Comprehensive side-by-side LLM comparison
o3 Pro offers 155.6K more tokens in context window than GPT-4o. GPT-4o is $87.50 cheaper per million tokens. Both models have their strengths depending on your specific coding needs.
OpenAI
GPT-4o, released by OpenAI in May 2024, is a multimodal large language model from the GPT-4 family that natively processes text, image, and audio inputs in a single end-to-end model. It features a 128K token context window and demonstrated competitive performance across coding, reasoning, and vision benchmarks at its release. GPT-4o targets general-purpose assistant applications, vision-enabled workflows, and use cases requiring low-latency multimodal understanding.
OpenAI
OpenAI o3-pro, released by OpenAI in June 2025, is an extended reasoning model from the o3 family that applies more compute per response to deliver deeper, more thorough answers on complex problems. It features a 200K token context window, 100K maximum output tokens, and vision capabilities. o3-pro targets research-grade reasoning tasks, extended coding sessions, and applications where accuracy on difficult problems justifies higher inference cost and latency.
1 year newer

GPT-4o
OpenAI
2024-05-13

o3 Pro
OpenAI
2025-06-10
Cost per million tokens (USD)
GPT-4o
o3 Pro
Context window and performance specifications
GPT-4o
2024-04
Available providers and their performance metrics
GPT-4o
OpenAI
o3 Pro
GPT-4o
o3 Pro
GPT-4o
o3 Pro
OpenAI