Google's high-speed thinking model for agentic workflows, chat, and coding.
OpenAI's most powerful reasoning model — top across math, coding, and science.
No shared demos for these models yet.
No captured outputs for these models yet.
Based on the Capability Index, Gemini 3.5 Flash scores higher (86.2 vs 79.2). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.
Gemini 3.5 Flash has a lower blended cost. Gemini 3.5 Flash: $1.50 input / $9.00 output. o3: $2.00 input / $8.00 output.
Gemini 3.5 Flash has a larger context window: Gemini 3.5 Flash supports 1M tokens vs o3 at 200K tokens.
Yes, both Gemini 3.5 Flash and o3 support vision/image input.
Gemini 3.5 Flash scores higher on SWE-bench Verified: Gemini 3.5 Flash resolves 79% vs o3 at 62%.
Key differences: Gemini 3.5 Flash has a notably higher capability index (7.0 point gap). Compare full specs on this page.
If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both Gemini 3.5 Flash and o3 for free on idapt.app to see which performs better for your specific needs.