Overview
Gemini 2.5 Flash Preview 09-2025 vs o3 Pro: side-by-side summary
Gemini 2.5 Flash Preview 09-2025 and o3 Pro are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Gemini 2.5 Flash Preview 09-2025, from Google, has a 1,048,576-token context window and is priced by the provider serving it on OpenRouter.
o3 Pro, from OpenAI, has a 200,000-token context window and is priced at $20/M tokens input, $80/M tokens output on OpenRouter.
- Context window
- Gemini 2.5 Flash Preview 09-2025: 1,048,576 tokens
- o3 Pro: 200,000 tokens
- Price
- Gemini 2.5 Flash Preview 09-2025: Pricing varies by provider
- o3 Pro: $20/M tokens input, $80/M tokens output
- Provided by
- Gemini 2.5 Flash Preview 09-2025: Google
- o3 Pro: OpenAI