Claude Sonnet 4 vs GPT-5 Codex
Compare Claude Sonnet 4 by Anthropic against GPT-5 Codex by OpenAI, in 101 community votes, claude sonnet 4 and gpt-5 codex are closely matched, tested across 50 shared challenges.
Web Design: GPT-5 Codex wins 56% of votes
Image Generation: Claude Sonnet 4 wins 56% of votes
Reasoning: GPT-5 Codex wins 60% of votes
Analysis: Claude Sonnet 4 and GPT-5 Codex are tied
Conversation: Claude Sonnet 4 and GPT-5 Codex are tied
Our Verdict
Claude Sonnet 4
GPT-5 Codex
Too close to call. Pick based on your use case.
Pick Claude Sonnet 4 for Image Generation. Pick GPT-5 Codex for Reasoning, Web Design.
Too close to call
API pricing
Cost per 1M tokens
Claude Sonnet 4
Input
$3.00
Output
$15.00
GPT-5 Codex
Input
—
Output
—
Writing DNA
Style Comparison
Similarity
35%
Claude Sonnet 4 uses 6.4x more sentence length
Claude Sonnet 4
GPT-5 Codex
62%Vocabulary64%
111wSentence Length17w
0.40Hedging0.38
5.0Bold2.3
9.3Lists3.5
0.88Emoji0.15
2.16Headings0.49
0.33Transitions0.05
Based on 17 + 13 text responses
Research
What we learned reading every model
FAQ
