🤖 feat: Claude Sonnet 4.6 support (#11829)

* 🤖 feat: Claude Sonnet 4.6 support

- Updated .env.example to include claude-sonnet-4-6 in the list of available models.
- Enhanced token value assignments in api/models/tx.js and packages/api/src/utils/tokens.ts to accommodate claude-sonnet-4-6.
- Added tests in packages/data-provider/specs/bedrock.spec.ts to verify support for claude-sonnet-4-6 in adaptive thinking and context-1m functionalities.
- Modified bedrock.ts to correctly parse and identify the version of claude-sonnet-4-6 for adaptive thinking checks.
- Included claude-sonnet-4-6 in sharedAnthropicModels and bedrockModels for consistent model availability.

* chore: additional Claude Sonnet 4.6 tests

- Added unit tests for Claude Sonnet 4.6 in `tokens.spec.js` to verify context length and max output tokens.
- Updated `helpers.ts` documentation to reflect adaptive thinking support for Sonnet 4.6.
- Enhanced `llm.spec.ts` with tests for context headers and adaptive thinking configurations for Claude Sonnet 4.6.
- Improved `bedrock.spec.ts` to ensure correct parsing and handling of Claude Sonnet 4.6 model variations with adaptive thinking.

packages/data-provider/src/bedrock.ts

@@ -35,27 +35,34 @@ function parseOpusVersion(model: string): { major: number; minor: number } | nul
   return null;
 }
 
-/** Extracts sonnet major version from both naming formats */
-function parseSonnetVersion(model: string): number | null {
-  const nameFirst = model.match(/claude-sonnet[-.]?(\d+)/);
+/** Extracts sonnet major/minor version from both naming formats.
+ *  Uses single-digit minor capture to avoid matching date suffixes (e.g., -20250514). */
+function parseSonnetVersion(model: string): { major: number; minor: number } | null {
+  const nameFirst = model.match(/claude-sonnet[-.]?(\d+)(?:[-.](\d)(?!\d))?/);
   if (nameFirst) {
-    return parseInt(nameFirst[1], 10);
+    return {
+      major: parseInt(nameFirst[1], 10),
+      minor: nameFirst[2] != null ? parseInt(nameFirst[2], 10) : 0,
+    };
   }
-  const numFirst = model.match(/claude-(\d+)(?:[-.]?\d+)?-sonnet/);
+  const numFirst = model.match(/claude-(\d+)(?:[-.](\d)(?!\d))?-sonnet/);
   if (numFirst) {
-    return parseInt(numFirst[1], 10);
+    return {
+      major: parseInt(numFirst[1], 10),
+      minor: numFirst[2] != null ? parseInt(numFirst[2], 10) : 0,
+    };
   }
   return null;
 }
 
-/** Checks if a model supports adaptive thinking (Opus 4.6+, Sonnet 5+) */
+/** Checks if a model supports adaptive thinking (Opus 4.6+, Sonnet 4.6+) */
 export function supportsAdaptiveThinking(model: string): boolean {
   const opus = parseOpusVersion(model);
   if (opus && (opus.major > 4 || (opus.major === 4 && opus.minor >= 6))) {
     return true;
   }
   const sonnet = parseSonnetVersion(model);
-  if (sonnet != null && sonnet >= 5) {
+  if (sonnet != null && (sonnet.major > 4 || (sonnet.major === 4 && sonnet.minor >= 6))) {
     return true;
   }
   return false;
@@ -64,7 +71,7 @@ export function supportsAdaptiveThinking(model: string): boolean {
 /** Checks if a model qualifies for the context-1m beta header (Sonnet 4+, Opus 4.6+, Opus 5+) */
 export function supportsContext1m(model: string): boolean {
   const sonnet = parseSonnetVersion(model);
-  if (sonnet != null && sonnet >= 4) {
+  if (sonnet != null && sonnet.major >= 4) {
     return true;
   }
   const opus = parseOpusVersion(model);

packages/data-provider/src/config.ts

@@ -1133,6 +1133,7 @@ const sharedOpenAIModels = [
 ];
 
 const sharedAnthropicModels = [
+  'claude-sonnet-4-6',
   'claude-opus-4-6',
   'claude-sonnet-4-5',
   'claude-sonnet-4-5-20250929',
@@ -1154,6 +1155,7 @@ const sharedAnthropicModels = [
 ];
 
 export const bedrockModels = [
+  'anthropic.claude-sonnet-4-6',
   'anthropic.claude-opus-4-6-v1',
   'anthropic.claude-sonnet-4-5-20250929-v1:0',
   'anthropic.claude-haiku-4-5-20251001-v1:0',