Leanstral 1.5
by Mistral AIChat
An updated Lean 4 formal proof engineering model optimised for automated theorem proving and autoformalization. 119B total parameters, 6.5B active.
- Context
- 262K tokens
- Max output
- 128,000 tokens
- Released
- 2026-06-30
- Weights
- Open
mistral/labs-leanstral-1-5-1
Specifications
Full facts as recorded, incl. what is unknown.
- Released
- 2026-06-30
- Weights
- Open
- Input
- Text, Image
- Output
- Text
- Context window
- 262,144 max across endpoints
- Max output
- 128,000
- Providers
- 1
- Epoch Capabilities Index
- not evaluated
- Direct price range
- no comparable direct price
More details
- Last updated
- 2026-06-30
- Knowledge cutoff
Capabilities
Across all endpoints: supported if any endpoint supports it.
- Tool calling
- Parallel toolsunknown
- Structured output
- Reasoning
- Image input
- PDF input
- Audio input
- Audio outputunknown
- Video input
- Prompt cachingunknown
- Web searchunknown
- Computer useunknown
- System messagesunknown
- Assistant prefillunknown
- Temperature
- Streamingunknown
- Attachments
Endpoints
One row per provider and variant; gateways are listed separately.
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Cost calculator
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Heads up: prices are indicative list rates scraped from provider pricing pages; verify with the provider before relying on them. Report incorrect data for this model