Comprehensive side-by-side LLM comparison
o3 leads with 8.4% higher average benchmark score. Gemini 2.5 Flash offers 814.1K more tokens in context window than o3. Gemini 2.5 Flash is $7.20 cheaper per million tokens. Overall, o3 is the stronger choice for coding tasks.
Gemini 2.5 Flash represents a continued evolution of Google's efficient multimodal models, designed to deliver enhanced capabilities while maintaining the performance characteristics valued in the Flash series. Built to serve high-throughput applications with improved quality, it advances the balance between speed and intelligence.
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 Flash
2025-05-20
Cost per million tokens (USD)

Gemini 2.5 Flash

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

Gemini 2.5 Flash

o3
Performance comparison across key benchmark categories

Gemini 2.5 Flash

o3
o3
2024-05-31
Gemini 2.5 Flash
2025-01-31
Available providers and their performance metrics

Gemini 2.5 Flash
ZeroEval


Gemini 2.5 Flash

o3

Gemini 2.5 Flash

o3
o3
OpenAI