The most immediate change in the new models is the introduction of adaptive reasoning. GPT-5.1 Instant, now the primary model for most ChatGPT users, evaluates the ...

This book offers a hands-on guide to building GPTs that learn, adapt, and respond in your unique style. Get it for free ...

Each ChatGPT plan offers different benefits for different users. Paid tiers get early access and fewer usage limits. You may not need to pay, depending on how often you use ChatGPT. OpenAI introduced ...