Vercel added Z.ai's GLM-5.3-Flash to AI Gateway with text and image input, allowing applications to send visual material alongside instructions through the same model endpoint. The announcement identifies the model as zai/glm-5.3-flash and supports multiple images supplied by URL or encoded data.
tool useA model's ability to call external functions — run code, search the web, edit files — instead of only generating text.Full definition → and structured outputForcing a model's response to match a schema, so downstream code can parse it instead of guessing at prose.Full definition → let the model participate in workflows that invoke application tools or require a defined response format. The gateway supplies the access and routing layer; developers can select this model within that layer without building a separate provider integration.
Terms in this piece · Glossary
tool use — A model's ability to call external functions — run code, search the web, edit files — instead of only generating text.
structured output — Forcing a model's response to match a schema, so downstream code can parse it instead of guessing at prose.
context window — The maximum amount of text a model can consider at once — its working memory for the current conversation or task.
streaming — Sending a model's response token by token as it is generated, so the reader sees text immediately instead of waiting for the whole answer.
