Comprehensive side-by-side LLM comparison
o3-pro supports multimodal inputs. Both models have their strengths depending on your specific coding needs.
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.
Microsoft
Phi-3.5 MoE was created using a mixture-of-experts architecture, designed to provide enhanced capabilities while maintaining efficiency through sparse activation. Built to combine the benefits of larger models with practical computational requirements, it represents Microsoft's exploration of efficient scaling techniques.
9 months newer

Phi-3.5-MoE-instruct
Microsoft
2024-08-23

o3-pro
OpenAI
2025-06-10
Context window and performance specifications
o3-pro
2024-05-31
Available providers and their performance metrics

o3-pro
OpenAI

Phi-3.5-MoE-instruct

o3-pro

Phi-3.5-MoE-instruct

o3-pro

Phi-3.5-MoE-instruct