Comprehensive side-by-side LLM comparison
GPT OSS 120B leads with 9.4% higher average benchmark score. Both models have similar pricing. Overall, GPT OSS 120B is the stronger choice for coding tasks.
OpenAI
GPT-OSS 120B was developed as an open-source model release from OpenAI, designed to provide the research and developer community with access to a capable language model. Built with 120 billion parameters, it enables experimentation, fine-tuning, and deployment in contexts where open-source licensing and transparency are valued.
OpenAI
GPT-OSS 20B was created as a smaller open-source variant, designed to balance capability with accessibility for researchers and developers. Built with 20 billion parameters, it provides a more approachable entry point for those seeking to work with open-source language models while benefiting from OpenAI's architectural insights.
Launched on the same date

GPT OSS 120B
OpenAI
2025-08-05

GPT OSS 20B
OpenAI
2025-08-05
Cost per million tokens (USD)

GPT OSS 120B

GPT OSS 20B
Context window and performance specifications
Average performance across 7 common benchmarks

GPT OSS 120B

GPT OSS 20B
Available providers and their performance metrics

GPT OSS 120B
DeepInfra
Groq
Novita
OpenAI
ZeroEval

GPT OSS 120B

GPT OSS 20B

GPT OSS 120B

GPT OSS 20B

GPT OSS 20B
Groq
Novita
OpenAI
ZeroEval