Best Input Price
$0.00 / 1M
Leanstral 1.5 is an updated Lean 4 formal proof engineering model from Mistral AI, optimized for automated theorem proving and autoformalization. It has 119B total parameters with 6.5B active and supports a 256K token context window. It supports native function calling and structured output.
Context Window
262,144 tokens
Reasoning
No
Tool Calling
Supported
Released
2026-05-27