GLM-4.5-Air vs Mercury 2
API pricing, benchmark indices and specs — updated 19 October 2026.
inception · B · API-only
Input / 1M
$0.25
Output / 1M
$0.75
AA index
10.8
proprietary · 128K context
Specification comparison
Differences are highlighted; identical values are muted.
| Specification | GLM-4.5-Air | Mercury 2 |
|---|---|---|
| Deployment | Open weights · also via API | API-only (closed weights) |
| Parameters | 110.5 B | n/a — API-only |
| Architecture | Glm4MoeForCausalLM | n/a — API-only |
| Context length | 131,072 | 128,000 |
| Licence | mit | Proprietary |
| Commercial use | Allowed | Per API terms |
| Languages | 2 | n/a — API-only |
| Downloads 30d | 850,129 | n/a — API-only |
| Downloads all time | 5.5 M | n/a — API-only |
| Quantizations on the Hub | SAFETENSORS | n/a — API-only |
| Gated | No | n/a — API-only |
| First seen on the Hub | 2025-07-20 | n/a — API-only |
| API input price / 1M tokens | $0.13 | $0.25 |
| API output price / 1M tokens | $0.85 | $0.75 |
| Est. cost per 1M input + 1M output tokens | $0.98 | $1.00 |
| Cached input / 1M tokens | $0.025 | $0.025 |
| AA Intelligence Index | 11.1 | 10.8 |
| AA Coding Index | — | 31.1 |
| AA Agentic Index | — | 1.6 |
| Max output tokens | 98,304 | 50,000 |
| API providers | 3 | 1 |
| Tool calling | Yes | Yes |
| Reasoning mode | Yes | Yes |
API cost
Estimated cost of 1M input + 1M output tokens via OpenRouter
GLM-4.5-Air
$0.98
Mercury 2
$1.00
GLM-4.5-Air is 1.0× cheaper at list price.
VRAM side by side
On RTX 4090 · 24 GB · 8K context unless noted
GLM-4.5-Air · fp16 @ 128K ctx
508.7 GB / 24 GB