Grok 3 Thinking vs Gemini 2.5 Flash Preview (thinking)

Compare Grok 3 Thinking by xAI against Gemini 2.5 Flash Preview (thinking) by Google AI, context windows of 128K vs 1.0M, tested across 9 shared challenges. Updated March 2026.

Which is better, Grok 3 Thinking or Gemini 2.5 Flash Preview (thinking)?

Grok 3 Thinking and Gemini 2.5 Flash Preview (thinking) are both competitive models. Context windows: 128K vs 1049K tokens. Compare their real outputs side by side below.

Key Differences Between Grok 3 Thinking and Gemini 2.5 Flash Preview (thinking)

Grok 3 Thinking is made by xai while Gemini 2.5 Flash Preview (thinking) is from google. Grok 3 Thinking has a 128K token context window compared to Gemini 2.5 Flash Preview (thinking)'s 1049K.

Our Verdict
Grok 3 Thinking
Grok 3 Thinking
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
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Grok 3 ThinkingGemini 2.5 Flash Preview (thinking)
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