AI Recommendation
Should you use Z.ai: GLM 5.1?
Z.ai: GLM 5.1 is listed for chat workloads and supports a 203K context window.
Use the comparison and availability sections before choosing this listing, because it is not currently marked as free.
Z.ai: GLM 5.1 pricing and alternatives
Paid / limitedZ.AI GLM 5.1 is Zhipu AI's latest model, free on NVIDIA NIM with up to 40 RPM and no daily token cap.
Paid / limitedOpenAI compatibleReasoningTool callingJSON modeTextReasoning
Context window 203K
Max output 128K
API format OpenAI-style
Status Online
Best for
- Chat
Strengths & Weaknesses
Strengths
- Long context window
- Reasoning mode listed
- Tool calling support
- Structured JSON output
Watch outs
- No current free listing on this provider
- Free-tier rate limits apply
- Vision support is not listed
Benchmark Overview
Benchmark signals for Z.ai: GLM 5.1
Intelligence General reasoning and instruction following
40.2/100 Coding Programming and code generation
55.8/100 Agentic Tool use and multi-step tasks
29.9/100 Speed Observed generation speed
65 tok/s Context Maximum listed context window
203K Pricing
Z.ai: GLM 5.1 pricing per 1M tokens
Input $1.4 per 1M tokens
Output $4.4 per 1M tokens
Free access Not listed OpenRouter
Rate limit 200 req/day (free tier) provider policy
Availability
Z.ai: GLM 5.1 availability by provider
We only found this Z.ai: GLM 5.1 listing on OpenRouter in the current catalog. Use the related models section for nearby alternatives.
| Provider | Model listing | Access | Context | API | Limits |
|---|---|---|---|---|---|
| | Z.ai: GLM 5.1 | Paid | 203K | OpenAI-style | 200 req/day (free tier) |
Compare
Z.ai: GLM 5.1 alternatives to consider
| Model | Provider | Context | Access |
|---|---|---|---|
| Poolside: Laguna XS 2.1 (free) | OpenRouter | 262K | Free tier |
| Cohere: North Mini Code (free) | OpenRouter | 256K | Free tier |
| NVIDIA: Nemotron 3.5 Content Safety (free) | OpenRouter | 128K | Free tier |
| NVIDIA: Nemotron 3 Ultra (free) | OpenRouter | 1.0M | Free tier |
| NVIDIA: Nemotron 3 Nano Omni (free) | OpenRouter | 256K | Free tier |
Typical Use Cases
Z.ai: GLM 5.1 use cases
Chat
Z.ai: GLM 5.1 is tagged for chat in this catalog and works with OpenAI-compatible client libraries.
FAQ
Z.ai: GLM 5.1 free API FAQ
Is Z.ai: GLM 5.1 free to use?
Z.ai: GLM 5.1 is not currently marked as free on OpenRouter.
What is the Z.ai: GLM 5.1 model ID?
The model ID shown in this catalog is z-ai/glm-5.1.
What are the Z.ai: GLM 5.1 free tier rate limits on OpenRouter?
The listed free tier limit is 200 req/day (free tier). Limits can change per account tier, so confirm against the provider dashboard.
What context window does Z.ai: GLM 5.1 support?
The listed context window is 203K tokens with up to 128K output tokens.
More about Z.ai: GLM 5.1
Z.AI GLM 5.1 is Zhipu AI's latest model, free on NVIDIA NIM with up to 40 RPM and no daily token cap. GLM 5.1 brings Zhipu AI's newest advances in bilingual (Chinese-English) performance and general reasoning. NVIDIA's OpenAI-compatible API makes it accessible from standard toolchains. Requires free NVIDIA Developer Program membership and phone verification.
For API keys, setup steps, and provider-level limits, see the OpenRouter provider page.