Mistral
Open weights
Leanstral 1.5
An updated Lean 4 formal proof engineering model optimised for automated theorem proving and autoformalization. 119B total parameters, 6.5B active.
Intelligence
—
AA Index
Output price
$0/1M
In $0/1M
Context
262k
tokens
Speed
—
tokens/sec
Performance
Benchmark data for this model isn't available yet.
Specifications
Provider
Mistral
Family
leanstral
Released
2026-06-30
Context window
262,144 tokens
Max output
128,000 tokens
Input price
$0/1M
Output price
$0/1M
Input modalities
text
image
Output modalities
text
Capabilities
Reasoning · Tool calling · Structured output · File attachments · Open weights
Specs from models.dev · benchmarks from Artificial Analysis.
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