anyone’s guess. But if you do coding work and haven’t tried it yet, this is the week to do it — just keep your sensitive data out of the prompt window while its identity and data policies remain unclear.
