Mistral launches Large 4, scoring 82% on real vulnerability patching

Top News · 1,668 HN points

Mistral Large 4 is the company's largest and most capable model to date. It is a natively multimodal, open-weight MoE with 1 trillion total and 49 billion active parameters. On the Artificial Analysis Cyber Index, it ranks among the global top five.

Here's what changed:

• It scores 82% on a test that reproduces and patches a real vulnerability, the highest score reported, plus 93% on Cybench.
• On AutomationBench (657 workflows across Gmail, Sheets, Slack and Salesforce) it hits 59.9%, ahead of Kimi K3 and DeepSeek V4 Pro.
• For coding it reaches 61.7% on DeepSWE v1.1 and 49.8% on the Coding Agent Index.
• It resists 93.3% of prompt-injection attacks on Lakera's B3 benchmark.
• API prices are $1.36 per million input tokens and $4.18 per million output tokens.

One catch: this is a preview with the RL run still in progress, and Mistral says weights are due by the end of October 2026.

Try it: the public preview API on Mistral Studio. Also available via Vercel

Sources: mistral.ai · mistral.ai