GPT OSS 20B Free API on Groq

Free API Verified

Available from Groq

★★★★★★★★★★ 3.5 Benchmark-backed score

Open GPT reasoning model for self-hosted agents and controllable deployments

Free APIOpenAI compatibleReasoningTool callingJSON modeReasoning

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API Details

Copy-ready connection details

Use these values in your client or SDK.

Base URL

https://api.groq.com/openai/v1

Model ID

openai/gpt-oss-20b

API format OpenAI Chat Completions + OpenAI Responses

Technical Details

GPT OSS 20B specifications

Provider and model catalog

Context window 131K

Max output 33K

Status Online

Family gpt-oss

Released Aug 5, 2025

Last updated Aug 5, 2025

Free listing since Oct 7, 2026

Input text

Output text

Capabilities reasoning, tool calling, structured output, temperature control

Open weights Yes

Weights Hugging Face

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 Groq's free tier is enough for evaluation, demos, or light production traffic.

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

Benchmark Overview

Benchmark signals for GPT OSS 20B

Measured data

Intelligence General reasoning and instruction following

9/100

Coding Programming and code generation

20.7/100

Agentic Tool use and multi-step tasks

1.2/100

Speed Observed generation speed

190 tok/s

Context Maximum listed context window

131K

Pricing

GPT OSS 20B pricing per 1M tokens

Free tier listed

Input $0.07 per 1M tokens

Output $0.18 per 1M tokens

Access Available Groq

Availability

GPT OSS 20B availability by provider

Current provider only

We only found this GPT OSS 20B listing on Groq in the current catalog. Use the related models section for nearby alternatives.

Provider	Model listing	Access	Context	API	Limits
Groq	GPT OSS 20B	Free tier	131K	Native	Varies

View Groq setup guide →

Compare

GPT OSS 20B alternatives to consider

Open comparison

Model	Provider	Context	Access
Moonshot Kimi K2	Groq	131K	Check provider
Moonshot Kimi K2 0905	Groq	131K	Check provider
groq/compound	Groq	131K	Check provider
groq/compound-mini	Groq	131K	Check provider
llama-4-scout-17b-16e-instruct	Groq	131K	Check provider

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 Groq, 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

Free GPT OSS 20B API.

For API keys, setup steps, and provider-level limits, see the Groq provider page.