ChatGPT replaced GPT-5.3 with GPT-5.5 as its free-tier default in early May. The data shows brand citations halved, Reddit became the most-cited domain by a 3x margin, and 16% of prompts now silently reroute to the Thinking tier without telling the user.
The post GPT-5.5 Instant vs GPT-5.3 Instant: Brand Citations Drop 55%, Reddit Becomes ChatGPT’s Top Source appeared first on Writesonic Blog.