GPT OSS 20B Free API on LLM7.io

Free API Verified

Available from LLM7.io

★★★★★★★★★★ 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.llm7.io/v1

Model ID

gpt-oss:20b

API format OpenAI Chat Completions

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 Aug 5, 2025

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 LLM7.io'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

14.9/100

Coding Programming and code generation

20.7/100

Agentic Tool use and multi-step tasks

3.1/100

Context Maximum listed context window

131K

Availability

GPT OSS 20B availability by provider

1 alternative

We found 2 provider listings for gpt-oss-20b. Check model ID, quota, pricing, and API format before switching providers.

Provider	Model listing	Access	Context	API	Limits
LLM7.io	GPT OSS 20B	Free tier	131K	Native	Varies
Ollama Cloud	gpt-oss:20b	Free tier	131K	OpenAI-style	Session/weekly limits (unpublished)

View LLM7.io setup guide →

Compare

GPT OSS 20B alternatives to consider

Open comparison

Model	Provider	Context	Access
gpt-oss:20b	Ollama Cloud	131K	Free tier
deepseek-r1-0528	LLM7.io	131K	Check provider
deepseek-v3-0324	LLM7.io	131K	Check provider
gpt-4o-mini	LLM7.io	131K	Check provider
mistral-small-3.1-24b	LLM7.io	32K	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 LLM7.io, 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 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 LLM7.io provider page.