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Union Alpha now on AnyRouter

Stealth preview Union Alpha joins the catalog free — multimodal research, coding, and agentic workflows at $0.

stealth/union-alpha is Union Alpha, a stealth preview multimodal model for research, coding, and agentic workflows. 262K context, 131K max completion, vision in and text out, tools. Catalog price is $0 / $0. OpenRouter does not advertise reasoning on this SKU. Distinct from the retired stealth/ox-alpha tombstone.

Union Alpha on AnyRouter — anyr claude --model stealth/union-alpha

Try it in the Vercel AI SDK. createAnyRouter() reads ANYROUTER_API_KEY:

import { createAnyRouter } from "@anyr/ai-sdk-provider"
import { generateText } from "ai"

const anyrouter = createAnyRouter()

const { text } = await generateText({
  model: anyrouter("stealth/union-alpha"),
  prompt: "Summarize this diff in three bullets.",
})
console.log(text)
generateText with the catalog id.

Already on the OpenAI SDK? OpenAI SDK playbook:

OpenAI-compatible: SDK or curl.
import OpenAI from "openai"

const client = new OpenAI({
  baseURL: "https://anyrouter.dev/api/v1",
  apiKey: process.env.ANYROUTER_API_KEY,
})

const res = await client.chat.completions.create({
  model: "stealth/union-alpha",
  messages: [{ role: "user", content: "Hello" }],
})
console.log(res.choices[0]?.message.content)
curl https://anyrouter.dev/api/v1/chat/completions \
  -H "Authorization: Bearer $ANYROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"stealth/union-alpha","messages":[{"role":"user","content":"Hello"}]}'

Or launch a coding agent through the anyr CLI:

Coding agents via the AnyRouter CLI.
curl -fsSL https://anyrouter.dev/setup.sh | bash
anyr login
anyr claude --model "stealth/union-alpha"
curl -fsSL https://anyrouter.dev/setup.sh | bash
anyr login
anyr opencode --model "stealth/union-alpha"
curl -fsSL https://anyrouter.dev/setup.sh | bash
anyr login
anyr codex --model "stealth/union-alpha"

More: AI SDK · OpenAI SDK · coding agents.

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