Anonymous AI model Ox Alpha tops coding benchmarks

An anonymous AI model appeared on the developer platform OpenRouter on August 20, 2026, with no company name attached, a million-token context window, and early benchmark results that have the AI community scrambling to identify its creator. The model, listed under the identifier "stealth/ox-alpha," is free for one week and has already outperformed established frontier models on a demanding software engineering test.

Benchmark Results Stun Developers

Developer Ben Davis ran Ox Alpha through ten tasks from DeepSWE, a benchmark that measures an AI's ability to read real codebases, identify bugs, and produce working patches. The anonymous model scored around 80%, compared to 65% for Claude Fable 5 and 52% for GPT-5.6 Sol. Davis himself called the results confusing given the model's lack of provenance.pasqualepillitteri+1

The scores come with caveats. The sample size is small, and the models were tested with varying numbers of attempts. The public DeepSWE leaderboard does not yet list Ox Alpha, and the official snapshot still shows Claude Opus 5 leading at 73.6%. Independent verification on larger test suites remains pending.benchlm

A Million-Token Window, Zero Price Tag

OpenRouter's listing confirms the specifications: a 1,048,576-token context window, multimodal input across text, images, and video, and a maximum output of 131,072 tokens per response. The model is priced at zero during the preview period. OpenCode, a terminal-based coding agent, is also distributing it through its free tier and claims capacity for 100 trillion tokens per day.wccftech+2

The provider states that prompts and completions are retained but not used for training, though OpenCode's separate announcement promises zero data retention — a discrepancy developers have noted.officechai+1

Trail Points to Zhipu AI

The developer community's forensic work points to Zhipu AI, the Chinese lab behind the GLM model family, now also known as Z.ai. Tokenizer fingerprinting across 25 prompts found that Ox Alpha's token counts align almost exactly with GLM-5.3, off by a constant 75-token wrapper. Video encoder behavior and API response patterns further match Zhipu's architecture.cryptobriefing+2

This is the fifth anonymous model linked to Chinese labs to appear on OpenRouter in recent months. Previous stealth releases, including one called Pony Alpha, were eventually claimed by Zhipu after the preview period ended. A minority theory points to Xiaomi and its MiMo team, but the technical evidence favors Zhipu. As of August 21, no company has claimed the model.openrouter+1