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Anthropic sunsets Claude Opus 4.8 fast mode, adds subagent control

By PulseAugur Editorial · [1 sources] ·

Anthropic has released Claude Code 2.1.316, introducing a new environment variable for controlling subagent effort and marking the deprecation of Opus 4.8's fast mode. The update also includes infrastructure improvements like pooled group budgets and layered policy modes for gateways, though these are primarily for enterprise users. The deprecation of Opus 4.8's fast mode, with Opus 5.5 as its replacement, is set to be fully removed by November 30, 2026, prompting users to transition their workflows. AI

IMPACT Users of Claude Code should update their workflows to accommodate the deprecation of Opus 4.8's fast mode and leverage the new subagent effort controls.

RANK_REASON This is a minor version update to a specific tool (Claude Code) with feature additions and deprecations, not a core model release.

Read on dev.to — Claude Code tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Anthropic sunsets Claude Opus 4.8 fast mode, adds subagent control

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This is a minor version update to a specific tool (Claude Code) with feature additions and deprecations, not a core model release.
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COVERAGE [1]

  1. dev.to — Claude Code tag TIER_1 (CA) · RAXXO Studios ·

    Claude Code 2.1.316 Adds a Subagent Effort Dial, Sunsets Fast Mode

    <ul> <li><p>Claude Code 2.1.316 landed October 31 with new environment variables for ultrathink and subagent effort control.</p></li> <li><p>Opus 4.8 fast mode is deprecated today and removed November 30, 2026, with Opus 5.5 as the replacement.</p></li> <li><p>The release ships 5…

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