LLMversus

Grok 3 vs Llama 3.1 405B: Pricing, Benchmarks & Verdict (2026)

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

⚡ Quick Answer

Compare Grok 3 and Llama 3.1 405B across pricing, benchmarks, and capabilities.

Updated: September 14, 2026 · ✓ Pricing verified

Side-by-Side Comparison

FeatureGrok 3Llama 3.1 405B
ProviderxAIMeta
Input Price / 1M tokens$3.00$3.00
Output Price / 1M tokens$15.00$3.00
Context Window
200K
128K
Max Output Tokens
8,192
4,096
Arena ELO
1,285
1,240
Coding ELO
1,280
1,200
TTFT (ms)
200
150
Tokens/sec
90
100
MultimodalNoNo
JSON ModeYesYes
Function CallingYesYes
VisionNoNo
When to Use Grok 3

Grok 3 excels at general-purpose, coding, reasoning tasks.

Strengths:

  • Latest xAI model
  • Strong reasoning
  • Large context

Best for:

general-purposecodingreasoning
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

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