Z.ai: GLM 4.5 Air (free)
Analysis Summary
Z.ai: GLM 4.5 Air (free) sits in the Legacy tier on our leaderboard, ranked #545 of 561 published models on overall intelligence. At $0.000 input and $0.000 output per 1M tokens, it is among the most expensive on the market. It offers a standard large context window and supports tool use, function calling, and reasoning.
Editorial notes
GLM 4.5 Air (free) from Z.ai has no benchmark data of its own; tool use and function calling are present but performance cannot be confirmed; -4 penalty applied for provider accessibility.
Assessed May 14, 2026
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
Performance Profile
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 |
Live Performance
Live endpoint metrics — refreshed every 30 minutes.
