DeepSeek R1 vs Gemini 2.5 Flash Preview (thinking)

Compare DeepSeek R1 by DeepSeek against Gemini 2.5 Flash Preview (thinking) by Google AI, context windows of 128K vs 1.0M, tested across 15 shared challenges. Updated March 2026.

Which is better, DeepSeek R1 or Gemini 2.5 Flash Preview (thinking)?

DeepSeek R1 and Gemini 2.5 Flash Preview (thinking) are both competitive models. DeepSeek R1 costs $0.55/M input tokens vs $0.175/M for Gemini 2.5 Flash Preview (thinking). Context windows: 128K vs 1049K tokens. Compare their real outputs side by side below.

Key Differences Between DeepSeek R1 and Gemini 2.5 Flash Preview (thinking)

DeepSeek R1 is made by deepseek while Gemini 2.5 Flash Preview (thinking) is from google. DeepSeek R1 has a 128K token context window compared to Gemini 2.5 Flash Preview (thinking)'s 1049K. On pricing, DeepSeek R1 costs $0.55/M input tokens vs $0.175/M for Gemini 2.5 Flash Preview (thinking).

Our Verdict
DeepSeek R1
DeepSeek R1
Gemini 2.5 Flash Preview (thinking)
Gemini 2.5 Flash Preview (thinking)

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Too close to call
vs

Ask them anything yourself

DeepSeek R1Gemini 2.5 Flash Preview (thinking)
FAQ