GPT-5.5 Instant Is Now the Default. Here's What Actually Matters for Developers.
📰 Dev.to · Deeya Jain
OpenAI flipped the default model for ChatGPT on May 5, 2026. GPT-5.5 Instant replaced GPT-5.3. If you...
OpenAI flipped the default model for ChatGPT on May 5, 2026. GPT-5.5 Instant replaced GPT-5.3. If you...