All comparisons

Gemini 2.5 Flash vs o3

Side-by-side comparison of specifications, capabilities, and pricing.

	Gemini 2.5 Flash Google DeepMind	o3 OpenAI
Released	2025-06-17	2025-03-31
Context window	1M	128K
Parameters	—	—
Architecture	decoder only	decoder only
License	Proprietary	Unknown
Knowledge cutoff	2025-01	—
Capabilities
Vision
Multimodal
Reasoning
Function calling
Tool use
Structured Outputs
Code execution
Availability
Providers	Google AI StudioGCP Vertex AIReplicate APIOpenRouter	OpenAI APIOpenRouterOpenAI Batch API

Benchmarks

HumanEval90.196.7LiveCodeBench76.279.1Aider Polyglot55.181.3Chatbot Arena1320.01412.0Massive Multi-discipline Multimodal Understanding79.782.9BFCL56.2—MMLU PRO80.9—SWE-bench Verified—71.7Google-Proof Q&A—87.7