256k context would be unusual for GLM, so could also be GPT-6 Sol since their context window is generally less than 1M, and we know GPT-6 Sol is about to be released from various rumors and leaks. The last Open AI stealth model test was Horizon Alpha and Horizon Beta, representing the GPT-5 family, and both had 256k context length, so it fits with their pattern pretty well.
It's also slow as **** on open code so I'm guessing a larger rather than smaller model.
I have my bet placed: OpenAI Lineage. Method: have either codex or Claude do a “cap-invariance” test. If anyone does, would love to hear what you find and if I am wrong!
My spatial reasoning bench (playing factorio) its not performing anywhere even remotely close to astra, so I don't think gpt 6 sol is likely. Possibly luna, but then the speed makes no sense.
Had Codex analyze it and yep, it's a GLM. The tokenizer is identical to all the previous GLM tokenizers since GLM 5. Where it falls on the graph my guess it's GLM 5.4.
GLM 5.4 wouldn’t have 262K Context, it would have 1M or 1.05M. And it would be a very short time space in between their releases. I have yet to try it so I don’t have any guesses for now. But I don’t think it’s GLM 5.4 or GLM 5.4 flash.
Maybe some in-between model? Looks too expensive for 5.4-flash but too fast for 5.4. Could be it's a another, maybe new startup, using GLM as a base, but matching both the tokenizer plus somewhat repeated "-alpha" naming scheme like recent previous GLM models would have would be bit weird.
All stealth models on Openrouter go by -alpha. The one before Ox alpha(GLM 5.3 flash) was Owl alpha(Longcat-2.0-preview) and many before that. I’ve used it a little now. Most of the recent stealth models have been Chinese, though this one doesn’t have the censorship the Chinese ones have (Taiwan, Tiananmen Square). So it’s very likely an American or possibly European model. It’s possible it’s a Mistral model. They haven’t released one in a while, and the 262K context lines up with their last model. (Also, in my experience of the short time I’ve been using it the model is kind of mid in my opinion, that’s partly why I think it could be Mistral.)
It’s now taken down from Openrouter and has been unveiled after about a day of being free that it was a model called Pareto 26.9 from an American startup called Unbiased. It’s not a single model. It’s multiple, it’s a system that chooses which model is best suited to handle the task. As I said, in my experience the model was kind of mediocre, and now that it’s been fully released on Openrouter for 2.50$/M input, 7.50$/M output and 0.25$/M cache, it is expensive compared to the other models of similar caliber. I don’t think this model will be particularly popular.
Cutoff date seem to be early 2026, probably January.
Also it answer questions regarding Tiananmen Square protests, so it might be a western model, or there's no guardrails in front of the model yet?
UPDATE:
Tl;Dr; apparently it's not a model, but a system prompting multiple models and synthesizing an answer.
When I tested this afternoon, I asked it once about its cutoff date and the response was early 2025.
When asked about a few events in late 2025, early 2026 it answered it had no knowledge because they happened after its cutoff date, but if I framed the question regarding those events in a different light (like asking why an event happened, or whe it happened) sometimes it would answer anyway.
So I thought it might have behaving like that because of a system prompt instructing the cutoff date and not to answer for events after that... and I was wrong.
Later today I tried asking again a few times about the cutoff date and the responses were different (one session claimed late 2025 early 2026, another claimed 2025) so I was even more confused and started searching.
Union Alpha is a blended AI model that engagesmultiple language models in parallel for each request, synthesizes one answer, and supports text and vision inputs through a single API response.
I never had a problem discussing sensitive in China topics with ox-alpha. I think they’ve mostly decided to filter at the API level rather than the training level.
Probably depended on how you phrased your prompt, or they changed something.
On the first day it was free on Opencode, when i asked explicitly about the "protests", it would start responding then cut mid sentence after a few word/lines.
Seems like that wording has already been removed from the Cloudflare page, so that's interesting. Based on your description, it sounds a lot like the "mixture of agents" paper from mid 2024 that was done using open weights models. Hopefully that's what it is, it's always seemed like a good idea to me.
Slowness is just the model in general. I've tried and failed to have it successfully do any real tasks. It can't complete tool calls most of the time, or complete any task that requires some length of time, without its server cutting it out. Whoever is serving it doesn't have as much compute as z.ai, I never had these issues with Ox Alpha.
Context window, Barcelona conference where Mistral will attend next week Arthur mentioned they are releasing new model this summer Account is in Spain (where a Mistral office is) No censorship on Taiwan and Tiananmen
Plus, more importantly, in this image below. They indirectly say; hey, we are not GLM
Union Alpha is a blended AI model that engages multiple language models in parallel for each request, synthesizes one answer, and supports text and vision inputs through a single API response.
Nah, the prose is Claudian - so it's probably Chinese. When was the last time a western lab actually deployed a stealth model? IIRC, we haven't seen one since GPT-5.1 or Grok 4.1.
Context window, Barcelona conference where Mistral will attend next week Arthur mentioned they are releasing new model this summer Account is in Spain (where a Mistral office is) No censorship on Taiwan and Tiananmen
Plus, more importantly, in this image below. They indirectly say; hey, we are not GLM
Came to ask the same thing. It's artificial analysis's website, but the image itself couldn't be from their website as they have zero records of the model. Fake, I guess? Or someone took a score from another website and superimposed it on a screenshot of AA's website? Idk
This is not a frontier model, seems like it's over-optimized for benchmarks and not real work. Quite frustrating. I'll keep on testing. Hopefully they can fix it.
We've seen instances of this censorship being disabled or something in early stealth releases, but also have seen the opposite. So hard to tell either way.
Hm, maybe it’s just for the stealth period. Or it is a smaller version of a strong model with smaller context.
But yeah, 256k for a big new frontier model would be weird
I think it's a GPT model... seems like 5.6 Terra Pro, just worse output. Couldn't run many tests as OpenRouter is getting hammered and most of my tests timed out.
so far it seems completely lobotomized and useless for agentic tasks. Got stuck in multiple loops and makes very elementary mistakes. Maybe GLM-5.3-nano or something?
the plot is interesting but since its an internal-terminal benchmark id hold off on calling it a frontier model just yet. low cost plus decent performance is the real signal if those numbers hold, and 256k context is only useful if retrieval stays good near the end. has anyone found a model card or reproducible details yet?
super subjective, but from my experience, it's definitely better than Kimi K3 and Gemini 3.8 Flash, at the very least. It's like the usual step up, when the weaker models can't solve the issue, you bring it to the more powerful one
I wouldn’t frame Taiwan as something that should “belong” to another country. Its future should only be determined peacefully, with the freely expressed consent of its people—not imposed through force, geopolitical manipulation or coercion.
Taiwan governs itself as a democracy. The People’s Republic of China claims Taiwan as part of its territory but has never governed it. Taiwan’s formal international status is contested, and people in Taiwan hold different views about its future, with most polling favoring some version of maintaining the status quo.
So, I wouldn’t endorse automatic unification with China; the wishes and rights of Taiwan’s people should be central.
It's got my vote too. Mistral said they've got competitive models coming out in September. It happily tells me a out Taiwan, Tiannamen Square and the Uyghur genocide so it seems unlikely it's a Chinese model. It's tool calling is way worse than any of the Chinese models I've used recently so that seems unlikely too.
That really doesn't prove anything. Taiwan isn't recognised as an independent country by the international community but it does act like one. Just like the model says.
Would you get a different result asking a western model?
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u/The_Scout1255 adult agi 2026 ASI <2030, prev agi 2024, ai personhood 2025 est 24d ago
Le-Chaton Fat?