Model specification · OpenAI
gpt-oss-20b
openai/gpt-oss-20b
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...
SpecificationsReported values
- Context window
- 131K
- Maximum output
- 118K
- Architecture
- text->text
- Tokenizer
- GPT
- Knowledge cutoff
- 2024-06-30
- Moderated
- No
- Input modalities
- text
- Output modalities
- text
Full pricingUSD where reported
| Price | Standard |
|---|---|
| Input | $0.030 / M |
| Output | $0.130 / M |
Benchmark indexesReported indexes
- Intelligence
- 9
- Coding
- 20.7
- Agentic
- 1.4
- Design Arena Elo
- 906
Example workload costsStandard pricing only
| Workload | Input / output | Cache share | Estimated cost |
|---|---|---|---|
| Quick check | 10K / 1K × 1 | 0% | $0.00043 |
| Long analysis | 100K / 4K × 1 | 50% | $0.00352 |
| Workday | 20K / 2K × 1,000 | 30% | $0.860 |
More from OpenAIAll OpenAI models
| Model | Context | Input / M | Output / M | Intel. |
|---|---|---|---|---|
| GPT-6 Astra | 1.1M | $10.00 | $50.00 | 52.8 |
| GPT-5.6 Sol | 1.1M | $2.00 | $10.00 | 47.1 |
| GPT-5.6 Terra | 1.1M | $2.00 | $12.00 | 42.3 |
| GPT-5.5 | 1.1M | $5.00 | $30.00 | 38.6 |
| GPT-5.6 Luna | 1.1M | $0.200 | $1.20 | 37.5 |
| GPT-5.4 Mini | 400K | $0.750 | $4.50 | 24.6 |
| GPT-5.4 Nano | 400K | $0.200 | $1.25 | 21.2 |
| GPT-5 Mini | 400K | $0.250 | $2.00 | 17.4 |
| gpt-oss-120b | 131K | $0.150 | $0.600 | 12.3 |
| o3 Mini High | 200K | $1.10 | $4.40 | 11 |