Users criticized OpenAI’s ChatGPT-5 model for restrictive rate limits and inability to switch to previous AI models, threatening to switch to competitors. CEO Sam Altman responded by doubling GPT-5 rate limits for ChatGPT Plus users and allowing them to continue using the previous model. Altman touted GPT-5 as a significant upgrade over GPT-4 on the path to artificial general intelligence (AGI).

DeepSeek released Prover V2, an open-weighted large-language model designed for mathematics in April. Open-weighted models provide transparency by allowing anyone to download and use the software while keeping training data private. DeepSeek also upgraded R1 to R1-0528 in May, with benchmarks showing it competing with top AI models like OpenAI-o3. The DeepSeek app has been downloaded over 75 million times since January.

Read more at Cointelegraph: ChatGPT-5 Upgrade Faces User Backlash as AI Rivals Gain Ground