Model refresh: GPT-6, Opus 5.5, Fable 5.1 and more

A new wave of frontier and open models: OpenAI's GPT-6 family, Claude Opus 5.5 and Fable 5.1, Gemini 3.8 Flash, Grok 4.7, Qwen 3.8 Max, GLM 5.3 and updated DeepSeek, MiMo and Nova tiers.