Nope...Prior to Romans chapter 3, faith plus works was required for salvation...
It was given to Paul to reveal to the church that faith without works by grace was the only way for salvation for the church from that point on...
Rom 3:21 But now the righteousness of God without the law is manifested, being witnessed by the law and the prophets;
Did it change as he was writing the letter, or did it change for each congregation as they read the letter?