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leanstral-1-5

Canonical ID: requesty/leanstral-1-5

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.

Reasoning: Yes Tool use: Yes

Overview

text
Provider
Requesty logo Requesty
Family
leanstral
Release date
2026-05-27
Last updated
2026-05-27
Input modalities
text
Output modalities
text

Pricing and Limits

Token pricing

Input
$0/1M
Output
$0/1M
Cached input
N/A
Currency: USD

Context and output

Context window
262,144
Max output tokens
32,768
Qualified ID
requesty/leanstral-1-5

Model Summary

leanstral-1-5 is a model listing in the Requesty provider catalog. It is categorized under the leanstral family.

The model supports text modalities across input/output paths. Reported context capacity is 262,144. Pricing is listed at $0/1M input and $0/1M output.

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Model Provider Context Input Output Flags
Leanstral 1.5
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262,144 $0/1M $0/1M
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leanstral-1-5@eu
requesty/leanstral-1-5@eu
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262,144 $0/1M $0/1M
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