Glyph Cluster

Vercel's Changelog index for 7 October confirms Glyph Cluster as a new stealth model available for free on AI Gateway under one API key, alongside Step 5 Preview, OpenAI Decisions, and Claude Haiku 5.5 additions. Entry credits Kevin Dawkins and Zachary Chen, framing the release as part of a broader AI Gateway model expansion that week. The page reiterates the gateway-side onboarding pattern used for other stealth drops: no provider account required, with spend tracking and request traces included. Glyph Cluster appears alongside image models like FLUX 3 Image also added the same day, signaling a coordinated rollout across coding, reasoning, and image workloads on the gateway.

Vercel has launched Glyph Cluster as a stealth model on AI Gateway, free to call during the preview for teams on Pro and Enterprise plans with purchased AI Gateway credits. The model is positioned as a reasoning system for coding and long-context analysis, supporting multi-step work such as planning, synthesis, quantitative reasoning, comparing large inputs, and reviewing or debugging code. Developers reach it via the model id stealth/glyph-cluster through the AI SDK or OpenAI-compatible Chat Completions and Responses APIs. The listing documents concrete capability limits: text-only input with no image or file support, tool use restricted to user-defined function tools, structured outputs not supported, and ZDR not available, with prompts and responses potentially used for training. Function calling and streaming are supported, enabling agent integration. Free stealth pricing is promotional and subject to change, and no creator or lab is named on the page, so Vercel is treated only as the gateway host.