LLMversus

Llama 3.1 405B vs Llama 3.1 8B: Pricing, Benchmarks & Verdict (2026)

Pricing verified Sep 14, 2026By LLMversusUpdated September 17, 2026View methodology

⚡ Quick Answer

Compare Llama 3.1 405B and Llama 3.1 8B across pricing, benchmarks, and capabilities.

Updated: September 14, 2026 · ✓ Pricing verified

Side-by-Side Comparison

FeatureLlama 3.1 405BLlama 3.1 8B
ProviderMetaMeta
Input Price / 1M tokens$3.00$0.050
Output Price / 1M tokens$3.00$0.080
Context Window
128K
128K
Max Output Tokens
4,096
4,096
Arena ELO
1,240
1,120
Coding ELO1,200N/A
TTFT (ms)
150
150
Tokens/sec
100
100
MultimodalNoNo
JSON ModeYesYes
Function CallingYesYes
VisionNoNo
When to Use Llama 3.1 405B

Llama 3.1 405B excels at general-purpose, reasoning, long-context tasks.

Strengths:

  • Largest open model
  • Excellent reasoning
  • High quality outputs

Best for:

general-purposereasoninglong-context
When to Use Llama 3.1 8B

Llama 3.1 8B excels at cost-effective, fast-inference tasks.

Strengths:

  • Very cheap
  • Super fast
  • Good for lightweight tasks

Best for:

cost-effectivefast-inference

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