AI Recommendation
Should you use GPT OSS 20B?
GPT OSS 20B is listed for chat workloads and supports a 131K context window.
Use it when NVIDIA NIM's free tier is enough for evaluation, demos, or light production traffic.
GPT OSS 20B Free API on NVIDIA NIM
Free API Verified Catalog metadata matched Reasoning models.dev metadata
Open GPT reasoning model for self-hosted agents and controllable deployments
Free APIOpenAI compatibleReasoningTool callingJSON modeReasoning
API Details
Copy-ready connection details
Base URL
https://integrate.api.nvidia.com/v1 Model ID
openai/gpt-oss-20b API format OpenAI Chat Completions
Technical Details
GPT OSS 20B specifications
Context window 131K
Max output 33K
Status Online
Family gpt-oss
Released Aug 5, 2025
Last updated Aug 5, 2025
Free listing since Jul 10, 2026
Input text
Output text
Capabilities reasoning, tool calling, structured output, temperature control
Open weights Yes
Weights Hugging Face
Best for
- Chat
Strengths & Weaknesses
Strengths
- Long context window
- Reasoning mode listed
- Tool calling support
- Structured JSON output
Watch outs
- Vision support is not listed
Pricing
GPT OSS 20B pricing per 1M tokens
Input $0 per 1M tokens
Output $0 per 1M tokens
Free access Available NVIDIA NIM
Availability
GPT OSS 20B availability by provider
We only found this GPT OSS 20B listing on NVIDIA NIM in the current catalog. Use the related models section for nearby alternatives.
| Provider | Model listing | Access | Context | API | Limits |
|---|---|---|---|---|---|
| | GPT OSS 20B | Free tier | 131K | Native | Varies |
Compare
GPT OSS 20B alternatives to consider
| Model | Provider | Context | Access |
|---|---|---|---|
| 01-ai/yi-large | NVIDIA NIM | 131K | Free tier |
| adept/fuyu-8b | NVIDIA NIM | 131K | Free tier |
| ai21labs/jamba-1.5-large-instruct | NVIDIA NIM | 131K | Free tier |
| aisingapore/sea-lion-7b-instruct | NVIDIA NIM | 131K | Free tier |
| baai/bge-m3 | NVIDIA NIM | 131K | Free tier |
Typical Use Cases
GPT OSS 20B use cases
Chat
GPT OSS 20B is tagged for chat in this catalog and works with OpenAI-compatible client libraries.
FAQ
GPT OSS 20B free API FAQ
Is GPT OSS 20B free to use?
GPT OSS 20B is listed with free API access on NVIDIA NIM, subject to the provider's quota and account policy.
What is the GPT OSS 20B model ID?
The model ID shown in this catalog is openai/gpt-oss-20b.
What context window does GPT OSS 20B support?
The listed context window is 131K tokens with up to 33K output tokens.
More about GPT OSS 20B
GPT-OSS 20B is OpenAI's open-weight 21B-parameter Mixture-of-Experts model with 3.6B active per forward pass, available free on OpenRouter (also on Groq, Cerebras, and Cloudflare). Supports reasoning level configuration, fine-tuning, and agentic capabilities — function calling, tool use, and structured outputs. Trained in OpenAI's Harmony response format. Released under Apache 2.0. The low active parameter count enables lower-latency inference on consumer or single-GPU hardware. 131K context window. Text-only. OpenAI-compatible. Free tier: 200 RPD on OpenRouter.
For API keys, setup steps, and provider-level limits, see the NVIDIA NIM provider page.