GPT OSS 20B
AffordableRun locallyOpenAI's compact open-weights model for efficient inference.
Small 20B model designed for deployability and cost-effectiveness on common tasks.
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GPT OSS 20B is somewhat expensive at $0.03/M tokens input and $0.13/M tokens output. Cached input reads are priced at $0.03/M tokens, making repeated context cheaper. The model supports extended reasoning, a 131K context window.
Benchmarks
Category Rankings
Specifications
Performance
Providers
Run locally
Run GPT OSS 20B on your own computer with the Local AI Engine for free, with no rate limits and no third-party AI provider involved. idapt installs it and routes chat to your hardware automatically.
ollama pull gpt-oss:20b
Misc
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Mistral Small 4vs GPT OSS 20BFrequently Asked Questions about GPT OSS 20B▼
When was GPT OSS 20B released?
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GPT OSS 20B was released on August 5, 2025.
Who created GPT OSS 20B?
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GPT OSS 20B was created by OpenAI.
How much does GPT OSS 20B cost?
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GPT OSS 20B costs $0.03/M input tokens and $0.13/M output tokens.
What is GPT OSS 20B API pricing?
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The GPT OSS 20B API is priced at $0.03 per million input tokens and $0.13 per million output tokens. You can access GPT OSS 20B through idapt.app alongside 200+ other AI models in one workspace.
Is GPT OSS 20B a reasoning model?
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Yes, GPT OSS 20B is a reasoning model. It can think step-by-step through complex problems before providing an answer, often yielding better results on difficult tasks like math, coding, and multi-step logic.
Does GPT OSS 20B support image or vision input?
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No, GPT OSS 20B does not currently support image or vision input. It is a text-only model.
Does GPT OSS 20B support audio?
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No, GPT OSS 20B does not support audio input.
What is the context window of GPT OSS 20B?
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GPT OSS 20B has a context window of 131K tokens, meaning it can process approximately 98,304 words of context at once.
Is GPT OSS 20B open source?
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GPT OSS 20B is a proprietary model developed by OpenAI. The model weights and training data are not publicly available.
Where can I use GPT OSS 20B?
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You can chat with GPT OSS 20B on idapt.app — no separate API key required. idapt is an AI workspace with 200+ models, agents, computers, and tasks. You can also access GPT OSS 20B through OpenAI's own API or platform.