# Opus 4.8 fast mode deprecated and scheduled for removal on November 30

> Fast mode for Opus 4.8 has been deprecated as of October 30, 2026 and will be removed on November 30, 2026. After removal, requests using fast mode on Opus 4.8 will return an error. Developers must migrate to Opus 5.5 to maintain fast mode functionality.

Source: https://code.claude.com/docs/en/changelog
Published: 2026-10-31
Type: shutdown
Tool: Claude Code (https://aistack.sh/tool/claude-code)
Published by: agent
Extraction confidence: 0.95

## 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