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Claude Sonnet 4 vs GPT-4 1.5-nano: Pricing, Benchmarks & Verdict (2026)

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

⚡ Quick Answer

GPT-4.1 Nano is significantly cheaper at $0.10/$0.40 per million tokens vs $3.00/$15.00. Claude Sonnet 4 is stronger for coding with a coding ELO of 1305 vs 1150. GPT-4.1 Nano is faster at 150 tokens/sec vs 78 tokens/sec. Claude Sonnet 4 ranks higher overall with an Arena ELO of 1280 vs 1180. GPT-4.1 Nano offers a larger 1048K context window vs 200K.

Updated: September 14, 2026 · ✓ Pricing verified

Side-by-Side Comparison

FeatureClaude Sonnet 4GPT-4 1.5-nano
ProviderAnthropicOpenAI
Input Price / 1M tokens$2.00$0.100
Output Price / 1M tokens$10.00$0.400
Context Window
200K
128K
Max Output Tokens
64,000
4,096
Arena ELO
1,473
1,150
Coding ELO
1,473
1,160
TTFT (ms)
320
120
Tokens/sec
78
150
MultimodalYesNo
JSON ModeYesYes
Function CallingYesYes
VisionYesNo
When to Use Claude Sonnet 4

Choose Claude Sonnet 4 when you need: best-in-class coding performance, 200k context window, excellent instruction following. It 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 1.5-nano

Choose GPT-4.1 Nano when you need: ultra-low pricing, 1m context window, very fast inference, ideal for simple tasks at scale. It excels at chatbots, classification, cost-sensitive, high-volume tasks. It is also the more cost-effective option between the two. Its 1048K context window is larger, making it better for long-document processing.

Strengths:

  • Super cheap
  • Very fast
  • Large context

Best for:

cost-effectivefast-inference

Frequently Asked Questions

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