Comprehensive side-by-side LLM comparison
o3-pro offers 37.9K more tokens in context window than GPT OSS 120B. GPT OSS 120B is $99.46 cheaper per million tokens. o3-pro supports multimodal inputs. GPT OSS 120B is available on 5 providers. Both models have their strengths depending on your specific coding needs.
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
o3-pro was developed as the flagship reasoning model in the o3 family, designed to deliver maximum reasoning depth and reliability for the most challenging analytical tasks. Built for professionals requiring the highest level of thoughtful problem-solving, it extends reasoning capabilities to handle complex multi-step challenges across diverse domains.
1 month newer

o3-pro
OpenAI
2025-06-10

GPT OSS 120B
OpenAI
2025-08-05
Cost per million tokens (USD)

GPT OSS 120B

o3-pro
Context window and performance specifications
o3-pro
2024-05-31
Available providers and their performance metrics

GPT OSS 120B
DeepInfra
Groq
Novita
OpenAI
ZeroEval

GPT OSS 120B

o3-pro

GPT OSS 120B

o3-pro

o3-pro
OpenAI