Also Classic Thor is galaxy+ level. Mjolnir absorbed the power to destroy a galaxy once but Thor channeled his personal god blasts energies into it and it couldn't contain it and shattered. Said God Beam has even frightened Galactus away. Classic Thor also shielded a life bomb that can destroy 20% of the Universe. So yes Classic Thor is above Galaxy level. As for Tyrant, here's a little bit on him. He was Galactus's first sentient creation pre dating the heralds by millions of years. Galactus made him with the intent of a father/son relationship and granted him near equal power to himself. Tyrant rebelled however and turned on Galactus with the latter barely beating him after a battle that destroyed many galaxies. Tyrant lived however bu was weakened. Way down the line he encountered various powerful beings to be exact, Silver Surfer, Beta Ray Bill, Gladiator, Ganymede, Jack of Hearts, Terrax and Morg. Out of them he beat the first 4 mentioned with great ease. The latter 2 wound up fighting each other and were subdued by Tyrant's Robot army with Jack sacrificing most of his power in an attempt to free everyone from Tyrant. Galactus himself came in the nick of time and saved them from Tyrant. Later still Thrant bested Galactus and was about to finish him when Morg Galactus' most loyal herald stopped him with the Ultimate Nullifier and sacrificed himself in the process. In short Tyrant is near Galactus level without the hunger weakness.