Model comparison · text
gpt-oss-120b vs gpt-oss-20b
Symmetrical, primary-source facts with unknown values left visible. No winner is assigned without comparable measurements.
FieldAt a glance
OpenAI · activegpt-oss-120bVerified Aug 28, 2026
OpenAI · activegpt-oss-20bVerified Aug 28, 2026
Technical differences
Side-by-side facts
| Field | gpt-oss-120b | gpt-oss-20b |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Family | Gpt Oss 120b | Gpt Oss |
| Model | gpt-oss-120b | gpt-oss-20b |
| Version | gpt-oss-120b | gpt-oss-20b |
| Lifecycle | active | active |
| Input modalities | Text | Text |
| Output modalities | Text | Text |
| Context window | 131072 | 131072 |
| Total parameters | 116829156672 | 20914757184 |
| Active parameters | 5100000000 | 3600000000 |
| License | apache-2.0 | apache-2.0 |
| Open weights | Yes | Yes |
| API available | Yes | Yes |
| Self-hostable | Yes | Yes |
| Capabilities | chat, generation, reasoning, tools | chat, generation, reasoning, tools |
15 comparable fields · 5 material differences · Pair passes the primary-source comparison gate
Primary benchmark evidence
Comparable performance
No protocol-matched benchmark yet.Results appear here only when both models share the same benchmark version, metric, evaluation protocol, and evidence class.
gpt-oss-120b capabilities
Input price$0.037
Output price$0.17
Serving providers5
Canonical IDopenai/gpt-oss-120b
gpt-oss-20b capabilities
Input price$0.030
Output price$0.13
Serving providers4
Canonical IDopenai/gpt-oss-20b
Internal comparison graph
Related comparisons
Primary evidence