Claude Sonnet 4.5
Nothing here. The model returned empty. We stared at it for a while.
Claude Sonnet 4.5 vs GPT-4o (Omni)
Compare Claude Sonnet 4.5 by Anthropic against GPT-4o (Omni) by OpenAI, context windows of 200K vs 128K, tested across 42 shared challenges. Updated April 2026.
Which is better, Claude Sonnet 4.5 or GPT-4o (Omni)?
Claude Sonnet 4.5 and GPT-4o (Omni) are both competitive models. Claude Sonnet 4.5 costs $3/M input tokens vs $2.5/M for GPT-4o (Omni). Context windows: 200K vs 128K tokens. Compare their real outputs side by side below.
Key Differences Between Claude Sonnet 4.5 and GPT-4o (Omni)
Claude Sonnet 4.5 is made by anthropic while GPT-4o (Omni) is from openai. Claude Sonnet 4.5 has a 200K token context window compared to GPT-4o (Omni)'s 128K. On pricing, Claude Sonnet 4.5 costs $3/M input tokens vs $2.5/M for GPT-4o (Omni).
Our Verdict
Claude Sonnet 4.5
GPT-4o (Omni)
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Too close to call
Writing DNA
Style Comparison
Similarity
100%
Claude Sonnet 4.5 uses 18.0x more emoji
Claude Sonnet 4.5
GPT-4o (Omni)
64%Vocabulary54%
94wSentence Length18w
0.48Hedging0.72
4.9Bold7.3
8.0Lists5.6
0.45Emoji0.03
1.91Headings1.40
0.07Transitions0.26
Based on 20 + 24 text responses
vsAsk them anything yourself
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
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