Leanstral 1.5 introduces an updated Lean 4 formal proof engineering model with optimizations for automated theorem proving and autoformalization. This version features a total of 119 billion parameters, with 6.5 billion active parameters, offering improvements in speed and performance.
Leanstral 1.5 was released on June 30, 2026, featuring enhancements to Lean 4, specifically targeting automated theorem proving and autoformalization.
The new version includes optimizations that are expected to improve the speed and performance of theorem proving tasks. With 119 billion total parameters and 6.5 billion active parameters, Leanstral 1.5 aims to deliver more efficient computation.
Leanstral 1.5 is made available at no cost, providing an accessible tool for users in the formal verification and proof development community. Its advancements are particularly relevant for researchers and developers aiming to leverage machine-based theorem proving.
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Leanstral 1.5 introduces an updated Lean 4 formal proof engineering model with optimizations for automated theorem proving and autoformalization. This version features a total of 119 billion parameters, with 6.5 billion active parameters, offering improvements in speed and performance.