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Update (16 April 2026)

Since the book was published, OpenAI has updated the structure of their subscription plans. They have introduced advertisements into the free plan and added a new “Go” plan at $8/month, also with advertisements, but with higher rate limits than the free plan, but less than $20/month Plus plan which does not have advertising.

Their previous Pro plan, which was $200/month, now comes into two flavors, one at $100/month and one at $200/month. Both give access to the GPT-5.4-Pro model. I think this is more targeted to those using ChatGPT for hard math and science problems, as well as professional programmers. I don’t think the average genealogist would receive a benefit that would justify that expense.

My recommendation remains that the $20/month Plus plan is the best for genealogists who anticipate using ChatGPT on a daily basis, including for non-genealogical tasks. But those just starting off can get a good taste of the product using the Free plan, and now have an additional option with the $8/month Go plan.

A full list of the plans can be found on the OpenAI website here.