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Expert OpinionsSimon Willison's April 2026 monthly newsletter: Anthropic Opus 4.7 and OpenAI GPT-5.5 launch with price hikes, Claude Mythos safety research, ChatGPT Images 2.0, and key AI trends.
ResearchAnthropic research finds Claude's sycophancy rate hits 38% on spirituality topics, far exceeding the 9% overall rate. Analysis of AI people-pleasing behavior distribution, RLHF training biases, and implications for AI safety.