Stealth AI with million context shows up FREE to beat giants

A mysterious stealth AI model has created a buzz across the AI community after quietly appearing on OpenRouter. Ox Alpha, listed as stealth/ox-alpha, arrived without a publicly identified developer, yet early coding tests have produced eyecatching results. It offers a 1,048,576 token context window, accepts text, image and video input, and is currently free during its preview, reportedly until August 27, 2026.

Try Ox Alpha on OpenRouter to see how it performs. OpenRouter provides browser access as well as an OpenAI compatible API, making it possible to use the model with coding agents and other tools. The listing currently shows $0 for input and output, although preview pricing and availability may change.

Why DeepSWE matters

DeepSWE tests AI agents on real software engineering work rather than simple coding questions. It contains 113 tasks across 91 opensource repositories and five programming languages, with verification designed to establish whether the proposed changes actually solve each problem.

*These figures come from a 10 task only test, not full DeepSWE evaluations.

Who tested Ox Alpha?

The widely circulated comparison was conducted by Ben Davis, who tested Ox Alpha on 10 DeepSWE tasks and reported that it completed eight successfully. Importantly, Davis himself noted that such a small sample can have high variance. That distinction matters: the 80% figure is an independent early result, not an official full benchmark score. Readers can follow the tester's report and judge the methodology for themselves.

What does OpenRouter offer?

Besides direct browser testing, OpenRouter lets users access Ox Alpha through its API and connect it with coding environments. For now, the combination of a million token context, multimodal capability and free access makes Ox Alpha an interesting model to experiment with.