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GPT OSS 20B

GPT OSS 20B is OpenAI's smaller open-weight model with roughly 21 billion total parameters and 3.6 billion active per token, designed for low-latency, agentic, and on-device workloads.

ReasoningTool Use
index.ts
import { streamText } from 'ai'
const result = streamText({
model: 'openai/gpt-oss-20b',
prompt: 'Why is the sky blue?'
})