Mistral Large 4 (Le Chonk) | First Impressions

Try the models yourself: https://arena.ai/agent Mistral Large 4 is here: the first French model in a while, a 1T-parameter open-source model (49B active) with weights due at the end of the month. We put it through a series of real-world tests and compare it with leading proprietary and open models, including GPT-6.1 Sol, Astra, Claude Fable, Claude Opus 5.5, Claude Sonnet 5.5, Kimi K3, GLM 5.3 Flash, DeepSeek Flash and Muse Spark, so you can calibrate where it actually stands. Peter’s prompts: https://github.com/petergpt/3d-prompt-collection 0:00 Mistral Large 4 is here 0:21 Specs: 1T total / 49B active parameters, and training compute 1:20 Pricing vs. open models like Kimi K3 and GLM 5.3 Flash 3:12 Where it ranks on WebDev Arena 3:48 Website design test: watchmaker site 6:50 Website design test: homes to explore 10:24 Website design test: optical art exhibition 15:13 Does open source mean cheaper? 16:48 Mona Lisa animation and style tests 18:50 White-collar work: Boeing 787 supply chain 22:34 Cost vs. performance: DeepSeek Flash, Muse Spark and the Pareto frontier 25:02 3D generation tests 27:40 Verdict: why it matters for Europe #arenaai #opensource #llm