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Llama 3.1 405B vs o3: Pricing, Benchmarks & Verdict (2026)

Pricing verified Apr 8, 2026

⚡ Quick Answer

Compare Llama 3.1 405B and o3 across pricing, benchmarks, and capabilities.

Updated: April 8, 2026 · ✓ Pricing verified

Side-by-Side Comparison

FeatureLlama 3.1 405Bo3
ProviderMetaOpenAI
Input Price / 1M tokens$3.00$10.00
Output Price / 1M tokens$3.00$40.00
Context Window
128K
200K
Max Output Tokens
4,096
100,000
Arena ELO
1,240
1,340
Coding ELO
1,200
1,320
TTFT (ms)
150
600
Tokens/sec
100
15
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 o3

o3 excels at reasoning, coding, math tasks.

Strengths:

  • Highest reasoning capability
  • Best math performance
  • Code execution

Best for:

reasoningcodingmath

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