# Glyph Cluster

> Glyph Cluster is a reasoning model designed for coding and long-context workloads. It is a stealth preview model from a third-party provider who has chosen to remain anonymous during this preview. Free during stealth for Pro/Enterprise Vercel users. Text-only input; function calling supported; no structured outputs; no ZDR (prompts may be used for training).

**ID**: `stealth/glyph-cluster`  
**Creator**: stealth  
**Category**: text  
**Context**: 256K tokens  
**Pricing**: BYOK — billed by your provider  
**Released**: 2026-10-07  
**Web page**: https://anyrouter.dev/model/stealth/glyph-cluster

**Input modalities**: text  
**Output modalities**: text  

**Capabilities**: chat, streaming, function-calling, reasoning

**Supported parameters**: messages, model, prompt, stream, max_tokens, max_completion_tokens, temperature, top_p, tools, tool_choice, reasoning_effort, stop

## Usage

**Endpoint**: `POST https://anyrouter.dev/api/v1/chat/completions`

```bash
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": "Say hi in 3 words."
    }
  ]
}'
```

## Providers

| Provider | Input | Output |
| --- | --- | --- |
| vercel-byok | BYOK — billed by your provider | — |

BYOK routes are billed by your own provider key — AnyRouter charges $0. Rates marked (list) are the provider's published list price.

## Source

- Upstream docs: https://vercel.com/changelog/glyph-cluster-is-now-available-in-stealth-for-free-on-ai-gateway