Comprehensive side-by-side LLM comparison
Both models show comparable benchmark performance. Gemini 2.5 Pro Preview 06-05 offers 814.1K more tokens in context window than o3. o3 is $1.25 cheaper per million tokens. Both models have their strengths depending on your specific coding needs.
Gemini 2.5 Pro Preview was released as an early access version of Gemini 2.5 Pro, designed to allow developers and enterprises to experiment with next-generation capabilities before general availability. Built to gather feedback and demonstrate upcoming features, it provided a window into the evolution of Google's flagship model.
OpenAI
o3 represents the next generation in OpenAI's reasoning model series, developed to advance the capabilities of deliberate, step-by-step problem solving. Built to handle increasingly complex challenges across mathematics, science, and coding, it continues the evolution of reasoning-focused AI with improved analytical depth and accuracy.
1 month newer

o3
OpenAI
2025-04-16

Gemini 2.5 Pro Preview 06-05
2025-06-05
Cost per million tokens (USD)

Gemini 2.5 Pro Preview 06-05

o3
Context window and performance specifications
Average performance across 7 common benchmarks

Gemini 2.5 Pro Preview 06-05

o3
Performance comparison across key benchmark categories

Gemini 2.5 Pro Preview 06-05

o3
o3
2024-05-31
Gemini 2.5 Pro Preview 06-05
2025-01-31
Available providers and their performance metrics

Gemini 2.5 Pro Preview 06-05

o3

Gemini 2.5 Pro Preview 06-05

o3

Gemini 2.5 Pro Preview 06-05

o3
OpenAI