Claude mobile web bug: replies truncated when model writes antThinking tag
Kyrannio · x · 2026-11-15
User Kyrannio reported a Claude mobile web rendering bug (screenshot shows Fable 5.2 Medium): whenever a reply contains the literal old artifacts control tag (angle brackets around "antThinking"), display cuts off at that point, hiding the rest of the reply and sources. Reproduce by asking about the leaked 2024 Claude 3.5 Sonnet artifacts system prompt and its hidden thinking tags — even inside inline backticks the reply truncates. Reported to Anthropic.
Related event: Claude mobile web UI silently strips antThinking tag content(5 posts)→
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