Llama 3.1 405B vs GPT-3.5 Turbo

Compare Llama 3.1 405B by Meta AI against GPT-3.5 Turbo by OpenAI, context windows of 128K vs 16K, tested across 7 shared challenges. Updated March 2026.

Which is better, Llama 3.1 405B or GPT-3.5 Turbo?

Llama 3.1 405B and GPT-3.5 Turbo are both competitive models. Llama 3.1 405B costs $2.7/M input tokens vs $1.5/M for GPT-3.5 Turbo. Context windows: 128K vs 16K tokens. Compare their real outputs side by side below.

Key Differences Between Llama 3.1 405B and GPT-3.5 Turbo

Llama 3.1 405B is made by meta while GPT-3.5 Turbo is from openai. Llama 3.1 405B has a 128K token context window compared to GPT-3.5 Turbo's 16K. On pricing, Llama 3.1 405B costs $2.7/M input tokens vs $1.5/M for GPT-3.5 Turbo.

Our Verdict
Llama 3.1 405B
Llama 3.1 405B
GPT-3.5 Turbo
GPT-3.5 TurboRunner-up

No community votes yet. On paper, Llama 3.1 405B has the edge — bigger model tier, newer, bigger context window.

Slight edge
Writing DNA

Style Comparison

Similarity
92%

Llama 3.1 405B uses 2.9x more emoji

Llama 3.1 405B
GPT-3.5 Turbo
56%Vocabulary61%
15wSentence Length16w
0.41Hedging0.23
0.0Bold0.0
1.9Lists3.7
0.03Emoji0.00
0.00Headings0.00
0.16Transitions0.38
Based on 5 + 11 text responses
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Llama 3.1 405BGPT-3.5 Turbo
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