fix: Use correct calculation for input tokens

Author: tymondesigns

src/Providers/XAIModelInfoProvider.php

@@ -128,9 +128,11 @@ protected static function getCostPerToken(int $pricePerMillionTokens): float
      */
     protected static function getMaxInputTokens(array $body): ?int
     {
-        return str_starts_with($body['id'], 'grok-2-vision')
+        $tokens = str_starts_with($body['id'], 'grok-2-vision')
             ? 32768
             : 131072;
+
+        return (int) ($tokens * 0.9765625);
     }
 
     /**

tests/Unit/Providers/XAIModelInfoProviderTest.php

@@ -59,7 +59,7 @@
     expect($modelInfo->name)->toBe('grok-3-beta');
     expect($modelInfo->provider)->toBe(ModelProvider::XAI);
     expect($modelInfo->type)->toBe(ModelType::Chat);
-    expect($modelInfo->maxInputTokens)->toBe(131072);
+    expect($modelInfo->maxInputTokens)->toBe(128000);
     expect($modelInfo->maxOutputTokens)->toBeNull();
     expect($modelInfo->inputCostPerToken)->toBe(0.0002);
     expect($modelInfo->outputCostPerToken)->toBe(0.001);
@@ -104,7 +104,7 @@
     expect($modelInfo->name)->toBe('grok-2-vision-1212');
     expect($modelInfo->provider)->toBe(ModelProvider::XAI);
     expect($modelInfo->type)->toBe(ModelType::Chat);
-    expect($modelInfo->maxInputTokens)->toBe(32768);
+    expect($modelInfo->maxInputTokens)->toBe(32000);
     expect($modelInfo->maxOutputTokens)->toBeNull();
     expect($modelInfo->inputCostPerToken)->toBe(0.0002);
     expect($modelInfo->outputCostPerToken)->toBe(0.001);