Claude Sonnet 4.6 vs GPT-5 Pro

Compare Claude Sonnet 4.6 by Anthropic against GPT-5 Pro by OpenAI, context windows of 1.0M vs 400K, tested across 41 shared challenges. Updated April 2026.

Which is better, Claude Sonnet 4.6 or GPT-5 Pro?

Claude Sonnet 4.6 and GPT-5 Pro are both competitive models. Claude Sonnet 4.6 costs $3/M input tokens vs $15/M for GPT-5 Pro. Context windows: 1000K vs 400K tokens. Compare their real outputs side by side below.

Key Differences Between Claude Sonnet 4.6 and GPT-5 Pro

Claude Sonnet 4.6 is made by anthropic while GPT-5 Pro is from openai. Claude Sonnet 4.6 has a 1000K token context window compared to GPT-5 Pro's 400K. On pricing, Claude Sonnet 4.6 costs $3/M input tokens vs $15/M for GPT-5 Pro.

Our Verdict
Claude Sonnet 4.6
Claude Sonnet 4.6
GPT-5 Pro
GPT-5 Pro

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Claude Sonnet 4.6 is 8.0x cheaper per token — worth considering if cost matters.

Too close to call
Writing DNA

Style Comparison

Similarity
91%

Claude Sonnet 4.6 uses 507.4x more bold

Claude Sonnet 4.6
GPT-5 Pro
56%Vocabulary65%
36wSentence Length15w
0.53Hedging0.32
5.1Bold0.0
3.4Lists2.9
0.19Emoji0.00
2.10Headings0.00
0.02Transitions0.01
Based on 23 + 11 text responses
vs

Ask them anything yourself

Claude Sonnet 4.6GPT-5 Pro

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
Free preview13 of 58 slides
FAQ

Common questions