# Mistral Large 4 (Le Chonk) now open weight

> Mistral releases open-weight 1-trillion-parameter model for coding and cybersecurity.
- Title: Mistral Large 4 (Le Chonk) now open weight · Mistral
- Summary: Mistral releases open-weight 1-trillion-parameter model for coding and cybersecurity. Mistral Large 4 (Le Chon: 1 trillion parameters) now open for…
- Keywords: mistral large 4, le chonk, open weight, coding, cybersecurity, sovereign ai, multimodal, reasoning, reinforcement learning, token efficiency, artificial analysis coding agent index, terminal bench
- Source: Mistral — https://mistral.ai/news/mistral-large-4-oss
- Read time: 2 min
- Topics: mistral large 4, le chonk, open weight, coding, cybersecurity, sovereign ai, multimodal, reasoning, reinforcement learning, token efficiency, artificial analysis coding agent index, terminal bench
## Mistral Large 4 (Le Chonk) released
Mistral released Mistral Large 4 (Le Chonk), a 1-trillion-parameter multimodal model now available with improved coding, cybersecurity, and reasoning efficiency.
## Public preview success
The model entered public preview with strong results across coding benchmarks and has improved significantly in three weeks.
## Coding benchmark leads
On Cognition's FrontierCode 2.0 benchmark, Mistral Large 4 leads with 19.7% score for code quality and mergeability.
## Token efficiency gains
Mistral Large 4 scores 48% on the Artificial Analysis Coding Agent Index while using 47% fewer tokens per task than leading open models.
## Terminal benchmark improvement
On Terminal-Bench 4.0, Mistral Large 4 improved by 13 percentage points to 41% while reducing output tokens by 30%.
## Three reasoning modes
Mistral Large 4 supports low, medium, and high reasoning modes for cost-performance balance in coding workflows.
## Human preference wins
In Surge Code's blind evaluations, Mistral Large 4 was preferred over GLM-5.3, Kimi K3, and DeepSeek V4.1 Flash.
## Cybersecurity capabilities
Mistral Large 4 scores 51% on the Artificial Analysis Cyber Index for vulnerability reproduction and patching without breaking functionality.
## Refusal rates improve
Mistral Large 4 achieves 96.6% refusal rate on malicious cyber requests, the highest among open models.
## Cybersecurity quotes
Booz Allen, Cisco, Cloudflare, CrowdStrike, Elastic, ENISA, Fortinet, NVIDIA, Orange Cyberdefense, and Rubrik all praise Mistral Large 4's cybersecurity capabilities.
## Financial benchmark gains
Mistral Large 4 improved to 73.3% on Finch scores for finance-related workflows, second only to Kimi K3 among open models.
## Web browsing performance
Mistral Large 4 reaches 84.5% on BrowseComp, starting from 75% in the SFT checkpoint.
## Agent security benchmark
Mistral Large 4 resists 97.1% of attacks on the B3 Agent Security Benchmark, top of the OSS frontier.
## Sovereign AI benefits
Mistral Large 4 gives organizations control to inspect, customize, and deploy on their own infrastructure with European training.
## Enterprise adoption
La Banque Postale, ABN AMRO, Belfius, Crédit Agricole, ESA, Hugging Face, ZML, and Microsoft are adopting Mistral Large 4 for sovereign AI.
## Deployment options
Mistral Large 4 is available through Mistral Studio, API, OpenRouter, Hugging Face, NVIDIA, and Microsoft Foundry.
## Key takeaway

Mistral Large 4 (Le Chon: 1 trillion parameters) now open for developers with improved coding and cybersecurity capabilities.