LLM ReferenceLLM Reference

gpt-oss-20b

gpt-oss-20b

Open Source

About

OpenAI open-weight model with 20 billion parameters. Lightweight, efficient text-only model with reasoning and function calling. Free for self-hosting. Released August 5, 2025.

gpt-oss-20b has a 128K-token context window.

gpt-oss-20b input tokens at $0.03/1M, output at $0.14/1M.

Capabilities

VisionMultimodalReasoningFunction CallingTool UseStructured OutputsCode ExecutionPrompt CachingBatch APIAudioFine-tuning

Providers(6)

Compare all →
ProviderInput (per 1M)Output (per 1M)Type
OpenRouter$0.03$0.14Serverless
Fireworks AI$0.07$0.3Serverless
GCP Vertex AI$0.07$0.25Serverless
NVIDIA NIM——Serverless
GroqCloud$0.075$0.30Serverless
Replicate API$0.09$0.36Serverless

Benchmark Scores(1)

BenchmarkScoreVersionSource
Google-Proof Q&A68.8diamondArtificial Analysis

Rankings

Best AI Agents & Agentic ModelsBest Open Source LLMsBest LLMs for Reasoning & MathBest LLMs for Function Calling & Tool UseCheapest LLM APIsBest Long Context LLMsBest LLM APIsBest LLMs for EnterpriseBest Free LLMsBest LLMs for WritingBest LLMs for MarketingBest LLMs for Customer Support

Specifications

FamilyGPT-OSS
Released2025-08-05
Parameters20B
Context131K
ArchitectureDecoder Only
Knowledge cutoff2025-08
Specializationgeneral
Trainingpretrained

Created by

OpenAIOpenAI

Cutting-edge research and development.

San Francisco, California, United States
Founded 2015
Website

Providers(6)

OpenRouterFireworks AIGCP Vertex AINVIDIA NIMGroqCloudReplicate API