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Glyph Cluster (stealth)

A stealth reasoning model for coding and long-context work, 256k context, via Vercel AI Gateway BYOK.

stealth/glyph-cluster is a stealth preview reasoning model built for coding and long-context workloads. Its provider has chosen to stay anonymous during the preview.

It takes text only, supports function calling, and has a 256,000-token context window. It does not support structured outputs and has no zero data retention: prompts may be used for training. Vercel lists it free during the stealth period for Pro and Enterprise Vercel users.

Glyph Cluster is **BYOK-only** through a Vercel AI Gateway key. Add the key under Dashboard → BYOK; the request goes out with your key and the provider bills you at its own rates. AnyRouter charges nothing for a BYOK route.

Try it in the Vercel AI SDK (guide). 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/glyph-cluster"),
  prompt: "Review this function and suggest a safer version.",
})
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/glyph-cluster",
  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/glyph-cluster","messages":[{"role":"user","content":"Hello"}]}'

Or launch a coding agent through the anyr CLI (Claude Code · OpenCode):

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

More: AI SDK · OpenAI SDK · coding agents · BYOK setup.

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