Training for Mythos finished in February, 2026 while training for Opus 4.7 finished around that same time.

If I understand correctly, Opus 4.7 was launched as nerfed Mythos with some improvements from 4.6.

Anthropic launches major bumps (like 4.6 to 4.7) every 4 - 5 months. So by all accounts, Mythos should be released by July.

The problem reduces to: How quickly can competing models surpass Opus 4.7 and start taking over Anthropic's market share?