Claude 3 Opus vs o1
Compare Claude 3 Opus by Anthropic against o1 by OpenAI, context windows of 200K vs 128K, tested across 12 shared challenges. Updated June 2026.
Which is better, Claude 3 Opus or o1?
Claude 3 Opus and o1 are both competitive models. Claude 3 Opus costs $15/M input tokens vs $15/M for o1. Context windows: 200K vs 128K tokens. Compare their real outputs side by side below.
Key Differences Between Claude 3 Opus and o1
Claude 3 Opus is made by anthropic while o1 is from openai. Claude 3 Opus has a 200K token context window compared to o1's 128K. On pricing, Claude 3 Opus costs $15/M input tokens vs $15/M for o1.
API pricing
Per 1M tokens
Claude 3 Opus
Input
$15.00
Output
$75.00
o1
Input
$15.00
Output
$60.00
1.3× cheaper
Our Verdict
Claude 3 Opus
o1Runner-up
No community votes yet. On paper, Claude 3 Opus has the edge — bigger model tier, bigger context window.
Too close to call
Writing DNA
Style Comparison
Similarity
51%
o1 uses 503.7x more bold
Claude 3 Opus
o1
54%Vocabulary64%
14wSentence Length16w
0.48Hedging0.76
0.0Bold5.0
3.0Lists2.6
0.00Emoji0.00
0.00Headings0.44
0.06Transitions0.40
Based on 3 + 13 text responses
FAQ
