Unverified50% confidenceFactExact time
Anthropic has implemented an anti-injection process for the Claude Fable 5.1 API, requiring that when resuming old inference records the original chat history, system prompt, and tool configuration must remain unchanged, otherwise the request is rejected.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
9/11/2026
First Seen
Valid until: 12/10/2026
Sources
Related Entities
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