gpt-oss-20b vs Nex-N2.5-mini
Specs, VRAM requirements and download trends — updated 25 October 2026.
openai · A · Open weights
Params
21.5 B
Context
131,072
30d
5.8 M
apache-2.0 · commercial OK
Specification comparison
Differences are highlighted; identical values are muted.
| Specification | gpt-oss-20b | Nex-N2.5-mini |
|---|---|---|
| Deployment | Open weights · also via API | Open weights · also via API |
| Parameters | 21.5 B | 35.1 B |
| Architecture | GptOssForCausalLM | Qwen3_5MoeForConditionalGeneration |
| Context length | 131,072 | 262,144 |
| Licence | apache-2.0 | apache-2.0 |
| Commercial use | Allowed | Allowed |
| Languages | — | — |
| Downloads 30d | 5,764,154 | 3,253 |
| Downloads all time | 105.3 M | 12 K |
| Quantizations on the Hub | SAFETENSORS | SAFETENSORS |
| Gated | No | No |
| First seen on the Hub | 2025-08-04 | 2026-09-08 |
| API input price / 1M tokens | $0.018 | $0.025 |
| API output price / 1M tokens | $0.09 | $0.10 |
| Est. cost per 1M input + 1M output tokens | $0.11 | $0.13 |
| Cached input / 1M tokens | $0.009 | $0.0025 |
| AA Intelligence Index | 10 | — |
| AA Coding Index | — | — |
| AA Agentic Index | — | — |
| Max output tokens | 32,768 | 235,929 |
| API providers | 10 | 1 |
| Tool calling | Yes | No |
| Reasoning mode | Yes | Yes |
API cost
Estimated cost of 1M input + 1M output tokens via OpenRouter
gpt-oss-20b
$0.11
Nex-N2.5-mini
$0.13
gpt-oss-20b is 1.2× cheaper at list price.
Download trend
Daily snapshots, last 90 days (28 Jul – 25 Oct)
8.6 M3 K
gpt-oss-20b
Nex-N2.5-mini
VRAM side by side
On RTX 4090 · 24 GB · 8K context unless noted
gpt-oss-20b · fp16 @ 128K ctx
82.4 GB / 24 GB
Nex-N2.5-mini · fp16
83.0 GB / 24 GB