Under the hood
The model description schema now carries effort levels, capabilities, family, knowledge cutoff and per-family defaults.
The model-description schema now includes max_input_tokens, max_output_tokens, effort_levels, default_effort, capabilities, family, knowledge_cutoff, default_for_family, and fast_default_for_family fields, adding richer per-model metadata for effort and capability handling.
Names in the bundleeffort_levelsdefault_effortknowledge_cutoff
Documented inapi/release-notes/system-prompts/claude-fable-5