GPT-5.1-Codex vs Sonar Pro Search
Compare GPT-5.1-Codex by OpenAI against Sonar Pro Search by Perplexity, context windows of 400K vs 200K, tested across 53 shared challenges. Updated April 2026.
Which is better, GPT-5.1-Codex or Sonar Pro Search?
GPT-5.1-Codex and Sonar Pro Search are both competitive models. GPT-5.1-Codex costs $1.25/M input tokens vs $3/M for Sonar Pro Search. Context windows: 400K vs 200K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-5.1-Codex and Sonar Pro Search
GPT-5.1-Codex is made by openai while Sonar Pro Search is from perplexity. GPT-5.1-Codex has a 400K token context window compared to Sonar Pro Search's 200K. On pricing, GPT-5.1-Codex costs $1.25/M input tokens vs $3/M for Sonar Pro Search.
No community votes yet. On paper, GPT-5.1-Codex has the edge — bigger model tier, bigger context window, major provider backing.
Style Comparison
GPT-5.1-Codex uses 5.8x more transitions
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.
