openai
OpenAI: gpt-oss-20b API Pricing
OpenAI: gpt-oss-20b costs $0.030 per 1M input tokens and $0.130 per 1M output tokens (cache reads: $0.030). Context window: 131K. Prices verified 2026-08-23 Β· source
Input / 1M tokens
$0.030
Output / 1M tokens
$0.130
Context window
131K
Max output
131K
What would OpenAI: gpt-oss-20b cost you per month?
| Workload | Requests/mo | Avg tokens (in/out) | Est. monthly cost |
|---|---|---|---|
| Light chatbot | 10,000 | 800 / 400 | $0.76 |
| Coding agent | 5,000 | 8,000 / 2,000 | $2.50 |
| RAG pipeline | 30,000 | 4,000 / 500 | $5.55 |
| Doc summarizer | 2,000 | 20,000 / 1,000 | $1.46 |
Estimates use list prices without prompt caching. Caching can cut input cost by up to 90% on repeated context.
About 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...
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