model-safety

Anthropic released Claude Opus 4.8 on May 28, 2026, replacing Opus 4.7 at unchanged pricing. The company claims the model's misalignment rates match those of Claude Mythos Preview, the experimental model deemed too dangerous for public release in April 2026. Opus 4.8 delivers faster thinking modes at one-third the cost of version 4.7.

Anthropic has released Claude Opus 4.7, its most powerful generally available model, though it scores lower than the company's Mythos Preview model on every evaluation. The company intentionally reduced Opus 4.7's cybersecurity capabilities during training as it tests safety measures before releasing more powerful models.