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

Pricing verified Apr 8, 2026

⚡ Quick Answer

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

Updated: April 8, 2026 · ✓ Pricing verified

Side-by-Side Comparison

Featureo3Phi-3.5 Mini
ProviderOpenAIMicrosoft
Input Price / 1M tokens$10.00$0.130
Output Price / 1M tokens$40.00$0.520
Context Window
200K
128K
Max Output Tokens
100,000
4,096
Arena ELO
1,340
1,160
Coding ELO
1,320
1,165
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 Mini

Phi-3.5 Mini excels at cost-effective, fast-inference tasks.

Strengths:

  • Very cheap
  • Fast
  • Large context

Best for:

cost-effectivefast-inference

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