Leanstral 1.5: Mistral's Open-Source Bet on Formal Verification Agents
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Leanstral 1.5: Mistral's Open-Source Bet on Formal Verification Agents I spent the morning pulling down Mistral's new Leanstral 1.5 — a 119B-parameter MoE model with 6.5B active parameters, purpose-built for Lean 4 theorem proving. It's Apache 2.0 licensed, runs on vLLM, and it's the first model I've seen that treats formal verification as a first-class agent use case rather than an afterthought. Here's what I found. What It Actually Is Leanstral 1.5 is a code agent model fine-tuned from…
1Key Takeaways
- Leanstral 1.5: Mistral's Open-Source Bet on Formal Verification Agents I spent the morning pulling down Mistral's new Leanstral 1.5 — a 119B-parameter MoE model with 6.5B active parameters, purpose-built for Lean 4 theorem proving.
- It's Apache 2.0 licensed, runs on vLLM, and it's the first model I've seen that treats formal verification as a first-class agent use case rather than an afterthought.
- What It Actually Is Leanstral 1.5 is a code agent model fine-tuned from….
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3Why it matters
Coding AI shifts how fast software ships and how much human review each change needs. DEV — ML reports that leanstral 1.5: Mistral's Open-Source Bet on Formal Verification Agents I spent the morning pulling down Mistral's new Leanstral 1.5 — a 119B-parameter MoE model with 6.5B active parameters, purpose-built for Lean 4 theorem proving.
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