Llama 3.1 405B vs Gemini 2.5 Flash Preview (thinking)

Compare Llama 3.1 405B by Meta AI against Gemini 2.5 Flash Preview (thinking) by Google AI, context windows of 128K vs 1.0M, tested across 5 shared challenges. Updated March 2026.

Which is better, Llama 3.1 405B or Gemini 2.5 Flash Preview (thinking)?

Llama 3.1 405B and Gemini 2.5 Flash Preview (thinking) are both competitive models. Llama 3.1 405B costs $2.7/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 Llama 3.1 405B and Gemini 2.5 Flash Preview (thinking)

Llama 3.1 405B is made by meta while Gemini 2.5 Flash Preview (thinking) is from google. Llama 3.1 405B has a 128K token context window compared to Gemini 2.5 Flash Preview (thinking)'s 1049K. On pricing, Llama 3.1 405B costs $2.7/M input tokens vs $0.175/M for Gemini 2.5 Flash Preview (thinking).

Our Verdict
Llama 3.1 405B
Llama 3.1 405B
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
Writing DNA

Style Comparison

Similarity
66%

Gemini 2.5 Flash Preview (thinking) uses 443.3x more bold

Llama 3.1 405B
Gemini 2.5 Flash Preview (thinking)
56%Vocabulary53%
15wSentence Length14w
0.41Hedging0.38
0.0Bold4.4
1.9Lists4.1
0.03Emoji0.00
0.00Headings0.00
0.16Transitions0.24
Based on 5 + 7 text responses
vs

Ask them anything yourself

Llama 3.1 405BGemini 2.5 Flash Preview (thinking)
FAQ