Claude Opus 4 vs GPT-5.5
Compare Claude Opus 4 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 or GPT-5.5?
Claude Opus 4 and GPT-5.5 are both competitive models. Claude Opus 4 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 and GPT-5.5
Claude Opus 4 is made by anthropic while GPT-5.5 is from openai. Claude Opus 4 has a 200K token context window compared to GPT-5.5's 1050K. On pricing, Claude Opus 4 costs $15/M input tokens vs $5/M for GPT-5.5.
API pricing
Per 1M tokens
Claude Opus 4
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 4Runner-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
54%
Claude Opus 4 uses 11.2x more emoji
Claude Opus 4
GPT-5.5
64%Vocabulary58%
62wSentence Length18w
0.52Hedging0.74
4.4Bold2.9
9.1Lists5.1
0.11Emoji0.00
1.87Headings1.68
0.27Transitions0.03
Based on 16 + 26 text responses
FAQ
