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

Pricing verified Apr 8, 2026

⚡ Quick Answer

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

Updated: April 8, 2026 · ✓ Pricing verified

Side-by-Side Comparison

Featureo3-miniPhi-3.5 Mini
ProviderOpenAIMicrosoft
Input Price / 1M tokens$1.10$0.130
Output Price / 1M tokens$4.40$0.520
Context Window
128K
128K
Max Output Tokens
65,536
4,096
Arena ELO
1,280
1,160
Coding ELO
1,285
1,165
TTFT (ms)
350
150
Tokens/sec
25
100
MultimodalNoNo
JSON ModeYesYes
Function CallingNoYes
VisionNoNo
When to Use o3-mini

o3-mini excels at reasoning, math, general-purpose tasks.

Strengths:

  • Strong reasoning
  • Good math skills
  • Affordable reasoning

Best for:

reasoningmathgeneral-purpose
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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