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...
gpt-oss-20b specs and pricing
- Provider: OpenAI
- Released: August 5, 2025
- Context window: 131K tokens
- Max output: 33K tokens
- Input: text
- Output: text
- Price: $0.018 input / $0.09 output per 1M tokens
- Reasoning: yes
- Tool calling: yes
FAQ
- How much does gpt-oss-20b cost? gpt-oss-20b costs $0.018 per million input tokens and $0.09 per million output tokens through OpenRouter. In todo.is a typical agent step costs about 0.06 credits ($1 = 100 credits).
- What is the context window of gpt-oss-20b? gpt-oss-20b can read up to 131K tokens at once and write up to 33K tokens in one reply.
- Can I use gpt-oss-20b without coding? Yes. In todo.is you pick gpt-oss-20b as your agent's model and write to-dos in plain words, on the web, the Android app, WhatsApp or Telegram. No API key needed: credits are included, or you can bring your own key.
JavaScript is required to use the todo.is app.