Function modelSupportsAdaptiveThinking

src/utils/thinking.ts:115–146

(model: string)

// @[MODEL LAUNCH]: Add the new model to the allowlist if it supports adaptive thinking.
export function modelSupportsAdaptiveThinking(model: string): boolean {
  const supported3P = get3PModelCapabilityOverride(model, 'adaptive_thinking')
  if (supported3P !== undefined) {
    return supported3P
  }
  const canonical = getCanonicalName(model)
  // Supported by a subset of Claude 4 models
  if (canonical.includes('opus-4-6') || canonical.includes('sonnet-4-6')) {
    return true
  }
  // Exclude any other known legacy models (allowlist above catches 4-6 variants first)
  if (
    canonical.includes('opus') ||
    canonical.includes('sonnet') ||
    canonical.includes('haiku')
  ) {
    return false
  }
  // IMPORTANT: Do not change adaptive thinking support without notifying the
  // model launch DRI and research. This can greatly affect model quality and
  // bashing.

  // Newer models (4.6+) are all trained on adaptive thinking and MUST have it
  // enabled for model testing. DO NOT default to false for first party, otherwise
  // we may silently degrade model quality.

  // Default to true for unknown model strings on 1P and Foundry (because Foundry
  // is a proxy). Do not default to true for other 3P as they have different formats
  // for their model strings.
  const provider = getAPIProvider()
  return provider === 'firstParty' || provider === 'foundry'
}

export function shouldEnableThinkingByDefault(): boolean {
  if (process.env.MAX_THINKING_TOKENS) {