Claude Opus 4.8 vs OpenAI o3
Compare Claude Opus 4.8 by Anthropic against OpenAI o3 by OpenAI, tested across 53 shared challenges. Updated May 2026.
Which is better, Claude Opus 4.8 or OpenAI o3?
Claude Opus 4.8 and OpenAI o3 are both competitive models. Claude Opus 4.8 costs $5/M input tokens vs $10/M for OpenAI o3. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4.8 and OpenAI o3
Claude Opus 4.8 is made by anthropic while OpenAI o3 is from openai. On pricing, Claude Opus 4.8 costs $5/M input tokens vs $10/M for OpenAI o3.
API pricing
Per 1M tokens
Claude Opus 4.8
Input
$5.00
2.0× cheaper
Output
$25.00
1.6× cheaper
OpenAI o3
Input
$10.00
Output
$40.00
Claude Opus 4.8 is cheaper on both — 2.0× input, 1.6× output
Our Verdict
Claude Opus 4.8
OpenAI o3
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
54%
Claude Opus 4.8 uses 77.6x more emoji
Claude Opus 4.8
OpenAI o3
60%Vocabulary68%
19wSentence Length14w
0.46Hedging0.26
4.7Bold0.7
3.2Lists3.0
0.78Emoji0.00
1.15Headings0.38
0.04Transitions0.12
Based on 27 + 16 text responses
FAQ
