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A Lean 4 model that finds real bugs in Rust code and costs pennies per proof—formal verification just became a commodity.

Executive Summary: Mistral AI's open-source Leanstral 1.5 solves 587 PutnamBench problems at $4 each, undercutting rivals by 75x and democratizing formal verification.

Topic Breakdown:

Intro: The core shift
Analysis: Strategic consequences
Bottom Line: Impact for executives

Strategic Impact: Leanstral 1.5 collapses the cost of formal verification by 75x, making it accessible to any development team. Organizations that adopt it now gain a competitive advantage in software reliability, while those that wait risk falling behind as correctness becomes a commodity.

Decoding the signal for leaders. For the full strategic analysis, visit Signal Daily News.

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