GPT-5.1
Nothing here. The model returned empty. We stared at it for a while.
GPT-5.1 vs Claude Opus 4
Compare GPT-5.1 by OpenAI against Claude Opus 4 by Anthropic, context windows of 400K vs 200K, tested across 33 shared challenges. Updated April 2026.
Which is better, GPT-5.1 or Claude Opus 4?
GPT-5.1 and Claude Opus 4 are both competitive models. GPT-5.1 costs $1.25/M input tokens vs $15/M for Claude Opus 4. Context windows: 400K vs 200K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-5.1 and Claude Opus 4
GPT-5.1 is made by openai while Claude Opus 4 is from anthropic. GPT-5.1 has a 400K token context window compared to Claude Opus 4's 200K. On pricing, GPT-5.1 costs $1.25/M input tokens vs $15/M for Claude Opus 4.
Our Verdict
GPT-5.1
Claude Opus 4Runner-up
No community votes yet. On paper, GPT-5.1 has the edge — newer, bigger context window.
GPT-5.1 is 7.5x cheaper per token — worth considering if cost matters.
Too close to call
Writing DNA
Style Comparison
Similarity
100%
Claude Opus 4 uses 11.2x more emoji
GPT-5.1
Claude Opus 4
62%Vocabulary64%
19wSentence Length62w
0.29Hedging0.52
3.5Bold4.4
7.2Lists9.1
0.00Emoji0.11
0.61Headings1.87
0.03Transitions0.27
Based on 14 + 16 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.
Free preview13 of 58 slides
FAQ