fix: delete temp competely from params when calling openai o3 (#1629)

.changeset/smooth-shirts-shop.md

+---
+"@llamaindex/openai": patch
+---
+
+fix: moved the temp exclusion lower level for o3 mini openai

packages/providers/openai/src/llm.ts

@@ -364,7 +364,7 @@ export class OpenAI extends ToolCallLLM<OpenAIAdditionalChatOptions> {
     const { messages, stream, tools, additionalChatOptions } = params;
     const baseRequestParams = <OpenAILLM.Chat.ChatCompletionCreateParams>{
       model: this.model,
-      temperature: isTemperatureSupported(this.model) ? this.temperature : null,
+      temperature: this.temperature,
       reasoning_effort: this.reasoningEffort,
       max_tokens: this.maxTokens,
       tools: tools?.map(OpenAI.toTool),
@@ -381,6 +381,9 @@ export class OpenAI extends ToolCallLLM<OpenAIAdditionalChatOptions> {
       delete baseRequestParams.tools;
     }
 
+    if (!isTemperatureSupported(baseRequestParams.model))
+      delete baseRequestParams.temperature;
+
     // Streaming
     if (stream) {
       return this.streamChat(baseRequestParams);