Coding Agents
Claude Fable 5 Leads GPT-5.6 Sol by More Than 3× on MirrorCode
Solve rate on long-horizon software reimplementation tasks
Claude Fable 5 Leads GPT-5.6 Sol by More Than 3× on MirrorCode
Why it matters: Claude Fable 5 solved 64% of Epoch AI’s MirrorCode tasks, more than triple GPT-5.6 Sol’s 20% solve rate on a benchmark that requires agents to rebuild complete software projects.
View source →- Source
- Epoch AI
- Unit
- Solve rate (%)
- Data as of
- August 3, 2026
- Scope
- Claude Fable 5 and GPT-5.6 Sol