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gpt-oss-20b (free)
openai·openai/gpt-oss-20b-free·GA·Open weights·gpt-oss series
Open-weight GPT model for self-hosted reasoning and instruction-following workloads
At a glance
Reference price$0 / $0 per 1M
Cache read — · OpenRouter
Lowest paidNo paid channels
1 more $0 channels
Context131,072
Output limit32,768
Capabilities
✓ Reasoning✓ Tool use✓ Structured output✓ TemperatureAttachments
Modalities
Text
Knowledge cutoff—
Released / updated2025-08-05 / 2025-08-05
Quality & performance
Artificial Analysis doesn't cover this model (267 of 2059 have data). Quality data comes from independent evals covering widely used models.
Available at 1 providers0 with public prices · 1 free
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| OpenRouter openai/gpt-oss-20b:free | Gateway | Free | — | — | 131,072 | 32,768 |
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.
Your usage cost
This model is $0 across all listed channels (OpenRouter).
Benchmark
No upstream benchmark data for this model. For quality, see the Artificial Analysis intelligence score above.
Reasoning control
effort = loweffort = mediumeffort = high
Related models
Safety GPT OSS 20Bsame series$0.075 / $0.30OpenAI GPT OSS 120Bsame series$2.92 / $2.92OpenAI GPT-oss-20bsame series$0.05 / $0.45
Price historyone sample accumulated per data sync
Input listOutput listMin blended