diff --git a/aibridge/intercept/messages/base.go b/aibridge/intercept/messages/base.go
index 7c895595e9799..0fbe21c5f948f 100644
--- a/aibridge/intercept/messages/base.go
+++ b/aibridge/intercept/messages/base.go
@@ -417,7 +417,8 @@ func bedrockModelSupportsAdaptiveThinking(model string) bool {
 //
 // See https://docs.aws.amazon.com/bedrock/latest/userguide/model-card-anthropic-claude-opus-4-7.html
 func bedrockModelRequiresAdaptiveThinking(model string) bool {
-	return strings.Contains(model, "anthropic.claude-opus-4-7")
+	return strings.Contains(model, "anthropic.claude-opus-4-7") ||
+		strings.Contains(model, "anthropic.claude-opus-4-8")
 }
 
 // filterBedrockBetaFlags removes unsupported beta flags from the Anthropic-Beta
diff --git a/aibridge/intercept/messages/base_internal_test.go b/aibridge/intercept/messages/base_internal_test.go
index 0b2ee4d77be84..714f32b2c0f81 100644
--- a/aibridge/intercept/messages/base_internal_test.go
+++ b/aibridge/intercept/messages/base_internal_test.go
@@ -759,6 +759,12 @@ func TestAugmentRequestForBedrock_AdaptiveThinking(t *testing.T) {
 			requestBody:        `{"max_tokens":10000,"thinking":{"type":"enabled","budget_tokens":8000}}`,
 			expectThinkingType: "adaptive",
 		},
+		{
+			name:               "opus_4_8_model_with_enabled_thinking_is_converted_to_adaptive_and_drops_budget",
+			bedrockModel:       "eu.anthropic.claude-opus-4-8",
+			requestBody:        `{"max_tokens":10000,"thinking":{"type":"enabled","budget_tokens":5000}}`,
+			expectThinkingType: "adaptive",
+		},
 		{
 			// Opus 4.7 on Bedrock rejects output_config.format (structured
 			// outputs) with a 400 even though it accepts output_config.effort.