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 #517 of 525 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) has no benchmark data of its own; while the free tier is attractive, businesses should rely on the paid GLM 4.5 Air's verified scores before committing to this variant.
Assessed April 23, 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.
