AI Model Daily - 2026-06-28

2026-06-28 AI model news: OpenAI previews GPT-5.6 Sol, Terra, and Luna; Anthropic restores limited Mythos 5 access; HappyHorse 1.1 enters video arenas; MAI-Code-1-Flash reaches Copilot GA; Runway, Sakana, and Wan Streamer signals move.