fix: address review feedback - differentiate duplicate model definitions and add error handling

Author: roomote

packages/types/src/providers/openai.ts

@@ -28,7 +28,7 @@ export const openAiNativeModels = {
 		inputPrice: 1.25,
 		outputPrice: 10.0,
 		cacheReadsPrice: 0.13,
-		description: "GPT-5: The best model for coding and agentic tasks across domains",
+		description: "GPT-5 (2025-08-07): Latest snapshot of GPT-5 model",
 		// supportsVerbosity is a new capability; ensure ModelInfo includes it
 		supportsVerbosity: true,
 		// GPT-5 supports Responses API reasoning summaries
@@ -64,7 +64,7 @@ export const openAiNativeModels = {
 		inputPrice: 0.25,
 		outputPrice: 2.0,
 		cacheReadsPrice: 0.03,
-		description: "GPT-5 Mini: A faster, more cost-efficient version of GPT-5 for well-defined tasks",
+		description: "GPT-5 Mini (2025-08-07): Latest snapshot of GPT-5 Mini model",
 		supportsVerbosity: true,
 		// GPT-5 supports Responses API reasoning summaries
 		supportsReasoningSummary: true,
@@ -98,7 +98,7 @@ export const openAiNativeModels = {
 		inputPrice: 0.05,
 		outputPrice: 0.4,
 		cacheReadsPrice: 0.01,
-		description: "GPT-5 Nano: Fastest, most cost-efficient version of GPT-5",
+		description: "GPT-5 Nano (2025-08-07): Latest snapshot of GPT-5 Nano model",
 		supportsVerbosity: true,
 		// GPT-5 supports Responses API reasoning summaries
 		supportsReasoningSummary: true,

src/api/providers/openai-native.ts

@@ -132,6 +132,9 @@ export class OpenAiNativeHandler extends BaseProvider implements SingleCompletio
 
 			// Defensive guard: if prev-id is present, we should never send more than one input item.
 			if (Array.isArray(newMessages) && newMessages.length !== 1) {
+				console.warn(
+					`Warning: When using previous_response_id, only one input item should be sent. Got ${newMessages.length} items.`,
+				)
 			}
 
 			requestBody.input =