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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.97 8 Apr 2026

Subagent Model Downgrade: Opus to Sonnet [In Development]

What

When enabled, this feature automatically downgrades Opus model usage for sub-agents to Sonnet, potentially reducing costs for agentic workflows.

Status

Feature-flagged (disabled by default)

Details

Gated behind tengu_garnet_loom flag with default !1 (false)
When active and the current model includes "opus", it substitutes a Sonnet model
Likely intended to balance cost vs. capability for Task sub-agents

Evidence

Flag check R8("tengu_garnet_loom", !1) that downgrades opus to sonnet (search for "tengu_garnet_loom")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.97 →