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Public story · 2026-08-26 · high
Ox Alpha, the OpenRouter model that more than doubled DeepSeek's usage before Z.ai claimed it, ships open weights tonight.
Why now: Z.ai confirmed authorship to Bloomberg on August 26, ending a guessing game that had run since the weekend.
Ox Alpha showed up on OpenRouter over the weekend with no listed creator. Usage more than doubled DeepSeek's within days, making it the platform's biggest launch with no name attached.
The mystery drew a crowd. A DeepMind researcher guessed Gemini. A browser-based fingerprinting tool pointed at the GLM family at six of nine probes.
On August 26, Z.ai told Bloomberg it built Ox Alpha as a new GLM-series iteration, with open weights going out tonight. On OpenRouter it's listed as stealth/ox-alpha, a reasoning model for coding and agentic work with a 1,048,576-token context window. Pricing for prompts and completions is zero, and it takes text, image and video input.
The number I trust here comes from a repo test, not a leaderboard score. Cline ran Ox Alpha and Fable on the same bug from its own codebase, and both fixed it. Ox Alpha used far fewer thinking tokens to get there.
Cline's test thread noted that Fable announced it had found the root cause seven separate times before it acted on the fix. That's a measured cost difference from real use.
Don't take fewer reasoning loops as proof of better reasoning. A thread on r/singularity raised the fair objection that committing to a first conclusion faster can also mean skipping edge cases.
The "80% coding score" that circulated last week dropped to 58.4% once someone ran the full evaluation. Any single number tied to this model deserves a second look once the weights are public.
If the weights ship tonight as promised, this becomes the cheapest way to test long-context agentic workflows. The free OpenRouter listing and million-token context remove the cost excuse most people have used to skip that test. Pin the exact model string before you test, since free stealth listings on OpenRouter don't usually stay free.
Each link below shares sources, entities, or timing with this story.
Ox Alpha competes with DeepSeek / Shared entities / Shared topic / Earlier coverage
Linked by a graph relationship (Ox Alpha competes with DeepSeek); both cover DeepSeek, Gemini, GLM; overlapping topics (against, agentic, coding, model, weight).
OpenRouter released Ox Alpha / Shared entities / Shared topic / Earlier coverage
Linked by a graph relationship (OpenRouter released Ox Alpha); both cover OpenRouter, Ox Alpha; overlapping topics (agentic, alpha, coding, free, model).
Ox Alpha competes with DeepSeek / Shared entities / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Ox Alpha competes with DeepSeek); both cover DeepSeek, Gemini, GLM; overlapping topics (against, model, reasoning).
OpenRouter released Ox Alpha / Shared entities / Shared topic / Earlier coverage
Linked by a graph relationship (OpenRouter released Ox Alpha); both cover Fable, GLM, OpenRouter; overlapping topics (agentic, coding, model, openrouter).
Ox Alpha competes with DeepSeek / Shared entities / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Ox Alpha competes with DeepSeek); both cover DeepSeek, GLM, Ox Alpha; overlapping topics (against, alpha).
OpenRouter released Ox Alpha / Shared entities / Shared topic / Earlier coverage
Linked by a graph relationship (OpenRouter released Ox Alpha); both cover GLM, OpenRouter, Ox Alpha; overlapping topics (alpha, coding, context).
Ox Alpha competes with DeepSeek / Shared entities / Earlier coverage
Linked by a graph relationship (Ox Alpha competes with DeepSeek); both cover Cline, DeepSeek, Gemini, GLM; earlier Cline coverage from 2026-07-20.
OpenRouter released Ox Alpha / Shared entities / Earlier coverage
Linked by a graph relationship (OpenRouter released Ox Alpha); both cover DeepSeek, Fable, Gemini, OpenRouter; earlier DeepSeek coverage from 2026-06-15.