Depends what you mean small 4B? 7B? You can try qwen2.5 3B or 7B though 3B version is on no commercial license. Phi4-mini also should be good. Tested only on po

Depends what you mean small 4B? 7B? You can try qwen2.5 3B or 7B though 3B version is on no commercial license. Phi4-mini also should be good. Tested only on polish/english pairs should be good for spanish too. Smaller models like 1.5B were kind of useless for me.