diff --git a/NEXT_CHANGELOG.md b/NEXT_CHANGELOG.md
index 282e45c07..c4453886d 100644
--- a/NEXT_CHANGELOG.md
+++ b/NEXT_CHANGELOG.md
@@ -8,6 +8,8 @@
 
 ### Bug Fixes
 
+- Accept both JSON numbers and decimal strings when deserializing int64 (`Long`) response fields.
+
 ### Security Vulnerabilities
 
 ### Documentation
diff --git a/databricks-sdk-java/src/main/java/com/databricks/sdk/core/utils/SerDeUtils.java b/databricks-sdk-java/src/main/java/com/databricks/sdk/core/utils/SerDeUtils.java
index 7cad48514..646bcbc1d 100644
--- a/databricks-sdk-java/src/main/java/com/databricks/sdk/core/utils/SerDeUtils.java
+++ b/databricks-sdk-java/src/main/java/com/databricks/sdk/core/utils/SerDeUtils.java
@@ -5,6 +5,9 @@
 import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.SerializationFeature;
+import com.fasterxml.jackson.databind.cfg.CoercionAction;
+import com.fasterxml.jackson.databind.cfg.CoercionInputShape;
+import com.fasterxml.jackson.databind.type.LogicalType;
 import com.fasterxml.jackson.datatype.guava.GuavaModule;
 import com.fasterxml.jackson.datatype.jdk8.Jdk8Module;
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
@@ -26,6 +29,13 @@ public static ObjectMapper createMapper() {
         .configure(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY, true)
         .configure(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_AS_NULL, true)
         .setSerializationInclusion(JsonInclude.Include.NON_NULL);
+
+    // Databricks services return int64 fields as either JSON numbers (123) or decimal strings
+    // ("123"). Pin String->integer coercion so both deserialize into Long. Jackson does this by
+    // default; pinning it guards against a silent regression if that default is ever tightened.
+    mapper
+        .coercionConfigFor(LogicalType.Integer)
+        .setCoercion(CoercionInputShape.String, CoercionAction.TryConvert);
     return mapper;
   }
 }
diff --git a/databricks-sdk-java/src/test/java/com/databricks/sdk/core/utils/SerDeUtilsInt64Test.java b/databricks-sdk-java/src/test/java/com/databricks/sdk/core/utils/SerDeUtilsInt64Test.java
new file mode 100644
index 000000000..322753659
--- /dev/null
+++ b/databricks-sdk-java/src/test/java/com/databricks/sdk/core/utils/SerDeUtilsInt64Test.java
@@ -0,0 +1,132 @@
+package com.databricks.sdk.core.utils;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertInstanceOf;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import org.junit.jupiter.api.Test;
+
+/**
+ * Verifies that int64 ({@code Long}) fields deserialize from both JSON numbers ({@code 123}) and
+ * decimal strings ({@code "123"}), which Databricks services use interchangeably. The behavior is
+ * pinned in {@link SerDeUtils#createMapper()}; this mirrors the Go SDK's {@code
+ * marshal/int64_test.go}.
+ */
+public class SerDeUtilsInt64Test {
+  private final ObjectMapper mapper = SerDeUtils.createMapper();
+
+  public static class LongHolder {
+    public Long value;
+  }
+
+  public static class Inner {
+    public Long id;
+  }
+
+  public static class Outer {
+    public Inner inner;
+  }
+
+  public static class ListHolder {
+    public List<Long> values;
+  }
+
+  public static class MapHolder {
+    public Map<String, Long> counts;
+  }
+
+  public static class Mixed {
+    public Long id;
+    public String name;
+  }
+
+  public static class UntypedHolder {
+    public Object payload;
+  }
+
+  @Test
+  public void topLevelLongFromNumberAndString() throws JsonProcessingException {
+    assertEquals(Long.valueOf(123L), mapper.readValue("123", Long.class));
+    assertEquals(Long.valueOf(123L), mapper.readValue("\"123\"", Long.class));
+  }
+
+  @Test
+  public void longFieldFromNumberAndString() throws JsonProcessingException {
+    assertEquals(Long.valueOf(123L), mapper.readValue("{\"value\":123}", LongHolder.class).value);
+    assertEquals(
+        Long.valueOf(123L), mapper.readValue("{\"value\":\"123\"}", LongHolder.class).value);
+  }
+
+  @Test
+  public void nestedLongFromString() throws JsonProcessingException {
+    Outer out = mapper.readValue("{\"inner\":{\"id\":\"456\"}}", Outer.class);
+    assertEquals(Long.valueOf(456L), out.inner.id);
+  }
+
+  @Test
+  public void listOfLongAcceptsMixedForms() throws JsonProcessingException {
+    ListHolder h = mapper.readValue("{\"values\":[\"1\",2,\"3\"]}", ListHolder.class);
+    assertEquals(Arrays.asList(1L, 2L, 3L), h.values);
+  }
+
+  @Test
+  public void mapOfLongAcceptsMixedForms() throws JsonProcessingException {
+    MapHolder h = mapper.readValue("{\"counts\":{\"a\":\"1\",\"b\":2}}", MapHolder.class);
+    assertEquals(Long.valueOf(1L), h.counts.get("a"));
+    assertEquals(Long.valueOf(2L), h.counts.get("b"));
+  }
+
+  @Test
+  public void boundaryValuesFromNumberAndString() throws JsonProcessingException {
+    assertEquals(
+        Long.valueOf(Long.MAX_VALUE),
+        mapper.readValue("{\"value\":9223372036854775807}", LongHolder.class).value);
+    assertEquals(
+        Long.valueOf(Long.MAX_VALUE),
+        mapper.readValue("{\"value\":\"9223372036854775807\"}", LongHolder.class).value);
+    assertEquals(
+        Long.valueOf(Long.MIN_VALUE),
+        mapper.readValue("{\"value\":-9223372036854775808}", LongHolder.class).value);
+    assertEquals(
+        Long.valueOf(Long.MIN_VALUE),
+        mapper.readValue("{\"value\":\"-9223372036854775808\"}", LongHolder.class).value);
+  }
+
+  @Test
+  public void invalidNumericStringFails() {
+    assertThrows(
+        JsonProcessingException.class,
+        () -> mapper.readValue("{\"value\":\"not-an-int\"}", LongHolder.class));
+  }
+
+  @Test
+  public void overflowStringFails() {
+    // 20 nines: larger than Long.MAX_VALUE.
+    assertThrows(
+        JsonProcessingException.class,
+        () -> mapper.readValue("{\"value\":\"99999999999999999999\"}", LongHolder.class));
+  }
+
+  @Test
+  public void stringFieldIsNotCoercedToNumber() throws JsonProcessingException {
+    Mixed m = mapper.readValue("{\"id\":\"5\",\"name\":\"5\"}", Mixed.class);
+    assertEquals(Long.valueOf(5L), m.id);
+    assertEquals("5", m.name);
+  }
+
+  @Test
+  public void untypedFieldPreservesJsonForm() throws JsonProcessingException {
+    // Coercion only targets integer-typed fields, so an untyped field keeps its JSON form.
+    UntypedHolder asString = mapper.readValue("{\"payload\":\"123\"}", UntypedHolder.class);
+    assertInstanceOf(String.class, asString.payload);
+    assertEquals("123", asString.payload);
+
+    UntypedHolder asNumber = mapper.readValue("{\"payload\":123}", UntypedHolder.class);
+    assertInstanceOf(Number.class, asNumber.payload);
+  }
+}