Function getModelParams

src/api/transform/model-params.ts:75–196

({
	format,
	modelId,
	model,
	settings,
	defaultTemperature,
}: GetModelParamsOptions<Format>)

export function getModelParams(options: GetModelParamsOptions<"gemini">): GeminiModelParams
export function getModelParams(options: GetModelParamsOptions<"openrouter">): OpenRouterModelParams
export function getModelParams({
	format,
	modelId,
	model,
	settings,
	defaultTemperature,
}: GetModelParamsOptions<Format>): ModelParams {
	const {
		modelMaxTokens: customMaxTokens,
		modelMaxThinkingTokens: customMaxThinkingTokens,
		modelTemperature: customTemperature,
		reasoningEffort: customReasoningEffort,
		verbosity: customVerbosity,
	} = settings

	// Use the centralized logic for computing maxTokens
	const maxTokens = getModelMaxOutputTokens({
		modelId,
		model,
		settings,
		format,
	})

	let temperature = customTemperature ?? model.defaultTemperature ?? defaultTemperature
	let reasoningBudget: ModelParams["reasoningBudget"] = undefined
	let reasoningEffort: ModelParams["reasoningEffort"] = undefined
	const verbosity: VerbosityLevel | undefined = customVerbosity

	if (shouldUseReasoningBudget({ model, settings })) {
		// Check if this is a Gemini 2.5 Pro model
		const isGemini25Pro = modelId.includes("gemini-2.5-pro")

		// If `customMaxThinkingTokens` is not specified use the default.
		// For Gemini 2.5 Pro, default to 128 instead of 8192
		const defaultThinkingTokens = isGemini25Pro
			? GEMINI_25_PRO_MIN_THINKING_TOKENS
			: DEFAULT_HYBRID_REASONING_MODEL_THINKING_TOKENS
		reasoningBudget = customMaxThinkingTokens ?? defaultThinkingTokens

		// Reasoning cannot exceed 80% of the `maxTokens` value.
		// maxTokens should always be defined for reasoning budget models, but add a guard just in case
		if (maxTokens && reasoningBudget > Math.floor(maxTokens * 0.8)) {
			reasoningBudget = Math.floor(maxTokens * 0.8)
		}

		// Reasoning cannot be less than minimum tokens.
		// For Gemini 2.5 Pro models, the minimum is 128 tokens
		// For other models, the minimum is 1024 tokens
		const minThinkingTokens = isGemini25Pro ? GEMINI_25_PRO_MIN_THINKING_TOKENS : 1024
		if (reasoningBudget < minThinkingTokens) {
			reasoningBudget = minThinkingTokens
		}

		// Let's assume that "Hybrid" reasoning models require a temperature of
		// 1.0 since Anthropic does.
		temperature = 1.0
	} else if (shouldUseReasoningEffort({ model, settings })) {
		// "Traditional" reasoning models use the `reasoningEffort` parameter.