Mysterious Model Ox Alpha Appears on OpenRouter, DeepSWE Benchmark Beats Claude — Fingerprints Point to Zhipu (GLM)

Forum topic · QianXun · 2026-08-23

Summary

OpenRouter quietly listed an anonymous model called Ox Alpha on August 20, offering free access for one week. Developer Ben Davis benchmarked it on DeepSWE, a suite that evaluates a model's ability to read real codebases, locate vulnerabilities, and produce working patches. Across ten tasks, Ox Alpha scored about 80%, compared with Claude Fable 5 at 65%, GLM-5.3 at 62%, Grok 4.6 at 62%, and GPT-5.6-sol at 52%. Listed specs include a 1,048,576-token context window, multimodal text/image/video input, a 131,072-token output limit, and free preview access. Coding-agent platform OpenCode also integrated it into a free tier claiming one quadrillion tokens per day. Researchers ran tokenizer fingerprinting across 25 prompts and found Ox Alpha's token counts almost identical to GLM-5.3, differing only by a constant 75-token wrapper. Video-encoder behavior and API response patterns also match Zhipu's architecture. The article, summarized from IT Home (2026/8/22), notes these clues collectively point to Zhipu as the likely origin.

Background

On August 20, OpenRouter — one of the largest AI model aggregation platforms — quietly listed an anonymous model called Ox Alpha, made free for one week. Its origin was undisclosed at launch.

DeepSWE Benchmark Results

Developer Ben Davis ran Ox Alpha against DeepSWE, a benchmark that measures an AI model's ability to read real-world codebases, locate vulnerabilities, and generate working patches.

Across ten tasks, Ox Alpha reached roughly 80%. Davis noted the result was hard to interpret given the model's unknown provenance.

| Model | DeepSWE average (10 tasks) | |---|---| | Ox Alpha (anonymous) | 80% | | Claude Fable 5 (max) | 65% | | GLM-5.3 (max) | 62% | | Grok 4.6 (xhigh) | 62% | | GPT-5.6-sol (max) | 52% |

Listed Specifications

Context window: 1,048,576 tokens
Input modalities: text, image, video
Max output: 131,072 tokens
Pricing: free during preview

The terminal coding-agent platform OpenCode also added Ox Alpha to its free tier, claiming daily capacity of 100 quadrillion tokens (1e17).

Fingerprint Analysis — Pointing to Zhipu

Investigators ran tokenizer fingerprinting across 25 prompts:

Ox Alpha's token counts were almost identical to GLM-5.3, differing only by a constant 75-token wrapper layer.
Video-encoder behavior aligned with Zhipu's architecture.
API response characteristics were consistent with Zhipu's stack.

These combined signals point toward Zhipu as the likely creator, though no party has officially confirmed it.

Source

Adapted from IT Home (2026/8/22): *《神秘 Ox Alpha AI 模型限免上架：DeepSWE 跑分碾压 Claude Fable 5，线索指向智谱》*.

Key Points

Anonymous model Ox Alpha launched free on OpenRouter; topped DeepSWE with ~80%.
Specs: 1M-token context, multimodal input, 131K-token output, free preview.
Tokenizer and API fingerprints closely match GLM-5.3, suggesting Zhipu as origin.