2 Timothy 1:10 says Jesus abolished death and revealed life and immortality through the gospel. Paul wrote this in the present tense, showing that Christ's work had already begun to undo death's power.

In 1 Corinthians 15:26, Paul says, "The last enemy that will be abolished is death." This points to the final completion of that process. The gospel began the abolition, and the judgment in AD 70 finished it by ending the Old Covenant system that brought condemnation and death (2 Corinthians 3:7-11).

So, the two verses are not in conflict. Instead, they show a progressive but completed victory:

2 Timothy 1:10 – The work had already begun and was revealed in Christ.

1 Corinthians 15:26 – Death would be fully abolished by the end of the Old Covenant age, which happened in 70 AD.

That's when the last enemy, covenantal death, was destroyed, and full access to life in Christ was revealed.