LLMversus

o3 vs Phi-3.5 MoE: Pricing, Benchmarks & Verdict (2026)

Pricing verified Aug 3, 2026By LLMversusUpdated August 8, 2026View methodology

⚡ Quick Answer

Compare o3 and Phi-3.5 MoE across pricing, benchmarks, and capabilities.

Updated: August 3, 2026 · ✓ Pricing verified

Side-by-Side Comparison

Featureo3Phi-3.5 MoE
ProviderOpenAIMicrosoft
Input Price / 1M tokens$2.00$0.170
Output Price / 1M tokens$8.00$0.680
Context Window
200K
128K
Max Output Tokens
100,000
4,096
Arena ELO
1,340
1,195
Coding ELO
1,320
1,190
TTFT (ms)
600
150
Tokens/sec
15
100
MultimodalNoNo
JSON ModeYesYes
Function CallingYesYes
VisionNoNo
When to Use o3

o3 excels at reasoning, coding, math tasks.

Strengths:

  • Highest reasoning capability
  • Best math performance
  • Code execution

Best for:

reasoningcodingmath
When to Use Phi-3.5 MoE

Phi-3.5 MoE excels at general-purpose, cost-effective tasks.

Strengths:

  • Mixture of experts
  • Efficient
  • Balanced performance

Best for:

general-purposecost-effective

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