Are opus sonnet gpt builtin shortcuts

Yes. OpenClaw ships a few default shorthands (only applied when the model exists in agents.defaults.models):
opus → anthropic/claude-opus-4-5
sonnet → anthropic/claude-sonnet-4-5
gpt → openai/gpt-5.2
gpt-mini → openai/gpt-5-mini
gemini → google/gemini-3-pro-preview
gemini-flash → google/gemini-3-flash-preview
If you set your own alias with the same name, your value wins.