Source: What Is Union Alpha? OpenRouter's Free Stealth Model · platform: blog · authors: Cellcog · date: 2026-09-16
TL;DR（中文摘要）
2026-09-16 14:42 UTC，stealth/union-alpha 出现在 OpenRouter 目录：262144 token 上下文、131072 最大输出、图像输入、工具调用、价格 0，provider 字段只有 Stealth。十分钟后 OpenCode 宣布免费一周；OpenRouter CEO 随后贴出 Terminal-Bench 榜单金星图。Cellcog 把它作为活页记录维护：OpenRouter 公布的规格、发布帖声称的性能、数据条款原文（Stealth EULA：可能采集 User Content 用于训练）与身份线索。与 8 月 Ox Alpha 一样，揭晓时会在同一 URL 追加 resolution 章节。第三方 smhn 报道补充：OpenCode 图中其 Terminal-Bench 4.0 约 51%，接近 Claude Fable 5.1 high-with-fallback（约 52%）与 GPT-6 Astra high（约 54%），单任务成本标注为 anticipated pricing <2 美元。
Summary (English)
On Sep 16, 2026, stealth/union-alpha appeared in OpenRouter's catalog: 262,144-token context, image input, tool calling, $0 pricing, provider "Stealth". OpenCode announced a free week; the Terminal-Bench 4.0 chart puts it near Claude Fable 5.1 and GPT-6 Astra settings at under $2/task anticipated pricing. Cellcog maintains this living record of published specs, launch claims, the Stealth EULA data terms, and identity evidence, pledging a resolution section on the same URL when the reveal comes.
入库依据
cellcog.ai 文章全文（opencli web read 存档于本地 raw 笔记 cellcog-union.md 19.9KB）；Terminal-Bench 数字与数据条款矛盾点来自 smhn.info 同日报道全文（smhn-union.md）；Stealth EULA 原文（openrouter.ai/terms/stealth）本地存档 stealth-terms.md。
补充
Cellcog living record, published 2026-09-16, updated rolling. Companion raw captures: smhn.info/202609-union-alpha-free-terminal-bench (2026-09-17), openrouter.ai/terms/stealth (updated 2026-09-14).