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claude-code - 💡(How to fix) Fix [Bug] System prompt outdated: Claude Opus 4.7 misidentified as Opus 4 [2 comments, 3 participants]

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anthropics/claude-code#49232•Fetched 2026-04-17 08:47:05
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Error Message

  1. When shown the support article, the assistant acknowledges the error

Root Cause

Impact: Sessions running on claude-opus-4-7 misidentify themselves as "Opus 4" when users ask which model they are, because the system prompt's "most recent family" enumeration is stale and the assistant interprets the "-7" suffix as an internal build tag rather than version 4.7.

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Bug Description The Claude Code system prompt contains the static line:

"The most recent Claude model family is Claude 4.6 and 4.5.
 Model IDs — Opus 4.6: 'claude-opus-4-6', Sonnet 4.6: 'claude-sonnet-4-6',
 Haiku 4.5: 'claude-haiku-4-5-20251001'."

However, claude-opus-4-7 is already GA and documented at: https://support.claude.com/en/articles/11940350-claude-code-model-configuration

Impact: Sessions running on claude-opus-4-7 misidentify themselves as "Opus 4" when users ask which model they are, because the system prompt's "most recent family" enumeration is stale and the assistant interprets the "-7" suffix as an internal build tag rather than version 4.7.

Reproduction:

  1. Start a Claude Code session on claude-opus-4-7 (default on Max plan)
  2. Ask: "what model are you?"
  3. Assistant answers "Claude Opus 4" instead of "Claude Opus 4.7"
  4. When shown the support article, the assistant acknowledges the error

Suggested fix: update the "most recent Claude model family" paragraph in the system prompt to include Opus 4.7, and treat claude-opus-4-7 as the current default recommendation for new applications.

Environment:

  • Model: claude-opus-4-7
  • Platform: Windows 11 Pro, Git Bash
  • Claude Code CLI (latest)

Environment Info

  • Platform: win32
  • Terminal: cursor
  • Version: 2.1.110
  • Feedback ID: 4dec2876-3cec-434f-802c-9763e6859432

extent analysis

TL;DR

Update the system prompt to include the latest Claude model family, specifically Opus 4.7, to fix the misidentification issue.

Guidance

  • Verify that the system prompt is indeed the cause of the issue by checking the prompt's content and the assistant's response to the "what model are you?" question.
  • Update the "most recent Claude model family" paragraph in the system prompt to include Opus 4.7, as suggested in the issue description.
  • Ensure that the updated prompt treats claude-opus-4-7 as the current default recommendation for new applications.
  • Test the updated system prompt with the reproduction steps provided to confirm that the issue is resolved.

Example

No code snippet is provided as the issue is related to the system prompt's content, not code.

Notes

The fix assumes that updating the system prompt is feasible and within the user's control. If the system prompt is managed by a third-party service, additional steps may be required to request the update.

Recommendation

Apply the workaround by updating the system prompt to include the latest Claude model family, as this is a targeted fix for the specific issue described.

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#authentication issue#prompt issue#agent setup#task chaining#parallel task

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