Claude Opus 4.1 vs GPT-5.5
Compare Claude Opus 4.1 by Anthropic against GPT-5.5 by OpenAI, context windows of 200K vs 1.1M, tested across 53 shared challenges. Updated April 2026.
Which is better, Claude Opus 4.1 or GPT-5.5?
Claude Opus 4.1 and GPT-5.5 are both competitive models. Claude Opus 4.1 costs $15/M input tokens vs $5/M for GPT-5.5. Context windows: 200K vs 1050K tokens. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4.1 and GPT-5.5
Claude Opus 4.1 is made by anthropic while GPT-5.5 is from openai. Claude Opus 4.1 has a 200K token context window compared to GPT-5.5's 1050K. On pricing, Claude Opus 4.1 costs $15/M input tokens vs $5/M for GPT-5.5.
API pricing
Per 1M tokens
Claude Opus 4.1
Input
$15.00
Output
$75.00
GPT-5.5
Input
$5.00
3.0× cheaper
Output
$30.00
2.5× cheaper
GPT-5.5 is cheaper on both — 3.0× input, 2.5× output
Our Verdict
GPT-5.5
Claude Opus 4.1Runner-up
No community votes yet. On paper, GPT-5.5 has the edge — newer, bigger context window.
Too close to call
Writing DNA
Style Comparison
Similarity
63%
Claude Opus 4.1 uses 38.4x more emoji
Claude Opus 4.1
GPT-5.5
61%Vocabulary58%
87wSentence Length18w
0.54Hedging0.74
5.1Bold2.9
6.7Lists5.1
0.38Emoji0.00
1.68Headings1.68
0.13Transitions0.03
Based on 17 + 26 text responses
FAQ
