Fix hard-coded model names.

Author: jasperblues

src/main/kotlin/com/embabel/hub/integrations/LlmProvider.kt

@@ -1,6 +1,8 @@
 package com.embabel.hub.integrations
 
+import com.embabel.agent.api.models.AnthropicModels
 import com.embabel.agent.api.models.DeepSeekModels
+import com.embabel.agent.api.models.OpenAiModels
 
 /**
  * Supported LLM providers for BYOK (Bring Your Own Key).
@@ -14,18 +16,18 @@ enum class LlmProvider(
     val validationModel: String = chatModel,
 ) {
     OPENAI(
-        chatModel = "gpt-4.1",
-        classifierModel = "gpt-4.1-mini",
-        narratorModel = "gpt-4.1-mini",
-        summarizerModel = "gpt-4.1-nano",
-        validationModel = "gpt-4.1-nano",
+        chatModel = OpenAiModels.GPT_41,
+        classifierModel = OpenAiModels.GPT_41_MINI,
+        narratorModel = OpenAiModels.GPT_41_MINI,
+        summarizerModel = OpenAiModels.GPT_41_NANO,
+        validationModel = OpenAiModels.GPT_41_NANO,
     ),
     ANTHROPIC(
-        chatModel = "claude-sonnet-4-6",
-        classifierModel = "claude-haiku-4-5",
-        narratorModel = "claude-haiku-4-5",
-        summarizerModel = "claude-haiku-4-5",
-        validationModel = "claude-haiku-4-5",
+        chatModel = AnthropicModels.CLAUDE_SONNET_4_6,
+        classifierModel = AnthropicModels.CLAUDE_HAIKU_4_5,
+        narratorModel = AnthropicModels.CLAUDE_HAIKU_4_5,
+        summarizerModel = AnthropicModels.CLAUDE_HAIKU_4_5,
+        validationModel = AnthropicModels.CLAUDE_HAIKU_4_5,
     ),
     MISTRAL(
         chatModel = "mistral-large-latest",