Model comparison
GLM 4.5 vs GLM 4.5 Air
Price history, scores and specs for both models, line by line. Every value shows where it came from and when we last confirmed it.
Z Ai
GLM 4.5
GLM-4.5 is our latest flagship foundation model, purpose-built for agent-based applications.
Z Ai
GLM 4.5 Air
GLM-4.5-Air is the lightweight variant of our latest flagship model family, also purpose-built for agent-centric applications.
Quick take
Where each one leads
- GLM 4.5 Air costs less to send text to: $0.200 per million tokens, against $0.600 per million tokens for GLM 4.5.
- GLM 4.5 Air costs less per word it writes: $1.10 per million tokens, against $2.20 per million tokens for GLM 4.5.
- GLM 4.5 scores higher on the Artificial Analysis Intelligence Index: 12.8 to 11.1.
- More people run GLM 4.5 Air through OpenRouter than GLM 4.5 right now.
Each line comes from a checked value in the tables below. Pick on your workload: price and usage matter for high volume, context and scores for long documents and agent loops.
Price history
Prices side by side, day by day
- GLM 4.5
- GLM 4.5 Air
- GLM 4.5
- GLM 4.5 Air
Prices are the listed OpenRouter base rates in US dollars. A day we could not confirm is left out of the line, never filled in.
Price
What each one costs now
| Measure | GLM 4.5 | GLM 4.5 Air |
|---|---|---|
| Input price | $0.600 per million tokens | $0.200 per million tokens Leads |
| Output price | $2.20 per million tokens | $1.10 per million tokens Leads |
Scores
Benchmarks, with source and date
| Measure | GLM 4.5 | GLM 4.5 Air |
|---|---|---|
| Artificial Analysis Intelligence Index | 12.8 Leads | 11.1 |
| LMArena text rating (Elo) | 1,430 Leads | 1,384 |
| Design Arena rating (Elo) | 1,166 | 1,184 Leads |
Specs
Context, modalities and tool use
| Measure | GLM 4.5 | GLM 4.5 Air |
|---|---|---|
| Context window | 131,072 tokens | 131,072 tokens |
| Reads | Text | Text |
| Writes | Text | Text |
| Tool calling | Yes | Yes |
| Reasoning mode | Yes | Yes |
| Open weights | Yes | Yes |
| Listed since | 25 July 2025 | 25 July 2025 |
Usage
How much each one is used
| Measure | GLM 4.5 | GLM 4.5 Air |
|---|---|---|
| Tokens served on OpenRouter in a day | 217.7M (for 10 Nov 2026) | 430.8M Leads (for 10 Nov 2026) |
| Requests on OpenRouter in a day | 35.4K (for 10 Nov 2026) | 127.4K Leads (for 10 Nov 2026) |
| Tool calls on OpenRouter in a day | 1.2K (for 10 Nov 2026) | 5.8K Leads (for 10 Nov 2026) |
| Token usage, last 7 days | Down 62% on the week before (for 10 Nov 2026) | Down 27% on the week before Leads (for 10 Nov 2026) |
- GLM 4.5
- GLM 4.5 Air
How this works
One link, either order
This link stays the same whichever order you name the two models in, so you can share it as it is. A line appears only when at least one model has a value we confirmed from a source; values we have not confirmed are left out, never guessed. To add a third record of any type, use the open comparison. Read how we check facts.