When the rise is justified by AI features.
Increasingly common, and worth thinking about separately, because it is a different question from a plain increase.
An AI feature built into a platform was built for every customer that platform has, which means it answers a question the vendor decided was common. Whether that question is the one costing you time is a coincidence. Sometimes it genuinely is. Often it is a summarising or drafting feature that produces work to check rather than work removed.
Three questions settle it quickly. What job does it do, stated as a sentence about your week rather than as a capability. What does it get wrong, and who finds out. And what happens if you turn it off, because a feature you can switch off costs nothing to try, while one your renewal price now depends on is a decision rather than a trial.
If the honest answer is that the feature does nothing for your business, that does not automatically mean leave. It means the increase should be judged as a straight price rise with no added value, which is what the four options above are for.
More on telling the two kinds of AI apart