An anonymous provider has been handing out free access to a frontier-class coding model on OpenRouter Inc. since Aug. 20, and no company has admitted to building it. The model is listed as “Ox Alpha” and costs nothing for input or output tokens. OpenCode, an open-source terminal agent, debuted the model on the same day and advertised capacity of 100 trillion tokens a day. Rate limits there were described as near unlimited. OpenRouter told users in an email that free access on its route runs through Monday, Aug. 24. OpenCode’s launch note promised a week from Aug. 20, which points to about Aug. 27. The model’s context window runs to 1,048,576 tokens and output caps at 131,072 tokens. The model takes text, images and video. Audio requests come back rejected. OpenRouter’s listing pitches it as a reasoning system for long-horizon software engineering and sustained agentic work. Early scores got the attention. Ben Davis, a developer posting as @davis7, ran the model through 10 tasks on the DeepSWE software engineering benchmark and scored it above 80%. Claude Fable 5 managed 65% on the same tasks. GPT-5.6-sol got 52%. Davis flagged the sample size himself, warning that a subset that small carries a lot of variance.

Full report : Nobody knows who built AI coding model Ox Alpha or where the code goes.