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claude-code - 💡(How to fix) Fix Advisor tool: Haiku 4.5 executor rejected by CLI despite API docs listing it as valid pair [2 comments, 3 participants]

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anthropics/claude-code#46148•Fetched 2026-04-11 06:27:48
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Error Message

  1. See error: "The current main model (Haiku 4.5) does not support the advisor."
RAW_BUFFERClick to expand / collapse

Bug Description

The /advisor command in Claude Code CLI shows "The current main model (Haiku 4.5) does not support the advisor" when using Haiku 4.5 as the main model. However, the official API documentation explicitly lists Claude Haiku 4.5 + Claude Opus 4.6 as a valid executor/advisor pair.

Steps to Reproduce

  1. Open Claude Code CLI
  2. Switch model to Haiku 4.5 (/model → select Haiku 4.5)
  3. Run /advisor
  4. See error: "The current main model (Haiku 4.5) does not support the advisor."

Expected Behavior

Based on the API docs' model compatibility table:

Executor ModelAdvisor Model
Claude Haiku 4.5 (claude-haiku-4-5-20251001)Claude Opus 4.6 (claude-opus-4-6) ✓
Claude Sonnet 4.6 (claude-sonnet-4-6)Claude Opus 4.6 (claude-opus-4-6)
Claude Opus 4.6 (claude-opus-4-6)Claude Opus 4.6 (claude-opus-4-6)

Haiku 4.5 should be able to select Opus 4.6 as advisor.

Actual Behavior

CLI rejects the pairing entirely with a red warning message: "The current main model (Haiku 4.5) does not support the advisor."

Only options shown are:

  1. Opus 4.6 ✓ (selected)
  2. Sonnet 4.6
  3. No advisor

Environment

  • Claude Code version: Latest (as of 2026-04-10)
  • OS: Windows 11 Pro 10.0.26200
  • Shell: bash
  • Platform: win32

Notes

This appears to be a validation discrepancy between the Claude Code CLI and the API-level advisor tool support. The API (with advisor-tool-2026-03-01 beta header) supports the Haiku + Opus pair, but the CLI's internal validation doesn't allow it.

extent analysis

TL;DR

The issue may be resolved by updating the internal validation in the Claude Code CLI to match the API-level advisor tool support, allowing the Haiku 4.5 and Opus 4.6 pairing.

Guidance

  • Review the API documentation and the Claude Code CLI's internal validation to identify the discrepancy and ensure that the CLI's validation is updated to reflect the supported model pairs.
  • Verify that the advisor-tool-2026-03-01 beta header is being used in the API requests to ensure that the latest advisor tool support is being utilized.
  • Check the Claude Code CLI's configuration and settings to see if there are any overrides or customizations that may be causing the validation discrepancy.
  • Consider reaching out to the developers or support team for the Claude Code CLI to report the issue and request an update to the internal validation.

Example

No code snippet is provided as the issue appears to be related to the internal validation of the Claude Code CLI and not a specific code implementation.

Notes

The issue may be specific to the version of the Claude Code CLI being used, and updating to a newer version may resolve the issue. Additionally, the use of the advisor-tool-2026-03-01 beta header may be required to access the latest advisor tool support.

Recommendation

Apply workaround: The best course of action would be to reach out to the developers or support team for the Claude Code CLI to report the issue and request an update to the internal validation, as updating the validation would provide a more permanent solution than a workaround.

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claude-code - 💡(How to fix) Fix Advisor tool: Haiku 4.5 executor rejected by CLI despite API docs listing it as valid pair [2 comments, 3 participants]