# Claude Opus 5.5 users report cutoffs on reverse-engineering prompts

Digest AI · Generative AI & Models · published 2026-10-24T12:29:00Z

Canonical: https://digestai.news/story/claude-opus-5-5-users-report-cutoffs-on-reverse-engineering-prompts

## Summary

Users on Reddit and X say Anthropic's Claude Opus 5.5 now stops mid-response when asked to reverse-engineer software, a capability linked to recent AI-assisted game decompilations. The reports began on 21 October on r/Claude, and Kotaku notes Anthropic has not announced a new Opus 5.5 version. Some users describe a safety guardrail triggering mid-sentence, while others argue the model was always inconsistent on such requests. Kotaku ties the decompilation wave to Opus 5.5's 22 September release and notes publishers are issuing DMCA takedowns, including one from Mega Crit over Slay the Spire II source code on 7 October. Anthropic's launch post says Opus 5.5 deploys with safeguards similar to those on Claude Fable 5.1 and plans to expand its Cyber Verification Program for verified security practitioners. The company has not commented on the user reports.

## Key points

- Users say Opus 5.5 cuts off reverse-engineering prompts mid-response since 21 October
- Kotaku reports Anthropic has not announced a new Opus 5.5 version
- Publishers are sending DMCA takedowns over AI-assisted game decompilations

## Why it matters

If confirmed, a quiet guardrail change would affect security researchers and developers who rely on Opus 5.5 for binary analysis, while publishers pursue legal action against AI-assisted decompilation projects.

## Sources

1. [Claude Opus 5.5 users say reverse-engineering prompts now get cut off](https://tbreak.com/claude-opus-5-5-reverse-engineering-restricted) (tbreak.com, 2026-10-24)

Part of the developing story: [Claude Opus 5.5 Reasoning Restrictions](https://digestai.news/thread/anthropic-claude-opus-5-5-rejects-disabled-thinking-causing-400-errors) (2 stories)

## Cite

Digest AI, "Claude Opus 5.5 users report cutoffs on reverse-engineering prompts", 24 October 2026, https://digestai.news/story/claude-opus-5-5-users-report-cutoffs-on-reverse-engineering-prompts

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