AI / Claude Models Basics Interview Questions
What is Claude Mythos 5 and how does it differ from Claude Fable 5?
Claude Mythos 5 (claude-mythos-5) is a variant of Claude Fable 5 that is offered separately for defensive cybersecurity workflows as part of Anthropic's Project Glasswing. It is not publicly available — access is invitation-only with no self-serve sign-up.
| Feature | Claude Fable 5 | Claude Mythos 5 |
|---|---|---|
| API ID | claude-fable-5 | claude-mythos-5 |
| Availability | Generally available (GA) | Invitation-only via Project Glasswing |
| Safety classifiers | Yes — standard safety classifiers | Without standard safety classifiers |
| Intended use | General purpose, agents, enterprise | Defensive cybersecurity workflows |
| Context window | 1 million tokens | 1 million tokens |
| Max output | 128,000 tokens | 128,000 tokens |
| Pricing | $10 / $50 per MTok | Contact Anthropic |
The key architectural difference is that Mythos 5 operates without the standard safety classifiers that Fable 5 uses. This makes it suitable for certain security research and offensive-capability testing in a controlled, vetted environment — but unsuitable and inaccessible for general use. Anthropic controls access tightly through Project Glasswing.
What makes Claude Mythos 5 different from Claude Fable 5 in terms of safety?
How does a team gain access to Claude Mythos 5?
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