diff --git a/packages/ai/src/providers/amazon-bedrock.ts b/packages/ai/src/providers/amazon-bedrock.ts
index c6aa377e..dd8d6123 100644
--- a/packages/ai/src/providers/amazon-bedrock.ts
+++ b/packages/ai/src/providers/amazon-bedrock.ts
@@ -188,7 +188,10 @@ export const streamBedrock: StreamFunction<"bedrock-converse-stream", BedrockOpt
 				modelId: model.id,
 				messages: convertMessages(context, model, cacheRetention),
 				system: buildSystemPrompt(context.systemPrompt, model, cacheRetention),
-				inferenceConfig: { maxTokens: options.maxTokens, temperature: options.temperature },
+				inferenceConfig: {
+					...(options.maxTokens !== undefined && { maxTokens: options.maxTokens }),
+					...(options.temperature !== undefined && { temperature: options.temperature }),
+				},
 				toolConfig: convertToolConfig(context.tools, options.toolChoice),
 				additionalModelRequestFields: buildAdditionalModelRequestFields(model, options),
 				...(options.requestMetadata !== undefined && { requestMetadata: options.requestMetadata }),
diff --git a/packages/ai/src/providers/simple-options.ts b/packages/ai/src/providers/simple-options.ts
index 6e478e64..35524aa8 100644
--- a/packages/ai/src/providers/simple-options.ts
+++ b/packages/ai/src/providers/simple-options.ts
@@ -3,7 +3,7 @@ import type { Api, Model, SimpleStreamOptions, StreamOptions, ThinkingBudgets, T
 export function buildBaseOptions(model: Model<Api>, options?: SimpleStreamOptions, apiKey?: string): StreamOptions {
 	return {
 		temperature: options?.temperature,
-		maxTokens: options?.maxTokens || Math.min(model.maxTokens, 32000),
+		maxTokens: options?.maxTokens ?? (model.maxTokens > 0 ? Math.min(model.maxTokens, 32000) : undefined),
 		signal: options?.signal,
 		apiKey: apiKey || options?.apiKey,
 		cacheRetention: options?.cacheRetention,