GPT-5.4 and Perplexity Sonar Pro for real workflows
GPT-5.4 is provided by OpenAI and emphasizes extended context and superior reasoning. Perplexity Sonar Pro, from Perplexity AI, emphasizes web-grounded answers and fast search. The stronger option depends on the input, output constraints, and review standard.
How to test GPT-5.4 vs Perplexity Sonar Pro
Run the same prompt, source context, output format, and acceptance criteria through both models. Score accuracy, instruction following, edit time, latency, and current cost separately. Repeat the test on several representative tasks before standardizing on either model.