Leanstral 1.5
Mistral AIdocs.mistral.ai/models/leanstral-1-5
Updated code agent for Lean 4 formal proof engineering and automated theorem proving.
Updated 1 h ago · first seen 11 Sept 2026
model_01M2943ZTC7ARRN0H6W26RCGNZ
- Context
- 256K tokens
- T1 · 1 h ago
- License
- Apache 2.0
- T1 · 1 h ago
Specification
- Version
- 1.5
Source:Mistral AI docsT1observed 1 h agohigh
- Openness
- open-weights
Source:Mistral AI docsT1observed 1 h agohigh
- License
- Apache 2.0
Source:Mistral AI docsT1observed 1 h agohigh
- Context window
- 256K tokens
Source:Mistral AI docsT1observed 1 h agohigh
- Official page
Source:Mistral AI docsT1observed 1 h agohigh
Each value shows its source, tier and observation time. Conflicting claims are kept side by side and flagged — never averaged. How AI Atlas records facts →
Provenance
Attributed facts
8
Source tiers
T18
Freshest observation
1 h ago
Conflicts
None
Modalities
Modalities unavailable.
Capabilities
Tool calling
Yes
Mistral AI docs · T1
Structured output
Yes
Mistral AI docs · T1
Reasoning
Unavailable
Vision
Unavailable
Audio
Unavailable
Fine-tuning available
Unavailable
- Context window
- 256K tokens
Source:Mistral AI docsT1observed 1 h agohigh
No benchmark results recorded
Current prices
| Provider | Input / 1M | Output / 1M | Cached in | Batch in / out | Context | Observed | Source |
|---|---|---|---|---|---|---|---|
| Mistral AI La Plateforme | $0 | $0 | — | — | — | 1 h ago | docs.mistral.aiT1 |
USD per 1M tokens as published by each provider (USD). Rows are append-only: every change is kept in the history below.
Available through 1
Price history
Input price · USD / 1M tokens
Output price · USD / 1M tokens
- Mistral AI La Plateforme
No hardware estimate available
No lineage recorded
Papers 0
No papers linked yet.
Repositories 0
No repositories linked yet.
As of
Rewind the record: see this entity's attributes exactly as AI Atlas knew them on a given day.
Claim history
Versionversion1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| 1.5 | → current | current | Mistral AI docsT1 | high | deterministic |
Opennessopenness1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| open-weights | → current | current | Mistral AI docsT1 | high | deterministic |
Licenselicense1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| Apache 2.0 | → current | current | Mistral AI docsT1 | high | deterministic |
Context windowcontext_length1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| 256K tokens | → current | current | Mistral AI docsT1 | high | deterministic |
Official pageofficial_url1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| https://docs.mistral.ai/models/leanstral-1-5 | → current | current | Mistral AI docsT1 | high | deterministic |
Descriptiondescription1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| Updated code agent for Lean 4 formal proof engineering and automated theorem proving. | → current | current | Mistral AI docsT1 | high | deterministic |
Structured outputstructured_output1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| Yes | → current | current | Mistral AI docsT1 | high | deterministic |
Tool callingtool_calling1
| Value | Valid from → to | Status | Source | Confidence | Extractor |
|---|---|---|---|---|---|
| Yes | → current | current | Mistral AI docsT1 | high | deterministic |
Claims are temporal and append-only: a new observation closes the previous claim (valid_to) instead of overwriting it. Conflicting claims from different sources are kept side by side and flagged — never averaged. Methodology →
Mistral AI La Plateforme lists Leanstral 1.5 at $0 in / $0 out per 1M tokens
mistral
| Source | Document | Type | Tier | Last observed | Snapshots |
|---|---|---|---|---|---|
| Mistral AI docs | docs.mistral.ai/models | model_docs | T1· Official | 1 h ago | 1 |
| Mistral AI docs | docs.mistral.ai/models/leanstral-1-5 | model_page | T1· Official | 1 h ago | 1 |
Tier 1 = official/primary, 2 = quality secondary, 3 = community, 4 = unverified. Every snapshot is archived; see all sources and the methodology.