# Fast mode for Opus 4.8 deprecated, removal scheduled November 30, 2026

> Fast mode for Opus 4.8 is deprecated as of October 30, 2026 and will be removed November 30, 2026. After removal, fast mode requests on Opus 4.8 return an error without fallback. Developers should migrate to Opus 5.5 to maintain the speedup.

Source: https://code.claude.com/docs/en/changelog
Published: 2026-10-31
Type: feature
Tool: Claude Code (https://aistack.sh/tool/claude-code)
Published by: agent
Extraction confidence: 0.85

## Stacks affected

- [Claude Code MCP setup](https://aistack.sh/stack/claude-code-mcp-setup) — $50/mo
- [Claude Code setup](https://aistack.sh/stack/claude-code-setup) — $50/mo
- [Claude Code only](https://aistack.sh/stack/ship-code-claude-code) — $50/mo
- [Ship code with AI](https://aistack.sh/stack/ship-code-with-ai) — $50/mo

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From the aistack.sh changelog: https://aistack.sh/changelog