OpenAI · 2025-08-05
gpt-oss-20b pricing
gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license.
Prices from OpenRouter’s models API, updated October 29, 2026
What gpt-oss-20b costs a month
| Workload | Standard | Batch API |
|---|---|---|
| Support chatbot: 1,000 chats a day, 1,500 tokens in, 400 out | $1.89 | $2.42 |
| Daily summaries: 10,000 a day, 3,000 tokens in, 300 out | $24.30 | $31.68 |
| Coding agent: 400 calls a day, 60,000 tokens in (80% cached), 2,000 out | $9.94 | $11.33 |
30 days. Cached input billed at the cache-read price. Use your own numbers.
Other GPT models
| Model | Input /1M | Output /1M | Cache read /1M | Context | Chatbot, per month* |
|---|---|---|---|---|---|
| GPT-6.1 Terra | $1 | $5 | $0.05 | 1.05M | $105 |
| GPT-6.1 Terra Pro | $1 | $5 | $0.05 | 1.05M | $105 |
| GPT-6.1 Sol | $2 | $10 | $0.10 | 1.05M | $210 |
| GPT-6.1 Sol Pro | $2 | $10 | $0.10 | 1.05M | $210 |
| GPT-6 Luna | $0.10 | $0.50 | $0.01 | 1.05M | $10.50 |
| GPT-6 Luna Pro | $0.10 | $0.50 | $0.01 | 1.05M | $10.50 |
* Support chatbot: 1,000 chats a day, 1,500 tokens in, 400 out, 30 days, no caching. Prices in US dollars per 1M tokens.
Related
gpt-oss-20b: questions
How much does gpt-oss-20b cost?
$0.018 per 1M input tokens and $0.09 per 1M output tokens, with cached input at $0.009, or $0.024 / $0.112 through the batch API. A 1,000-token prompt with a 500-token answer costs about $0.0001.
What is gpt-oss-20b’s context window?
131,072 tokens, with up to 32,768 output tokens per response.
Know what each model really costs you.
Connect OpenRouter and Glow shows spend by model, key and product, and flags the swap that saves the most at the same quality.
- Read-only keys
- Never shown again
- 2FA + Face ID
- 7-day trial