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Get started freeGPT-OSS 120B vs GPT-OSS 20B
Compare GPT-OSS 120B and GPT-OSS 20B. Build AI products powered by either model on Appaca.
Model Comparison
| Feature | GPT-OSS 120B | GPT-OSS 20B |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Model Type | text | text |
| Context Window | 131,072 tokens | 128,000 tokens |
| Input Cost | $0.00/ 1M tokens | $0.00/ 1M tokens |
| Output Cost | $0.00/ 1M tokens | $0.00/ 1M tokens |
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Build your first app freeStrengths & Best Use Cases
GPT-OSS 120B
OpenAI1. Most powerful open-weight model
- 117B parameters (5.1B active) while fitting on a single H100 GPU.
- High reasoning quality compared to other open models.
2. Apache 2.0 license
- Fully permissive, no copyleft or patent restrictions.
- Safe for commercial products, research, and redistribution.
3. Configurable reasoning effort
- Supports adjustable reasoning: low, medium, high.
- Lets developers balance latency vs. depth.
4. Full chain-of-thought access
- Unlike closed commercial models, this exposes complete reasoning traces.
- Useful for debugging, auditing, safety research, and transparency.
5. Fine-tunable
- Fully supports parameter fine-tuning.
- Can be adapted to domain-specific workflows and proprietary datasets.
6. Agentic capabilities
- Built-in function calling.
- Native support for web browsing, Python execution, and structured outputs.
- Ideal for open-source agents, full-stack automation, and developer tooling.
7. Tooling ecosystem support
- Compatible with Chat Completions, Responses API, Assistants, Realtime, Batch, and Fine-tuning endpoints.
- Supports Image Generation, Code Interpreter (via Python runtime), and more.
8. Open-source availability
- Downloadable on HuggingFace for local or on-prem deployment.
- Supports full offline, private, or self-hosted usage.
9. Streaming + function calling support
- Real-time interactions.
- Strong for interactive agents, coding assistants, and UI-driven workflows.
GPT-OSS 20B
OpenAI- 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.
Prompts to Get Started
Use these prompts to power AI products you build on Appaca. Each works great with the models above.
Best for GPT-OSS 120B
textLicence Agreement Key Terms
Summarise the key commercial and legal terms in a licence agreement.
Business Case Document
Write a business case to get approval for a project or investment.
Board Presentation Outline
Structure a board meeting presentation covering performance and strategy.
Best for GPT-OSS 20B
textCollaboration Outreach Request
Draft collaboration outreach messages for partnerships, co-marketing, podcasts, affiliates, and integrations-with clear value exchange and next steps.
LinkedIn Company Page Post
Write a professional LinkedIn post for a company page update or announcement.
Action Item Extraction
Extract and organise action items from meeting notes or a document.