All comparisons

o3 vs Gemini 2.5 Pro

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

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

Benchmarks

HumanEval96.793.1SWE-bench Verified71.763.2LiveCodeBench79.170.4Aider Polyglot81.3—Chatbot Arena1412.01398.0Google-Proof Q&A87.786.4Massive Multi-discipline Multimodal Understanding82.9—MMLU PRO—86.2