🧪 feat: Claude Sonnet 4 - 1M Context Window (Beta Header) (#9093)

* adding beta header context-1m-2025-08-07 to claude sonnet 4 to increase contact window to 1M tokens

* adding context-1m beta header to test cases

* ci: Update Anthropic `getLLMConfig` tests and headers for model variations

- Refactored test cases to ensure proper handling of model variations for 'claude-sonnet-4'.
- Cleaned up unused mock implementations in tests for better clarity and performance.

* refactor: regex in header retrieval for 'claude-sonnet-4' models

* refactor: default tokens for 'claude-sonnet-4' to `1,000,000`

* refactor: add token value retrieval and pattern matching to model tests

---------

Co-authored-by: Dirk Petersen <no-reply@nowhere.com>

api/utils/tokens.js

@@ -108,7 +108,7 @@ const anthropicModels = {
   'claude-3.7-sonnet': 200000,
   'claude-3-5-sonnet-latest': 200000,
   'claude-3.5-sonnet-latest': 200000,
-  'claude-sonnet-4': 200000,
+  'claude-sonnet-4': 1000000,
   'claude-opus-4': 200000,
   'claude-4': 200000,
 };
@@ -487,5 +487,7 @@ module.exports = {
   matchModelName,
   processModelData,
   getModelMaxTokens,
+  getModelTokenValue,
+  findMatchingPattern,
   getModelMaxOutputTokens,
 };