Vercel puts stealth reasoning model Glyph Cluster free on AI Gateway for coding agents

Free during its stealth period for Pro and Enterprise teams with purchased AI Gateway credits, stealth/glyph-cluster is a text-only reasoning model for coding and long-context work that you can pick in Claude Code, Codex, or Cursor after running vercel ai-gateway setup. It has function calling but no structured outputs or image input, and there's no zero data retention, so your prompts and responses may be used for training.