Gemini 2.5 Flash Lite Preview 09-2025 vs GPT-5 Pro: side-by-side summary

Gemini 2.5 Flash Lite Preview 09-2025 and GPT-5 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 Lite 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 Pro, from OpenAI, has a 400,000-token context window and is priced at $15/M tokens input, $120/M tokens output on OpenRouter.

Context window

• Gemini 2.5 Flash Lite Preview 09-2025: 1,048,576 tokens
• GPT-5 Pro: 400,000 tokens

Price

• Gemini 2.5 Flash Lite Preview 09-2025: Pricing varies by provider
• GPT-5 Pro: $15/M tokens input, $120/M tokens output

Provided by

• Gemini 2.5 Flash Lite Preview 09-2025: Google
• GPT-5 Pro: OpenAI

• Gemini 2.5 Flash Lite Preview 09-2025 model details, providers and pricing
• GPT-5 Pro model details, providers and pricing