LLMversus

GPT-4.5 vs o3: Pricing, Benchmarks & Verdict (2026)

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

⚡ Quick Answer

Compare GPT-4.5 and o3 across pricing, benchmarks, and capabilities.

Updated: August 3, 2026 · ✓ Pricing verified

Side-by-Side Comparison

FeatureGPT-4.5o3
ProviderOpenAIOpenAI
Input Price / 1M tokens$75.00$2.00
Output Price / 1M tokens$150.00$8.00
Context Window
128K
200K
Max Output Tokens
8,192
100,000
Arena ELO
1,290
1,340
Coding ELO
1,295
1,320
TTFT (ms)
150
600
Tokens/sec
100
15
MultimodalYesNo
JSON ModeYesYes
Function CallingYesYes
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 o3

o3 excels at reasoning, coding, math tasks.

Strengths:

  • Highest reasoning capability
  • Best math performance
  • Code execution

Best for:

reasoningcodingmath

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