gpt-oss-20b
OpenAI · Mid
gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It uses a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per forward pass, optimized for...
Input / 1M
$0.029
Output / 1M
$0.14
Cached input / 1M
—
Context window
131K
Where it sits
8th-cheapest mid model
by blended $/Mtok among 262 listed mid models
90% below the mid median
blended $/Mtok across 262 mid models
Output costs 4.8× input
$0.029 in / $0.14 out per 1M
Held flat since launch (Jun 2026)
no blended price change recorded
Computed live from current prices and this model's history — not hand-written, so it stays accurate as prices move.
Price history
Only one price on record so far — the history chart appears once a price changes.
Snapshots
| Effective | Input | Output | Cached in | Note | Source |
|---|---|---|---|---|---|
| 11 Jun 2026 | $0.029 | $0.14 | — | Imported from OpenRouter | openrouter.ai |