Overview
Gemini 2.5 Flash Preview 09-2025 vs GPT-5 Codex: side-by-side summary
Gemini 2.5 Flash Preview 09-2025 and GPT-5 Codex 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.
GPT-5 Codex, from OpenAI, has a 400,000-token context window and is priced by the provider serving it on OpenRouter.
- Context window
- Gemini 2.5 Flash Preview 09-2025: 1,048,576 tokens
- GPT-5 Codex: 400,000 tokens
- Price
- Gemini 2.5 Flash Preview 09-2025: Pricing varies by provider
- GPT-5 Codex: Pricing varies by provider
- Provided by
- Gemini 2.5 Flash Preview 09-2025: Google
- GPT-5 Codex: OpenAI