Create custom subagents changedsub-agents
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Upstream edited this page at 8 Oct 2026 02:10 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 8 Oct 2026 03:07 UTC.
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3593593. The [`CLAUDE_CODE_SUBAGENT_MODEL`](/docs/en/model-config#environment-variables) environment variable, when you set it to a model alias or model ID
3603604. The main conversation's model
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362If an installed [mod](/docs/en/plugins/mods/overview) sets a model in its [`agent.spawn`](/docs/en/plugins/mods/reference#subagents) hook, Claude Code uses that model in place of the per-invocation parameter.
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362364In two cases, a family alias such as `opus` in the per-invocation parameter or the frontmatter resolves to the main conversation's model instead of the [version the alias points to](/docs/en/model-config#model-aliases):
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364366* **The main conversation's model belongs to that family**: the subagent runs on the main conversation's exact model, including any `[1m]` suffix, so it gets the same [extended context](/docs/en/model-config#extended-context) window as the main conversation.
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