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

Pricing verified Apr 8, 2026

⚡ Quick Answer

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

Updated: April 8, 2026 · ✓ Pricing verified

Side-by-Side Comparison

FeatureClaude Sonnet 4GPT-4.5
ProviderAnthropicOpenAI
Input Price / 1M tokens$3.00$75.00
Output Price / 1M tokens$15.00$150.00
Context Window
200K
128K
Max Output Tokens
64,000
8,192
Arena ELO
1,280
1,290
Coding ELO
1,305
1,295
TTFT (ms)
320
150
Tokens/sec
78
100
MultimodalYesYes
JSON ModeYesYes
Function CallingYesYes
VisionYesYes
When to Use Claude Sonnet 4

Claude Sonnet 4 excels at coding, analysis, long-context, agents tasks.

Strengths:

  • Best-in-class coding performance
  • 200K context window
  • Excellent instruction following

Best for:

codinganalysislong-contextagents
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

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