gpt-oss-120b vs GLM-4.5-Air
Specs, VRAM requirements and download trends — updated 23 October 2026.
openai · A · Open weights
Params
120.4 B
Context
131,072
30d
3.0 M
apache-2.0 · commercial OK
Specification comparison
Differences are highlighted; identical values are muted.
| Specification | gpt-oss-120b | GLM-4.5-Air |
|---|---|---|
| Deployment | Open weights · also via API | Open weights · also via API |
| Parameters | 120.4 B | 110.5 B |
| Architecture | GptOssForCausalLM | Glm4MoeForCausalLM |
| Context length | 131,072 | 131,072 |
| Licence | apache-2.0 | mit |
| Commercial use | Allowed | Allowed |
| Languages | — | 2 |
| Downloads 30d | 2,964,075 | 817,559 |
| Downloads all time | 60.3 M | 5.5 M |
| Quantizations on the Hub | SAFETENSORS | SAFETENSORS |
| Gated | No | No |
| First seen on the Hub | 2025-08-04 | 2025-07-20 |
| API input price / 1M tokens | $0.15 | $0.13 |
| API output price / 1M tokens | $0.60 | $0.85 |
| Est. cost per 1M input + 1M output tokens | $0.75 | $0.98 |
| Cached input / 1M tokens | $0.075 | $0.025 |
| AA Intelligence Index | 11.6 | 11.1 |
| AA Coding Index | 30.4 | — |
| AA Agentic Index | 3.7 | — |
| Max output tokens | 65,536 | 98,304 |
| API providers | 22 | 3 |
| Tool calling | Yes | Yes |
| Reasoning mode | Yes | Yes |
API cost
Estimated cost of 1M input + 1M output tokens via OpenRouter
gpt-oss-120b
$0.75
GLM-4.5-Air
$0.98
gpt-oss-120b is 1.3× cheaper at list price.
Download trend
Daily snapshots, last 88 days (28 Jul – 23 Oct)
5.5 M184 K
gpt-oss-120b
GLM-4.5-Air
VRAM side by side
On RTX 4090 · 24 GB · 8K context unless noted
gpt-oss-120b · fp16 @ 128K ctx
433.0 GB / 24 GB
GLM-4.5-Air · fp16 @ 128K ctx
508.7 GB / 24 GB