support disable reasoning (#5568)

Author: colegottdank

worker/src/lib/ai-gateway/validators/chat-completion-types.ts

@@ -342,6 +342,7 @@ const CreateChatCompletionRequest = z
     verbosity: Verbosity.optional(),
     reasoning_effort: ReasoningEffort.optional(),
     reasoning_options: ReasoningOptions.optional(),
+    disable_reasoning: z.boolean().optional(),
     max_completion_tokens: z.number().int().nullish(),
     frequency_penalty: z.number().gte(-2).lte(2).nullish().default(0),
     presence_penalty: z.number().gte(-2).lte(2).nullish().default(0),

worker/src/lib/ai-gateway/validators/responses-types.ts

@@ -300,6 +300,7 @@ const ResponseProperties = z
     model: ModelIdsResponses,
     reasoning: z.union([Reasoning, z.null()]),
     reasoning_options: ReasoningOptions.optional(),
+    disable_reasoning: z.boolean().optional(),
     // background was removed
     max_output_tokens: z.union([z.number(), z.null()]),
     max_tool_calls: z.union([z.number(), z.null()]),