AI Recommendation
Should you use GLM-4.5-Flash?
GLM-4.5-Flash is listed for chat workloads and supports a 128K context window.
Use it when Z AI (Zhipu AI)'s free tier is enough for evaluation, demos, or light production traffic.
GLM-4.5-Flash Free API on Z AI (Zhipu AI)
Free API VerifiedHybrid-reasoning GLM release that made the 4.5 line broadly useful
Free APIOpenAI compatibleReasoningTool callingJSON modeTextReasoning
API Details
Copy-ready connection details
Base URL
https://open.bigmodel.cn/api/paas/v4 Model ID
glm-4.5 API format OpenAI Chat Completions
Technical Details
GLM-4.5-Flash specifications
Context window 128K
Max output 96K
Status Online
Family glm
Knowledge cutoff 2025-04
Released Jul 28, 2025
Last updated Aug 6, 2026
Free listing since Jul 28, 2025
Input text
Output text
Capabilities reasoning, tool calling, structured output, temperature control
Open weights Yes
Weights Hugging Face
External benchmark references
| Benchmark | Score | Metric | Date |
|---|---|---|---|
| Artificial Analysis Coding Index | 26.3 | index | 2026-03-11 |
| SciCode | 34.8 | percent correct | 2026-03-11 |
| Terminal-Bench Hard | 22 | success rate | 2026-03-11 |
Best for
- Chat
Strengths & Weaknesses
Strengths
- Long context window
- Reasoning mode listed
- Tool calling support
- Structured JSON output
Watch outs
- Free-tier rate limits apply
- Vision support is not listed
Benchmark Overview
Benchmark signals for GLM-4.5-Flash
Intelligence General reasoning and instruction following
26.4/100 Coding Programming and code generation
26.3/100 Agentic Tool use and multi-step tasks
16.2/100 Context Maximum listed context window
128K Pricing
GLM-4.5-Flash pricing per 1M tokens
Input $0 per 1M tokens
Output $0 per 1M tokens
Free access Available Z AI (Zhipu AI)
Rate limit 1 concurrent request provider policy
Availability
GLM-4.5-Flash availability by provider
We only found this glm-4-5 listing on Z AI (Zhipu AI) in the current catalog. Use the related models section for nearby alternatives.
| Provider | Model listing | Access | Context | API | Limits |
|---|---|---|---|---|---|
| | GLM-4.5-Flash | Free tier | 128K | OpenAI-style | 1 concurrent request |
Compare
GLM-4.5-Flash alternatives to consider
| Model | Provider | Context | Access |
|---|---|---|---|
| GLM-4.7-Flash | Z AI (Zhipu AI) | 200K | Free tier |
| GLM-4.6V-Flash | Z AI (Zhipu AI) | 128K | Free tier |
| GLM-4.5-Air | Z AI (Zhipu AI) | 131K | Free tier |
Typical Use Cases
GLM-4.5-Flash use cases
Chat
GLM-4.5-Flash is tagged for chat in this catalog and works with OpenAI-compatible client libraries.
FAQ
GLM-4.5-Flash free API FAQ
Is GLM-4.5-Flash free to use?
GLM-4.5-Flash is listed with free API access on Z AI (Zhipu AI), subject to the provider's quota and account policy.
What is the GLM-4.5-Flash model ID?
The model ID shown in this catalog is glm-4.5.
What are the GLM-4.5-Flash free tier rate limits on Z AI (Zhipu AI)?
The listed free tier limit is 1 concurrent request. Limits can change per account tier, so confirm against the provider dashboard.
What context window does GLM-4.5-Flash support?
The listed context window is 128K tokens with up to 96K output tokens.
More about GLM-4.5-Flash
Z AI's GLM-4.5-Flash offers a free LLM for text tasks, generating up to 8,000 tokens of context from 128,000 tokens input, with no credit card needed and OpenAI compatibility, ideal for chat applications with a rate limit of one concurrent request.
For API keys, setup steps, and provider-level limits, see the Z AI (Zhipu AI) provider page.