AI Drift Log: Claude Financial Data Accuracy — March 2026
Claude 3.5 Sonnet showed improved accuracy for company financial data in March 2026, but introduced new errors in startup funding rounds. Revenue estimates for public companies improved while private company data degraded.
Accuracy changes
- Public company revenue estimates: accuracy improved from 72% to 81%.
- Private company funding data: accuracy decreased from 65% to 54%.
- Startup valuations: 3 out of 10 tracked startups had >50% valuation errors.
- Claude now correctly refuses to estimate when data is uncertain (good behavior).
Analysis
- Improvement in public company data likely from Anthropic's web search integration.
- Private company data regression suggests changes in training data weighting.
- Recommendation: private companies should proactively publish financial milestones.
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