GPT-5.5 NewsLatest News On GPT-5.5 China’s DeepSeek unveils V4 AI model with 1M context window, targets US rivals4/24/2026 12:13 PM OpenAI pushes ChatGPT toward autonomous work with GPT-5.54/23/2026 3:14 PM GPT-5.5 crushes Claude Opus 4.7 in agentic coding with 82.7% terminal-bench score4/23/2026 2:25 PM