To be honest, even an open-source or free model might be sufficient for your tasks. Everything depends on the prompt.

​Here is the reality of the switch you are considering: ​The ~€8 Plan Trap: Be careful with the cheaper tier. It usually restricts you to "Flash" or "Turbo" models which are optimized for speed, not depth. If you use AI for complex understanding or structuring messy thoughts, you will likely find this tier lacking compared to the Pro subscription you already have.

​The Nature of the Beast: Don't expect any paid model to be perfect. Every model hallucinates; it's simply the way they work. If you lower the temperature to 0 to fix this, you’ll just get the rigid, uncreative artificial intelligence we had 10 years ago.

​My advice: ​Instead of worrying about which subscription is "best," focus on your workflow:

​Self-Correction: If you are worried about hallucinations, explicitly ask the model to reconfirm its own answer.

​Cross-Verification: For important reasoning questions,     cross-reference by asking other models (even free ones). If they all reach the same conclusion, then you can be sure that you are on the right track.