gpt-oss-20b vs NVIDIA-Nemotron-3.5-Lightning-30B-A3B-BF16
Specs, VRAM requirements and download trends — updated 10 November 2026.
openai · A · Open weights
Params
21.5 B
Context
131,072
30d
5.8 M
apache-2.0 · commercial OK
nvidia · B · Open weights
Params
31.6 B
Context
262,144
30d
1.1 M
Specification comparison
Differences are highlighted; identical values are muted.
| Specification | gpt-oss-20b | NVIDIA-Nemotron-3.5-Lightning-30B-A3B-BF16 |
|---|---|---|
| Deployment | Open weights · also via API | Open weights · also via API |
| Parameters | 21.5 B | 31.6 B |
| Architecture | GptOssForCausalLM | NemotronHForCausalLM |
| Context length | 131,072 | 262,144 |
| Licence | apache-2.0 | other |
| Commercial use | Allowed | Unknown |
| Languages | — | 6 |
| Downloads 30d | 5,830,063 | 1,082,506 |
| Downloads all time | 108.5 M | 2.3 M |
| Quantizations on the Hub | SAFETENSORS | SAFETENSORS |
| Gated | No | No |
| First seen on the Hub | 2025-08-04 | 2026-08-01 |
| API input price / 1M tokens | $0.03 | $0.07 |
| API output price / 1M tokens | $0.13 | $0.20 |
| Est. cost per 1M input + 1M output tokens | $0.16 | $0.27 |
| Cached input / 1M tokens | $0.03 | $0.04 |
| AA Intelligence Index | — | 5.5 |
| AA Coding Index | 20.7 | 26.8 |
| AA Agentic Index | 1.2 | 3.5 |
| Max output tokens | 117,964 | 235,929 |
| API providers | 10 | 5 |
| Tool calling | Yes | Yes |
| Reasoning mode | Yes | Yes |
API cost
Estimated cost of 1M input + 1M output tokens via OpenRouter
gpt-oss-20b
$0.16
NVIDIA-Nemotron-3.5-Lightning-30B-A3B-BF16
$0.27
gpt-oss-20b is 1.7× cheaper at list price.
Download trend
Daily snapshots, last 90 days (13 Aug – 10 Nov)
8.1 M364 K
gpt-oss-20b
NVIDIA-Nemotron-3.5-Lightning-30B-A3B-BF16
VRAM side by side
On RTX 4090 · 24 GB · 8K context unless noted
gpt-oss-20b · fp16 @ 128K ctx
82.4 GB / 24 GB
NVIDIA-Nemotron-3.5-Lightning-30B-A3B-BF16 · fp16 @ 256K ctx
224.5 GB / 24 GB