Native support for xAI Grok3

Model shorthand mapping related fixes
Comprehensive auto-mode related tests

providers/openai.py

@@ -1,10 +1,12 @@
 """OpenAI model provider implementation."""
 
 import logging
+from typing import Optional
 
 from .base import (
     FixedTemperatureConstraint,
     ModelCapabilities,
+    ModelResponse,
     ProviderType,
     RangeTemperatureConstraint,
 )
@@ -111,6 +113,29 @@ class OpenAIModelProvider(OpenAICompatibleProvider):
 
         return True
 
+    def generate_content(
+        self,
+        prompt: str,
+        model_name: str,
+        system_prompt: Optional[str] = None,
+        temperature: float = 0.7,
+        max_output_tokens: Optional[int] = None,
+        **kwargs,
+    ) -> ModelResponse:
+        """Generate content using OpenAI API with proper model name resolution."""
+        # Resolve model alias before making API call
+        resolved_model_name = self._resolve_model_name(model_name)
+
+        # Call parent implementation with resolved model name
+        return super().generate_content(
+            prompt=prompt,
+            model_name=resolved_model_name,
+            system_prompt=system_prompt,
+            temperature=temperature,
+            max_output_tokens=max_output_tokens,
+            **kwargs,
+        )
+
     def supports_thinking_mode(self, model_name: str) -> bool:
         """Check if the model supports extended thinking mode."""
         # Currently no OpenAI models support extended thinking