Build apps powered by GPT-OSS 20B on Appaca

GPT-OSS 20B

A 21-billion-parameter open-weight model from OpenAI, designed for efficient reasoning and long-context usage (≈ 128K tokens).

Provider

OpenAI

Model Type

text

Context Window

128,000 tokens

Input (1M)$0.00

Output (1M)$0.00

Capabilities

Open-weight / Apache 2.0 licensed: you can use, modify, and deploy freely (commercially & academically) under permissive terms.
Large model size (≈ 21B parameters) with Mixture-of-Experts (MoE) architecture: only ~3.6B parameters active per token, yielding efficient inference.
Very long context window support: up to ~128 K tokens (or ~131 K tokens per some sources) enabling in-depth reasoning, long documents, or multi-turn context.
Adjustable reasoning effort: you can trade latency vs quality by tuning “reasoning effort” levels.
Efficient hardware requirements (for its class): designed to run on a single 16 GB-class GPU or optimized local deployments for lower latency applications.
Strong for tasks such as reasoning, tool-use, structured output, chain-of-thought debugging: because the model is open and you can inspect its chain of thought.
Flexibility: since weights are available, you can self-host, fine-tune, or deploy offline, giving more control than closed API models.

Describe what you need and Appaca will create a fully working app using GPT-OSS 20B — no API keys, no coding, free to start.