Claude Opus 4.8 vs Mistral Large 3

Choose Claude Opus 4.8 if you want hard, high-stakes coding and reasoning where quality matters more than cost. Choose Mistral Large 3 if you want general-purpose open-weight agent work, especially in the EU.

In our editorial scoring, Claude Opus 4.8 leads in 3 of five dimensions (output quality, agentic ability and reliability), while Mistral Large 3 leads in 2. On price, Claude Opus 4.8 runs about $11 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.