GPT-5.1 Codex Max vs Sonar Pro Search
Compare GPT-5.1 Codex Max by OpenAI against Sonar Pro Search by Perplexity, tested across 53 shared challenges. Updated April 2026.
Which is better, GPT-5.1 Codex Max or Sonar Pro Search?
GPT-5.1 Codex Max and Sonar Pro Search are both competitive models. Compare their real outputs side by side below.
Key Differences Between GPT-5.1 Codex Max and Sonar Pro Search
GPT-5.1 Codex Max is made by openai while Sonar Pro Search is from perplexity.
No community votes yet. On paper, GPT-5.1 Codex Max has the edge — bigger model tier, newer, major provider backing.
Style Comparison
Sonar Pro Search uses 16.9x more headings
vs
Ask them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
