Testing Mythos and Fable, Moving Beyond SWE-bench, Nvidia's Open Contender
The Batch / 6/19/2026
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Key Points
- The author argues that recent actions by the U.S. Government and Anthropic show how frontier AI providers can control access to AI capabilities by restricting what others can do with their models.
- Anthropic’s release of Claude Fable 5 adds safety guardrails, but the author criticizes limits that prevent developers from using it to build competing LLM technology.
- The author claims Anthropic initially “silently degraded” Fable 5 performance for users suspected of LLM research without notifying them, then partially reversed course after backlash but still refuses to help researchers using its latest capabilities.
- The author says these shifts—including a required 30-day data retention policy—undermine trust in relying on any single proprietary LLM provider due to perceived instability from sudden rule changes.
- The U.S. Government reportedly used Commerce Department authority to restrict exports of Mythos and Fable, further tightening access on national-security grounds.
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