gpt-oss-20b vs 120b — which one should you actually run? (2026)

One fits on a gaming GPU; the other needs a data-center card. They're aimed at completely different people. Here's how to pick the right gpt-oss for…

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Lena Fischer · AI & Local Compute Editor

20B vs 120B at a glance

gpt-oss-20b: single 16GB GPU, fast, runs at home. For almost everyone.

20B vs 120B at a glance

gpt-oss-120b: ~60-80GB memory — 80GB GPU, 96GB Mac, or cloud. Not a gaming-card model.

20B vs 120B at a glance

Both are MoE — 120B has ~117B total, only ~5.1B active per token.

20B vs 120B at a glance

120B is smarter — near DeepSeek-R1 reasoning, 3-5× cheaper to deploy than a cluster.

20B vs 120B at a glance

60GB is a floor, not comfort — plan the 120B as an 80GB-class model for a clean run.

20B vs 120B at a glance

The deciding factor is memory — your hardware picks the model, not the other way round.

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gpt-oss-20b vs 120b — which one should you actually run? (2026)

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