OpenAI shipped GPT-6 Astra, its most expensive model ever and the first it calls "AGI era." It saturates frontier math and reasoning benchmarks, at a price to match.
OpenAI makes GPT-5.5 the default in ChatGPT with more natural answers and fewer hallucinations, while older GPT-5.2 and GPT-4.5 models are retired.
Anthropic
Moonshot