Leanstral Models by MistralAI
MistralAIApache 2.0
1 model2026
About
Mistral's Leanstral family of specialized open-source models focused on formal mathematics, proof engineering, and Lean 4 theorem proving using highly sparse MoE architectures.
Specifications(1 models)
| Model | Released | Parameters | Fn Calling | Tool Use |
|---|---|---|---|---|
| Leanstral 120B | 2026-03 | 120B (6B active) | Yes | Yes |
Frequently Asked Questions
- What is Leanstral used for?
- Leanstral is used for math, agent workflows and tool use, and coding. The family description and listed model capabilities point to those workloads as the best fit.
- How does Leanstral compare to Ministral?
- Leanstral by MistralAI is strongest where you need math, while Ministral by MistralAI is the closest related family to check for structured outputs. Leanstral has 1 listed variant, while Ministral reaches up to 32K context, so compare the specs and pricing tables before choosing a production model.
- Which Leanstral model should I use?
- If price is the main constraint, use the pricing table first because Leanstral does not have complete provider pricing in the local data. For the most capable/latest local choice, evaluate Leanstral 120B with tool use and function calling.
