# Anthropic resumes charging for safeguard-blocked requests in three categories

The policy applies to blocks in biology, distillation attacks, and frontier LLM development to counter coordinated system attacks.

- Classifiers for these billable blocks are tuned to a false positive rate under 0.1%.
- In recent testing across Claude Code, Claude.ai, and Cowork, 99.7% of accounts did not encounter billable blocks.
- Developers can flag incorrect blocks using the /feedback command in Claude Code.

## Why it matters

Users running requests flagged for biology, distillation, or frontier LLM development will now incur costs even when requests are blocked before generation.

## Sources

- [Anthropic: Anthropic resumes charging for safeguard-blocked requests in three categories](https://x.com/ClaudeDevs/status/2103170368794185758)

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Summarized by dstilled on 2026-09-24. https://dstilled.ai/story/c25fa371-565c-490b-8e60-1f37369d42c3