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leanstral 1.5@eu

Tool CallingStructured Output

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.

Providers1
ReleasedMay 27, 2026
Input Modalitiestext
Output Modalitiestext
Tarsk Usecoding

Available Providers (1)

ProviderModel IDInput CostOutput CostContextMax OutputDocs
Requestyleanstral-1-5@eu$0/MTok$0/MTok262.1K32.8K

Capabilities

Reasoning
Tool Calling
Attachments
Open Weights
Structured Output