Issue: Claude Code is unusable for complex engineering tasks with Feb updates

2026-04-06 | original

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Why This Matters

The recent regression of Claude Code's performance significantly impacts the reliability of AI-assisted engineering workflows, highlighting challenges in maintaining trust in AI tools for complex tasks. This underscores the importance for the tech industry to ensure AI models remain consistent and dependable, especially in high-stakes environments for consumers and professionals alike.

Key Takeaways

Claude Code's regression affects complex engineering tasks.
Users report consistent failures since February.
Switching providers may be necessary due to reliability issues.

Preflight Checklist

I have searched existing issues for similar behavior reports

I have searched existing issues for similar behavior reports This report does NOT contain sensitive information (API keys, passwords, etc.)

Type of Behavior Issue

Other unexpected behavior

What You Asked Claude to Do

Claude has regressed to the point it cannot be trusted to perform complex engineering.

What Claude Actually Did

Ignores instructions Claims "simplest fixes" that are incorrect Does the opposite of requested activities Claims completion against instructions

Expected Behavior

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Explore topics: claude anthropic api opus engineering tasks model version