Model Settings

{
  "model": "claude-sonnet-4-6",
  "availableModels": ["sonnet", "haiku"],
  "modelOverrides": {
    "claude-opus-4-6": "arn:aws:bedrock:us-east-1::foundation-model/anthropic.claude-opus-v4"
  },
  "alwaysThinkingEnabled": false,
  "fastModePerSessionOptIn": true
}

model — override the default model for all sessions.
availableModels — restrict which models users can pick via /model, --model, Config tool, or ANTHROPIC_MODEL. Does NOT affect the "Default" option in the model picker.
modelOverrides — map Anthropic model IDs to provider-specific IDs (e.g. Bedrock ARNs).
alwaysThinkingEnabled — enable extended thinking by default (usually set via /config instead).
fastModePerSessionOptIn — when true, fast mode resets each session — user must re-enable with /fast each time.