Z.ai: GLM 4.5 Air (free)
Analysis Summary
Z.ai's GLM 4.5 Air (free) is a no-cost variant with tool use and function calling across a 131K context window. Without any benchmark data, its actual reasoning, coding, or instruction-following capability cannot be assessed against the broader model landscape.
For businesses, the free tier is appropriate only for low-stakes experimentation or internal prototyping. Any production workflow requiring reliable output quality, strong reasoning, or consistent instruction following should use a benchmarked alternative.
Until benchmark data is available, this model cannot be recommended for client-facing or business-critical applications.
Assessed June 6, 2026
Editorial notes
GLM 4.5 Air (free) from Z.ai has tool use and function calling but no benchmark data, capping its assessed capability; the free tier suits only exploratory or low-stakes use.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
Performance Profile
How Z.ai: GLM 4.5 Air (free) compares
Its 131K-token context window is larger than 59% of the models we list. Z.ai: GLM 4.5 Air (free) is currently free to use via OpenRouter.
About Z.ai: GLM 4.5 Air (free)
GLM-4.5-Air is the lightweight variant of our latest flagship model family, also purpose-built for agent-centric applications. Like GLM-4.5, it adopts the Mixture-of-Experts (MoE) architecture but with a more compact parameter..
Capabilities
How does Z.ai: GLM 4.5 Air (free) stack up?
Compare side-by-side with other legacy models.
Model Information
| OpenRouter ID |
z-ai/glm-4.5-air:free
|
| Provider | z-ai |
| Release Date | July 25, 2025 |
| Context Length | 131,072 tokens |
| Max Completion | 96,000 tokens |
| Status | Active |
Leaderboard Categories
External Resources
Frequently asked questions about Z.ai: GLM 4.5 Air (free)
How much does Z.ai: GLM 4.5 Air (free) cost?
Z.ai: GLM 4.5 Air (free) is currently available for free via OpenRouter.
What is the context window of Z.ai: GLM 4.5 Air (free)?
Z.ai: GLM 4.5 Air (free) has a context window of 131,072 tokens (131K).
What can Z.ai: GLM 4.5 Air (free) do?
Z.ai: GLM 4.5 Air (free) supports tool use and function calling.
Who created Z.ai: GLM 4.5 Air (free)?
Z.ai: GLM 4.5 Air (free) is developed by Z.ai and was released on July 25, 2025.
