GPT-5.4 vs Mistral Large 3

Choose GPT-5.4 if you want the OpenAI daily driver — strong and well-priced. Choose Mistral Large 3 if you want general-purpose open-weight agent work, especially in the EU.

Editorially it's close: each model leads in 2 of our five dimensions. On price, GPT-5.4 runs about $6.25 per 1M tokens (blended) and is proprietary; Mistral Large 3 is about $0.80 and open-weight.

The model is half the story — the agent is the other half

The model picks the moves; the agent runs the loop, the tools, and the guardrails. Once you've chosen a model, see which agent gets the most out of it.