DeepSeek V3.1 vs Gemini 2.5 Flash: side-by-side summary

DeepSeek V3.1 and Gemini 2.5 Flash are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

DeepSeek V3.1, from DeepSeek, has a 163,840-token context window and is priced at $0.25/M tokens input, $0.95/M tokens output on OpenRouter.

Gemini 2.5 Flash, from Google, has a 1,048,576-token context window and is priced at $0.30/M tokens input, $2.50/M tokens output on OpenRouter.

Context window

• DeepSeek V3.1: 163,840 tokens
• Gemini 2.5 Flash: 1,048,576 tokens

Price

• DeepSeek V3.1: $0.25/M tokens input, $0.95/M tokens output
• Gemini 2.5 Flash: $0.30/M tokens input, $2.50/M tokens output

Provided by

• DeepSeek V3.1: DeepSeek
• Gemini 2.5 Flash: Google

• DeepSeek V3.1 model details, providers and pricing
• Gemini 2.5 Flash model details, providers and pricing