Free Union Alpha API
Updated 9/25/2026
Stealth multimodal model built for research, coding, and agentic workflows with 256K context and 128K max output.
About the Model
为什么选择 Union Alpha？
Union Alpha 是首发于 OpenRouter、OpenCode 与 Cloudflare AI Gateway 的全新匿名多模态测试大模型，专为学术研究、复杂代码重构与智能体工作流量身打造。在提供对标 Codex 的 256K 输入上下文的同时，罕见地开放了高达 128K 的单次最大生成长度，配合原生多模态视觉与 Tool Calling，彻底解决写长代码被截断的痛点。
核心优势与能力
- 对标 Codex 的 256K 上下文：兼顾代码检索命中率、注意力聚焦与低推理时延。
- 罕见的 128K 单次最大输出：一口气生成完整大型模块与成套测试用例，拒绝代码截断。
- 原生多模态视觉排障：支持直接输入 UI 设计稿、报错日志截图与数据库架构图分析。
- 标准 Tool Calling 支持：规范遵循函数定义，生成高质量结构化 JSON，专为智能体打造。
- 多平台同步公测：OpenRouter、OpenCode 与 Cloudflare AI Gateway 同步开放，限时免费 0 元畅享。
Try it in your browser
Pick a model, paste your own free key, and run. Your key is sent once to call the provider and never stored on our servers.
Pick a model, paste your own free key, and run. Your key is sent once to call the provider and never stored on our servers.
How to call Union Alpha
curl https://gateway.ai.cloudflare.com/v1/{account_id}/{gateway_id}/openrouter/v1/chat/completions \
-H "Authorization: Bearer $OPENROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "stealth/union-alpha",
"messages": [
{
"role": "user",
"content": "Hello Union Alpha from Cloudflare AI Gateway!"
}
]
}'Compare Free Providers
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