add gpt 4.5 (#538)

* add gpt 4.5

* changeset

* add sonnet 3.7 latest

* update changeset

Author: sameelarif

Diff for: .changeset/two-pumpkins-bake.md

@@ -0,0 +1,5 @@
+---
+"@browserbasehq/stagehand": minor
+---
+
+Added `gpt-4.5-preview` and `claude-3-7-sonnet-latest` as supported models.

Diff for: lib/llm/LLMProvider.ts

@@ -14,13 +14,15 @@ const modelToProviderMap: { [key in AvailableModel]: ModelProvider } = {
   "gpt-4o": "openai",
   "gpt-4o-mini": "openai",
   "gpt-4o-2024-08-06": "openai",
+  "gpt-4.5-preview": "openai",
   "o1-mini": "openai",
   "o1-preview": "openai",
   "o3-mini": "openai",
   "claude-3-5-sonnet-latest": "anthropic",
   "claude-3-5-sonnet-20240620": "anthropic",
   "claude-3-5-sonnet-20241022": "anthropic",
   "claude-3-7-sonnet-20250219": "anthropic",
+  "claude-3-7-sonnet-latest": "anthropic",
   "cerebras-llama-3.3-70b": "cerebras",
   "cerebras-llama-3.1-8b": "cerebras",
 };

Diff for: types/model.ts

@@ -6,9 +6,11 @@ export const AvailableModelSchema = z.enum([
   "gpt-4o",
   "gpt-4o-mini",
   "gpt-4o-2024-08-06",
+  "gpt-4.5-preview",
   "claude-3-5-sonnet-latest",
   "claude-3-5-sonnet-20241022",
   "claude-3-5-sonnet-20240620",
+  "claude-3-7-sonnet-latest",
   "claude-3-7-sonnet-20250219",
   "o1-mini",
   "o1-preview",