GLM 4.5
VerifiedGLM 4.5 handles long text inputs with a 128K-token context window.
About GLM 4.5
GLM 4.5 is a proprietary LLM built by Z.AI for text modality only. Its 131072-token context window enables processing of lengthy documents and multi-turn dialogues without truncation. The design prioritizes controlled access rather than public weight releases.
Strengths center on sustained coherence across large inputs where open-source alternatives may be limited. Typical usage includes enterprise document analysis, content synthesis, and research workflows that benefit from extended context retention.
Developers integrate it via API for tasks demanding consistent performance on complex text sequences. Z.AI maintains the model to support reliable, production-grade language applications.
Capabilities
How GLM 4.5 compares
GLM 4.5 (striped bar) vs other language models on intelligence, speed and price.
Price
USD per 1M output tokens · Lower is better · GLM 4.5 ranks #50 of 63
Sources: Artificial Analysis (intelligence, speed) · OpenRouter (price).
Best for
Long Document Analysis
Handles reasoning over extended texts such as research papers or contracts thanks to its 131072-token context window and summarization capabilities.
Software Development Tasks
Generates, debugs, and explains code across languages while following detailed technical instructions.
Multilingual Content Workflows
Produces and processes text in multiple languages for translation, localization, or international documentation projects.
Strengths & limitations
Strengths
- +Strong 128k token context handling
- +Competitive bilingual Chinese-English performance
- +Solid general reasoning for an LLM
Limitations
- –Text-only modality
- –No built-in vision or multimodal support
- –Standard LLM risks of hallucination
Cost calculator
Estimate what GLM 4.5 would cost for your usage.
Based on GLM 4.5's $0.60/1M input · $2.20/1M output. Estimate only — actual cost varies by provider and caching.
Quick start
OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. Only the model slug changes between models.
import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://openrouter.ai/api/v1",
apiKey: process.env.OPENROUTER_API_KEY,
});
const completion = await client.chat.completions.create({
model: "z-ai/glm-4.5",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(completion.choices[0].message.content);Model slug: z-ai/glm-4.5
Editor's verdict
GLM 4.5 is Z.AI's proprietary language models with a 131K-token context window.
At $2.20 per 1M output tokens, it is mid-priced for its class.
It is available through Z.AI's API and aggregators like OpenRouter.
Best suited to strong 128k token context handling and competitive bilingual chinese-english performance.
Frequently asked questions
GLM 4.5 supports a context window of 131072 tokens.
User reviews
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