LLMversus

GPT-4.5 vs Phi-4: Pricing, Benchmarks & Verdict (2026)

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

⚡ Quick Answer

Compare GPT-4.5 and Phi-4 across pricing, benchmarks, and capabilities.

Updated: September 14, 2026 · ✓ Pricing verified

Side-by-Side Comparison

FeatureGPT-4.5Phi-4
ProviderOpenAIMicrosoft
Input Price / 1M tokens$75.00$0.070
Output Price / 1M tokens$150.00$0.140
Context Window
128K
16.384K
Max Output Tokens
8,192
4,096
Arena ELO
1,290
1,150
Coding ELO
1,295
1,130
TTFT (ms)
150
100
Tokens/sec
100
160
MultimodalYesNo
JSON ModeYesYes
Function CallingYesNo
VisionYesNo
When to Use GPT-4.5

GPT-4.5 excels at multimodal, vision, general-purpose tasks.

Strengths:

  • Latest OpenAI model
  • Strong multimodal
  • Fast inference

Best for:

multimodalvisiongeneral-purpose
When to Use Phi-4

Phi-4 excels at cost-sensitive, edge-deployment, math, lightweight-tasks tasks.

Strengths:

  • Ultra-low cost for a capable model
  • Strong math for its size (14B params)
  • Very fast inference
  • Can run on consumer hardware

Best for:

cost-sensitiveedge-deploymentmathlightweight-tasks

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