Omibox

Claude 3.5 SonnetVSLlama 3.1 405B

Claude 3.5 Sonnet

Claude 3.5 Sonnet

Claude 3.5 Sonnet AI Model

Read Full Review
VS
Llama 3.1 405B

Llama 3.1 405B

Llama 3.1 405B AI Model

Read Full Review

Select Your Role for Personalized Verdict

casual Verdict

These two are neck-and-neck industry leaders. [Claude](/lab?model=anthropic/claude-3.5-sonnet) 3.5 Sonnet (Elo 1272) and Llama 3.1 405B (Elo 1266) are practically indistinguishable in daily tasks.
Data Verified from Authority Sources

Benchmarks including **LMSYS Chatbot Arena Elo** and **HumanEval Pass@1** are sourced from public leaderboards as of **2025/2026**. These metrics are indicative and may change as models are updated by providers.

LMSYS Leaderboard HumanEval Benchmark

Scores based on normalized benchmarks (0-100 scale)

Feature Comparison

FeatureClaude 3.5 SonnetLlama 3.1 405B
ProviderAnthropicMeta
Release Date2024-062024-07
Context Window200000128000
Pricing (Input)3 / per 1M tokens0 / Open Source
Pricing (Output)15 / per 1M tokens0 / Open Source
Pros
  • Superior coding and debugging capabilities (Artifacts UI)
  • More natural, human-like writing style
  • Massive 200k context window with perfect recall
  • Open Weights - can be run privately or fine-tuned
  • Exceptional multi-lingual performance
  • Free to use if self-hosted
Cons
  • Lacks native web search capability (uses tools)
  • Slightly slower than GPT-4o in short bursts
  • Requires massive hardware to run locally (405B params)
  • No native vision capabilities (text-only)

Methodology

We compared Claude 3.5 Sonnet and Llama 3.1 405B based on real-world usage tests, official technical benchmarks, and community feedback. Our scoring system evaluates speed, reasoning capabilities (MMLU benchmarks), and coding proficiency.

Last updated: 1/17/2026