gpt-oss-20b vs DeepSeek V3

Side-by-side comparison of specifications, capabilities, and pricing.

	gpt-oss-20b OpenAI	DeepSeek V3 DeepSeek
Released	2025-08-05	2024-12-26
Context window	131K	64k
Parameters	20B	671B
Architecture	decoder only	mixture of experts
License	Open Source	Open Source
Knowledge cutoff	2025-08	2024-04
Capabilities
Vision
Multimodal
Reasoning
Function calling
Tool use
Structured Outputs
Code execution
Availability
Providers	OpenRouter Fireworks AI GCP Vertex AI NVIDIA NIM GroqCloud Replicate API	DeepInfra Fireworks AI DeepSeek Platform Microsoft Foundry OpenRouter NVIDIA NIM AWS Bedrock Together AI Bitdeer AI SiliconFlow Replicate API

Benchmarks

Google-Proof Q&A68.8—HellaSwag—95.7HumanEval—85.5Massive Multitask Language Understanding—88.5LiveCodeBench—49.6Aider Polyglot—48.4BigCodeBench—50.0Chatbot Arena—1302.0MMLU PRO—75.9

Full gpt-oss-20b specs →Full DeepSeek V3 specs →