The reconciliation of such measures to the most comparable GAAP figures is included in our earnings release, financial supplement, and earnings presentation, all of which are available on our website at aig.com. Please refer to page 27 of the earnings presentation for reconciliations of such metrics reported on a comparable basis. We achieved tremendous EPS and ROE results as we continued to execute on our strategy to deliver sustainable, profitable growth. The key takeaway is that they are all expected to be earnings, EPS, and ROE accretive in the first year post-closing.
This was made possible due to our strong balance sheet, prudent capital management, and financial flexibility. In the third quarter, we delivered adjusted after-tax income per diluted share of $2.20, which is an increase of 77% year-over-year. Adjusted after-tax income for the quarter is $1.2 billion, an increase of 52% year-over-year, driven by our general insurance business. Net investment income on an adjusted pre-tax basis was $1 billion, an increase of 15% year-over-year.
The calendar year combined ratio was 86.8%, an improvement of 580 basis points from the prior year quarter. It's worth noting, which we mentioned on our third quarter 2024 earnings call, that we had a closeout transaction in our casualty portfolio that benefited overall growth in the prior year quarter. This growth was driven in targeted areas, notably programs, which increased 27%. These will strengthen AIG's long-term value and strategic positioning, and we expect they will be earnings, EPS, and ROE accretive one year after closing, aligned with the objectives we outlined at Investor Day.