--- title: "Union Alpha is now on StudyArena" slug: union-alpha-is-now-on-studyarena url: https://listedarticles.com/articles/union-alpha-is-now-on-studyarena canonical_url: https://studyarena.com/blog/union-alpha-is-now-on-studyarena content_type: announcement language: en published_at: 2026-09-17T05:03:44.000Z updated_at: 2026-09-17T23:17:24.239Z author: "Pasha Rayan" author_url: https://studyarena.com/blog/authors/pasha-rayan authored_by: human publisher: "StudyArena" publisher_url: https://listedstartups.com/companies/studyarena topics: ["AI", "LLMs", "Education", "Product", "Learning"] about: ["https://listedstartups.com/products/studyarena-platform"] license: all-rights-reserved word_count: 461 reading_minutes: 2 citation: "Pasha Rayan, StudyArena. \"Union Alpha is now on StudyArena.\" 17 Sept 2026. https://studyarena.com/blog/union-alpha-is-now-on-studyarena (all-rights-reserved)" # The full text follows. The web page shows an extract and sends readers # to the source above; quote the citation and link the canonical URL. --- # Union Alpha is now on StudyArena > Union Alpha is live on StudyArena. Try the stealth model in chat and blind comparisons, with text and image input and an undisclosed developer. # Union Alpha is now on StudyArena > Union Alpha is live on StudyArena. Try the stealth model in chat and blind comparisons, with text and image input and an undisclosed developer. ![Union Alpha is now on StudyArena, labelled as a stealth model with its provider undisclosed, above a chat card marked Available now.](https://studyarena.com/blog/heroes/union-alpha-is-now-on-studyarena-v2.png) Union Alpha is now available on StudyArena. You can select it in chat or compare its answers with other models in the arena. It is also included in random comparisons. Union Alpha is a stealth model. Its developer has chosen to remain anonymous during the preview. OpenRouter provides access to it, but is not its developer. We list its provider as “Provider undisclosed.”[1] The model accepts text and images and responds with text. You can ask it to explain a graph, check a calculation, review a piece of code, or work through a question from your notes. OpenRouter lists a context window of 262,144 tokens and a maximum output of 131,072 tokens. Those are the model's published limits. StudyArena applies its own limits to individual requests. The model also supports tools. We verified a text response and a calculator call through our integration before enabling it.[2] Union Alpha has one entry in our model list. OpenRouter does not currently offer configurable reasoning levels for it. Ordinary tool use is enabled on StudyArena. Our research mode is not enabled for this model yet. The useful next step is to compare its answers. Ask a question you understand well enough to judge. Look for a correct answer, a clear explanation, and support for any factual claims. In a blind arena comparison, you vote before seeing the model names. Union Alpha can receive votes and appear in the rankings under the same rules as other eligible models. There are two details to know about the preview. OpenRouter currently lists input and output tokens at zero cost; that is its provider pricing, and StudyArena's account limits still apply. The model page also says the provider may retain prompts and completions, but does not use them for training.[1][2] If the developer is disclosed later, we can update the name and attribution while keeping Union Alpha's existing comparison history. Stealth previews can also change or be withdrawn. You can [try Union Alpha in chat](https://studyarena.com/chat) or read its [model details](https://studyarena.com/models/union-alpha). ## Sources Sources are listed in citation order. Access dates show when StudyArena last checked each source. - 1.[Union Alpha model listing](https://openrouter.ai/stealth/union-alpha) · OpenRouter · Accessed September 17, 2026 - 2.[Union Alpha API endpoints and capabilities](https://openrouter.ai/api/v1/models/stealth/union-alpha/endpoints) · OpenRouter · Accessed September 17, 2026Update history - September 17, 2026 · Adjusted the announcement cover to keep the full title visible. - September 17, 2026 · Added the Union Alpha announcement cover image. - September 16, 2026 · Announcing Union Alpha on StudyArena.