Mistral announces improved Le Chonk weights; main checkpoint listed as upcoming

Mistral says Mistral Large 4 is live via API in public preview now, with open weights due at the end of October. Reuters says the launch is part of Mistral’s push to narrow the gap with leading Chinese open-weight models.

Mistral says Mistral Large 4 is live via API in public preview now, with open weights due at the end of October. Reuters says the launch is part of Mistral’s push to narrow the gap with leading Chinese open-weight models.

Coding and cybersecurity claims

Mistral reports that Le Chonk leads on Cognition's private FrontierCode 2.0 coding benchmark with a score of 19.7%. The company also reports a 48% score on the Artificial Analysis Coding Agent Index, effectively tied with GLM-5.3 while using 47% fewer tokens per task on average.

For defensive cybersecurity, Mistral reports a 51% score on the Artificial Analysis Cyber Index and says it has worked with vendors to evaluate vulnerability reproduction and patching. It reports an average 96.6% refusal rate on malicious cyber requests, but also says it sees “a potential for uplift to conduct real attacks” and is modifying its guardrails. Mistral says access to a specialized variant for advanced cybersecurity work requires vetting and contractual safeguards.

Mistral says organizations can customize Large 4 with Forge. Its description of the open-weight license permits use, modification, fine-tuning and commercialization, but says businesses offering the model commercially as a service must obtain a separate license.