Microsoft limits employee use of Claude Fable 5 over data retention concerns
… Though a temporary ban is in place, internal demand could force Microsoft to change its tune. Mythos 5 and Fable 5 outperform key frontier models like GPT-5.5, Gemini 3.1 Pro and Opus 4.8 across 13 testing categories, including agentic coding, knowledge work and cybersecurity. …