Our agents read user screenshots with the GLM 4.5V API through RouterBase — it parses the UI, understands the chart, and acts on what it sees.
The GLM 4.5V API is Z.ai's flagship vision-language GLM model — a frontier LLM for image understanding, visual reasoning, and multimodal chat, with native tool calling, structured outputs, and a long context window. The GLM 4.5V API is OpenAI-compatible: point any existing SDK at RouterBase and set the model to glm-4-5v. Input at $0.57 / 1M tokens, output at $1.71 / 1M tokens, cached-input reads at $0.1045 / 1M — 5% below the official rate, all through one REST endpoint.
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GLM-4.5V
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GLM 4.5V API: Chat
Use the GLM 4.5V API to run Z.ai's flagship vision-language GLM model — image understanding, visual reasoning, and multimodal chat with native tool calling.
The GLM 4.5V API is Z.ai's flagship vision-language GLM model — a frontier large language model built for image understanding, visual reasoning, and multimodal chat, with native tool calling, structured outputs, and a long context window. Routed through RouterBase, the GLM 4.5V API is fully OpenAI-compatible: point any existing SDK at RouterBase's base URL, set the model to glm-4-5v, and your first GLM 4.5V API call goes through immediately.
Pricing for the GLM 4.5V API is $0.57 / 1M input tokens, $1.71 / 1M output tokens, and $0.1045 / 1M cached-input reads — 5% below the official published rate. One RouterBase key reaches the GLM 4.5V API and 200+ other models — no Z.ai account required.
Six reasons teams ship on the GLM 4.5V API
From native vision to 5%-off pricing — what makes the GLM 4.5V API stand out.
Native vision understanding
The GLM 4.5V API is Z.ai's vision-language GLM model — image understanding, OCR, and visual reasoning for the hardest problems your product can throw at it.
Built for code
The GLM 4.5V API handles multi-file code generation, refactoring, and debugging — a strong choice for coding agents and developer tools.
Native tool calling
The GLM 4.5V API supports function / tool calling out of the box — wire it into agents and let it call your tools in the OpenAI format.
Long context window
The GLM 4.5V API accepts long inputs — fit long documents, multi-file codebases, or full conversation history into a single call.
OpenAI-compatible, one key
The GLM 4.5V API speaks the OpenAI chat-completions format; the same RouterBase key also routes to GPT-5.5, Claude, Gemini, and 200+ other models.
5% below official
The GLM 4.5V API is priced 5% under Z.ai's published rate — $0.57 / 1M input, $1.71 / 1M output. Pay only for the tokens you use.
Quickstart
Get started with the GLM 4.5V API in 3 steps
From sign-up to your first response in under 5 minutes.
Create a RouterBase API key
Sign up and generate an API key — one key reaches the GLM 4.5V API and every other model in the catalog.
Send your first message
Point any OpenAI-compatible SDK at routerbase.com/v1 and set the model to glm-4-5v. The GLM 4.5V API response follows the standard chat-completions schema — streaming and tool use supported.
Inspect usage
Every GLM 4.5V API response includes a detailed token breakdown — input, output, and cached-input tokens — so cost and cache-hit rate are visible on every call.
Pay only for what you use
RouterBase passes through partner-tier pricing. Compared against the model's official published API rate.
What teams build with the GLM 4.5V API
Real production loads running on the RouterBase model catalog across 200+ models.
We added document image understanding to our app by pointing one line at the GLM 4.5V API through RouterBase — no separate OCR service to wire up.
Tool calling on the GLM 4.5V API dropped straight into our existing agent framework — it reads a scanned form, then calls our tools, all in one OpenAI-format loop.
RouterBase puts 200+ models behind one key. We A/B the GLM 4.5V API against other vision models on our OCR and chart-reading evals without touching our integration.
Our RAG now ingests scanned PDFs and tables — the GLM 4.5V API reads the page images directly, so retrieval finally covers our visual documents.
We pointed our OpenAI SDK at RouterBase with one base-URL swap and the GLM 4.5V API just worked — same multimodal messages, images and text in one call.
Frequently Asked Questions
Common questions about the GLM 4.5V API.
The GLM 4.5V API is RouterBase's pass-through to Z.ai's GLM-4.5V — Z.ai's flagship vision-language GLM model for reasoning, coding, and agentic work, served via an OpenAI-compatible REST interface with native tool calling and structured outputs.