Anthropic Customer Checks Report Significant Coding Efficiency Improvements From Fable

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Anthropic Customer Checks Report Significant Coding Efficiency Improvements From Fable

Equity Research

Industry Update — June 26, 2026

U.S. Software

Anthropic Customer Checks Report

Significant Coding Efficiency Improvements

From Fable

Our Call Ryan MacWilliams, CFA

We spoke with 2 engineering leaders at AI startups who briefly tested Fable 5 and Equity Analyst | Wells Fargo Securities, LLC

Ryan.MacWilliams@wellsfargo.com | 212-214-1192

reported a step function improvement in AI performance capability. Both noted the

Michael Turrin, CFAhigher ROI was well worth the higher token cost, which can easily surpass $100/hour.

Equity Analyst | Wells Fargo Securities, LLC

Michael.Turrin@wellsfargo.com | 628-629-7565

Fable 5 is much better at completing higher ROI, long-running tasks on its first Ken Gawrelski

try, that previously required multiple turns of human + AI review. Checks report more Equity Analyst | Wells Fargo Securities, LLC

instances of Fable working autonomously (like a reliable coworker), while prior models Ken.Gawrelski@wellsfargo.com | 617-210-3707

needed more direct supervision. Zeeshan Rauf

Associate Equity Analyst | Wells Fargo Securities, LLC

• More human-like performance comes at a more human-like cost, and Fable-like Zeeshan.Rauf@wellsfargo.com | 212-214-1120

models could reshape conversation around which models are deployed where, for Chris Brazeau

what use case, and token spend estimates. Associate Equity Analyst | Wells Fargo Securities, LLC

Chris.Brazeau@wellsfargo.com | 929-767-5658

Figure 1 - Fable 5's performance on Agent Arena shows strong improvements vs. other Cyrus Motakef

leading AI models Associate Equity Analyst | Wells Fargo Securities, LLC Cyrus.Motakef@wellsfargo.com | 212-214-3334