diff --git a/.changeset/fix-tuple-schema-coercion-v2.md b/.changeset/fix-tuple-schema-coercion-v2.md
new file mode 100644
index 0000000000..accf940bd0
--- /dev/null
+++ b/.changeset/fix-tuple-schema-coercion-v2.md
@@ -0,0 +1,7 @@
+---
+'@tanstack/ai': patch
+'@tanstack/ai-utils': patch
+'@tanstack/openai-base': patch
+---
+
+Preserve positional tuple schemas and their null-widening metadata during strict output conversion.
diff --git a/packages/ai-utils/src/transforms.ts b/packages/ai-utils/src/transforms.ts
index c083952ad5..5b2e01589e 100644
--- a/packages/ai-utils/src/transforms.ts
+++ b/packages/ai-utils/src/transforms.ts
@@ -69,6 +69,7 @@ export type NullWideningMap = {
   widened?: boolean
   properties?: Record<string, NullWideningMap>
   items?: NullWideningMap | Array<NullWideningMap>
+  prefixItems?: Array<NullWideningMap>
 }
 
 function walk(value: unknown, map: NullWideningMap | undefined): unknown {
@@ -81,13 +82,13 @@ function walk(value: unknown, map: NullWideningMap | undefined): unknown {
   if (typeof value !== 'object' || !map) return value
 
   if (Array.isArray(value)) {
-    const { items } = map
-    if (!items) return value
-    // Tuple maps (`items: [a, b, …]`) describe each position separately;
-    // a single `items` map applies to every element.
-    return Array.isArray(items)
-      ? value.map((item, index) => walk(item, items[index]))
-      : value.map((item) => walk(item, items))
+    const { items, prefixItems } = map
+    if (!items && !prefixItems) return value
+    return value.map((item, index) => {
+      const prefixMap = prefixItems?.[index]
+      const itemMap = prefixMap ?? (Array.isArray(items) ? items[index] : items)
+      return walk(item, itemMap)
+    })
   }
 
   const { properties } = map
diff --git a/packages/ai/src/activities/chat/tools/schema-converter.ts b/packages/ai/src/activities/chat/tools/schema-converter.ts
index cda434bd1d..3ba7d234d8 100644
--- a/packages/ai/src/activities/chat/tools/schema-converter.ts
+++ b/packages/ai/src/activities/chat/tools/schema-converter.ts
@@ -145,20 +145,51 @@ function makeStructuredOutputCompatible(
           : nested.schema
         widenedHere = wasOptional
         childMap = nested.nullWidening
-      } else if (prop.type === 'array' && prop.items) {
-        const items = Array.isArray(prop.items) ? prop.items[0] : prop.items
-        const nestedItems = items
-          ? makeStructuredOutputCompatible(items, items.required || [])
-          : undefined
+      } else if (prop.type === 'array') {
+        const itemSchemas = prop.items
+          ? Array.isArray(prop.items)
+            ? prop.items
+            : [prop.items]
+          : []
+        const nestedItems = itemSchemas.map((item) =>
+          typeof item === 'object' && item !== null
+            ? makeStructuredOutputCompatible(item, item.required || [])
+            : undefined,
+        )
         properties[propName] = {
           ...prop,
-          items: nestedItems ? nestedItems.schema : prop.items,
+          ...(prop.items
+            ? {
+                items: Array.isArray(prop.items)
+                  ? nestedItems.map(
+                      (nested, index) => nested?.schema ?? itemSchemas[index],
+                    )
+                  : (nestedItems[0]?.schema ?? prop.items),
+              }
+            : {}),
           ...(wasOptional ? { type: ['array', 'null'] } : {}),
         }
         widenedHere = wasOptional
-        childMap = nestedItems?.nullWidening
-          ? { items: nestedItems.nullWidening }
+        const itemMaps = nestedItems.map((nested) => nested?.nullWidening ?? {})
+        childMap = itemMaps.some((itemMap) => Object.keys(itemMap).length > 0)
+          ? { items: Array.isArray(prop.items) ? itemMaps : itemMaps[0] }
           : undefined
+        if (Array.isArray(prop.prefixItems)) {
+          const prefixItems = prop.prefixItems.map((item) =>
+            typeof item === 'object' && item !== null
+              ? makeStructuredOutputCompatible(item, item.required || [])
+              : undefined,
+          )
+          properties[propName].prefixItems = prefixItems.map(
+            (nested, index) => nested?.schema ?? prop.prefixItems[index],
+          )
+          const prefixMaps = prefixItems.map(
+            (nested) => nested?.nullWidening ?? {},
+          )
+          if (prefixMaps.some((itemMap) => Object.keys(itemMap).length > 0)) {
+            childMap = { ...(childMap ?? {}), prefixItems: prefixMaps }
+          }
+        }
       } else if (wasOptional) {
         // Make optional fields nullable by adding null to the type. Mark
         // `widenedHere` only where we actually add `null`; a field already
@@ -188,16 +219,42 @@ function makeStructuredOutputCompatible(
     if (Object.keys(propertyMaps).length > 0) map.properties = propertyMaps
   }
 
-  // Handle array types with object items
-  if (result.type === 'array' && result.items) {
-    const items = Array.isArray(result.items) ? result.items[0] : result.items
-    if (items) {
-      const nestedItems = makeStructuredOutputCompatible(
-        items,
-        items.required || [],
+  // Handle array item and prefix-item schemas recursively.
+  if (result.type === 'array') {
+    if (result.items) {
+      const itemSchemas = Array.isArray(result.items)
+        ? result.items
+        : [result.items]
+      const nestedItems = itemSchemas.map((item) =>
+        typeof item === 'object' && item !== null
+          ? makeStructuredOutputCompatible(item, item.required || [])
+          : undefined,
+      )
+      result.items = Array.isArray(result.items)
+        ? nestedItems.map(
+            (nested, index) => nested?.schema ?? itemSchemas[index],
+          )
+        : (nestedItems[0]?.schema ?? result.items)
+      const itemMaps = nestedItems.map((nested) => nested?.nullWidening ?? {})
+      if (itemMaps.some((itemMap) => Object.keys(itemMap).length > 0)) {
+        map.items = Array.isArray(result.items) ? itemMaps : itemMaps[0]
+      }
+    }
+    if (Array.isArray(result.prefixItems)) {
+      const prefixSchemas = result.prefixItems.map((item) =>
+        typeof item === 'object' && item !== null
+          ? makeStructuredOutputCompatible(item, item.required || [])
+          : undefined,
+      )
+      result.prefixItems = prefixSchemas.map(
+        (nested, index) => nested?.schema ?? result.prefixItems[index],
       )
-      result.items = nestedItems.schema
-      if (nestedItems.nullWidening) map.items = nestedItems.nullWidening
+      const prefixMaps = prefixSchemas.map(
+        (nested) => nested?.nullWidening ?? {},
+      )
+      if (prefixMaps.some((itemMap) => Object.keys(itemMap).length > 0)) {
+        map.prefixItems = prefixMaps
+      }
     }
   }
 
diff --git a/packages/ai/tests/chat-structured-output-null-normalization.test.ts b/packages/ai/tests/chat-structured-output-null-normalization.test.ts
index 7d5a372bfd..7de6efee57 100644
--- a/packages/ai/tests/chat-structured-output-null-normalization.test.ts
+++ b/packages/ai/tests/chat-structured-output-null-normalization.test.ts
@@ -293,6 +293,20 @@ describe('convertSchemaForStructuredOutput → undoNullWidening round trip', ()
     expect('meta' in result).toBe(false)
   })
 
+  it('un-widens every item in a homogeneous array property', () => {
+    const outputSchema = z.object({
+      items: z.array(z.object({ label: z.string().optional() })),
+    })
+
+    const { nullWideningMap } = convertSchemaForStructuredOutput(outputSchema)
+    expect(
+      undoNullWidening(
+        { items: [{ label: null }, { label: null }, { label: 'kept' }] },
+        nullWideningMap,
+      ),
+    ).toEqual({ items: [{}, {}, { label: 'kept' }] })
+  })
+
   it('keeps a genuine `.nullable()` null inside array items', () => {
     // The widener does NOT touch `note` (it's `.nullable()`, not `.optional()`),
     // so its null must survive even though it sits inside an array item — the
diff --git a/packages/openai-base/src/utils/schema-converter.ts b/packages/openai-base/src/utils/schema-converter.ts
index 7732b1ffac..4ed91d0780 100644
--- a/packages/openai-base/src/utils/schema-converter.ts
+++ b/packages/openai-base/src/utils/schema-converter.ts
@@ -104,6 +104,7 @@ export function makeStructuredOutputCompatibleWithMap(
  * emit these.
  *
  * - `oneOf` / `allOf` / `not` — combinator keywords strict mode rejects
+ * - `prefixItems` — tuple keyword unsupported by OpenAI strict outputs
  * - `$ref` / `$defs` / `definitions` — references and definition pools whose
  *   object subschemas escape the `additionalProperties: false` normalization
  *   strict mode requires
@@ -115,6 +116,7 @@ const STRICT_UNSUPPORTED_KEYWORDS: ReadonlyArray<string> = [
   '$ref',
   '$defs',
   'definitions',
+  'prefixItems',
 ]
 
 /**
@@ -331,15 +333,10 @@ function coerceStrictSchema(
         prop = nested.schema
         childMap = nested.nullWideningMap
         hasUntrackableAnyOfWidening ||= nested.hasUntrackableAnyOfWidening
-      } else if (isSchemaObject(prop) && prop.type === 'array' && prop.items) {
-        const nested = coerceStrictSchema(prop.items, prop.items.required || [])
-        prop = {
-          ...prop,
-          items: nested.schema,
-        }
+      } else if (isSchemaObject(prop) && prop.type === 'array') {
+        const nested = coerceStrictSchema(prop, [])
+        prop = nested.schema
         childMap = nested.nullWideningMap
-          ? { items: nested.nullWideningMap }
-          : undefined
         hasUntrackableAnyOfWidening ||= nested.hasUntrackableAnyOfWidening
       } else if (isSchemaObject(prop) && prop.anyOf) {
         const nested = coerceStrictSchema(prop, prop.required || [])
@@ -411,12 +408,49 @@ function coerceStrictSchema(
   }
 
   if (result.type === 'array' && result.items) {
-    const nested = coerceStrictSchema(result.items, result.items.required || [])
-    result.items = nested.schema
-    if (nested.nullWideningMap) {
-      nullWideningMap.items = nested.nullWideningMap
+    if (Array.isArray(result.items)) {
+      const itemMaps: Array<NullWideningMap> = []
+      result.items = result.items.map((item) => {
+        if (!isSchemaObject(item)) {
+          itemMaps.push({})
+          return item
+        }
+        const nested = coerceStrictSchema(item, item.required || [])
+        itemMaps.push(nested.nullWideningMap ?? {})
+        hasUntrackableAnyOfWidening ||= nested.hasUntrackableAnyOfWidening
+        return nested.schema
+      })
+      if (itemMaps.some((map) => Object.keys(map).length > 0)) {
+        nullWideningMap.items = itemMaps
+      }
+    } else {
+      const nested = coerceStrictSchema(
+        result.items,
+        result.items.required || [],
+      )
+      result.items = nested.schema
+      if (nested.nullWideningMap) {
+        nullWideningMap.items = nested.nullWideningMap
+      }
+      hasUntrackableAnyOfWidening ||= nested.hasUntrackableAnyOfWidening
+    }
+  }
+
+  if (Array.isArray(result.prefixItems)) {
+    const itemMaps: Array<NullWideningMap> = []
+    result.prefixItems = result.prefixItems.map((item) => {
+      if (!isSchemaObject(item)) {
+        itemMaps.push({})
+        return item
+      }
+      const nested = coerceStrictSchema(item, item.required || [])
+      itemMaps.push(nested.nullWideningMap ?? {})
+      hasUntrackableAnyOfWidening ||= nested.hasUntrackableAnyOfWidening
+      return nested.schema
+    })
+    if (itemMaps.some((map) => Object.keys(map).length > 0)) {
+      nullWideningMap.prefixItems = itemMaps
     }
-    hasUntrackableAnyOfWidening ||= nested.hasUntrackableAnyOfWidening
   }
 
   if (result.anyOf && Array.isArray(result.anyOf)) {
diff --git a/packages/openai-base/tests/schema-converter.test.ts b/packages/openai-base/tests/schema-converter.test.ts
index 478bcfc4c0..c89fb96f18 100644
--- a/packages/openai-base/tests/schema-converter.test.ts
+++ b/packages/openai-base/tests/schema-converter.test.ts
@@ -433,7 +433,113 @@ describe('makeStructuredOutputCompatible', () => {
   })
 })
 
+it('preserves positional tuple item schemas', () => {
+  const items = [
+    { type: 'number', minimum: -180 },
+    { type: 'number', minimum: -90 },
+  ]
+  const schema = { type: 'array', items }
+
+  const result: any = makeStructuredOutputCompatible(schema)
+
+  expect(result.items).toEqual(items)
+})
+
+it('preserves tuple items nested in object properties', () => {
+  const schema = {
+    type: 'object',
+    properties: {
+      bbox: { type: 'array', items: [{ type: 'number' }, { type: 'number' }] },
+    },
+    required: ['bbox'],
+  }
+
+  const result: any = makeStructuredOutputCompatible(schema)
+
+  expect(result.properties.bbox.items).toEqual(schema.properties.bbox.items)
+})
+
+it('preserves boolean tuple schemas and positional metadata', () => {
+  const schema = {
+    type: 'array',
+    items: [
+      false,
+      {
+        type: 'object',
+        properties: { item: { type: 'string' } },
+        required: [],
+      },
+    ],
+    prefixItems: [
+      false,
+      {
+        type: 'object',
+        properties: { prefix: { type: 'string' } },
+        required: [],
+      },
+    ],
+    additionalItems: false,
+  }
+
+  const { nullWideningMap } = makeStructuredOutputCompatibleWithMap(schema)
+  const result: any = makeStructuredOutputCompatible(schema)
+
+  expect(result.items[0]).toBe(false)
+  expect(result.items[1].additionalProperties).toBe(false)
+  expect(result.prefixItems[0]).toBe(false)
+  expect(result.prefixItems[1].additionalProperties).toBe(false)
+  expect(
+    Array.isArray(nullWideningMap?.items) && nullWideningMap.items[1],
+  ).toEqual({
+    properties: { item: { widened: true } },
+  })
+  expect(nullWideningMap?.prefixItems?.[1]).toEqual({
+    properties: { prefix: { widened: true } },
+  })
+  expect(result.additionalItems).toBe(false)
+})
+
+it('preserves separate metadata for items and prefixItems', () => {
+  const schema = {
+    type: 'array',
+    items: [
+      {
+        type: 'object',
+        properties: { item: { type: 'string' } },
+        required: [],
+      },
+    ],
+    prefixItems: [
+      {
+        type: 'object',
+        properties: { prefix: { type: 'string' } },
+        required: [],
+      },
+    ],
+  }
+
+  const { nullWideningMap } = makeStructuredOutputCompatibleWithMap(schema)
+
+  expect(nullWideningMap?.items).toEqual([
+    { properties: { item: { widened: true } } },
+  ])
+  expect(nullWideningMap?.prefixItems).toEqual([
+    { properties: { prefix: { widened: true } } },
+  ])
+  const result: any = makeStructuredOutputCompatible(schema)
+  expect(result.prefixItems[0].additionalProperties).toBe(false)
+})
+
 describe('isStrictModeCompatible', () => {
+  it('rejects prefixItems for OpenAI strict outputs', () => {
+    expect(
+      isStrictModeCompatible({
+        type: 'array',
+        prefixItems: [{ type: 'string' }],
+      }),
+    ).toBe(false)
+  })
+
   it('returns true for a plain object schema in the strict subset', () => {
     expect(
       isStrictModeCompatible({
diff --git a/scripts/lovable-gateway.models.json b/scripts/lovable-gateway.models.json
index 8a193376e4..79c6babbc9 100644
--- a/scripts/lovable-gateway.models.json
+++ b/scripts/lovable-gateway.models.json
@@ -12,15 +12,8 @@
     "max_tokens": 65536,
     "knowledge": "2025-01",
     "modalities": {
-      "input": [
-        "text",
-        "image",
-        "audio",
-        "video"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image", "audio", "video"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -85,15 +78,8 @@
     "max_tokens": 65536,
     "knowledge": "2025-01",
     "modalities": {
-      "input": [
-        "text",
-        "image",
-        "video"
-      ],
-      "output": [
-        "text",
-        "image"
-      ]
+      "input": ["text", "image", "video"],
+      "output": ["text", "image"]
     },
     "pricing": {
       "input": {
@@ -150,15 +136,8 @@
     "max_tokens": 65536,
     "knowledge": "2025-01",
     "modalities": {
-      "input": [
-        "text",
-        "image",
-        "audio",
-        "video"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image", "audio", "video"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -222,12 +201,8 @@
     "context_window": 8192,
     "max_tokens": 16384,
     "modalities": {
-      "input": [
-        "text"
-      ],
-      "output": [
-        "audio"
-      ]
+      "input": ["text"],
+      "output": ["audio"]
     },
     "pricing": {
       "input": {
@@ -265,12 +240,8 @@
     "max_tokens": 16384,
     "knowledge": "2025-01",
     "modalities": {
-      "input": [
-        "text"
-      ],
-      "output": [
-        "audio"
-      ]
+      "input": ["text"],
+      "output": ["audio"]
     },
     "pricing": {
       "input": {
@@ -308,15 +279,8 @@
     "max_tokens": 65536,
     "knowledge": "2025-01",
     "modalities": {
-      "input": [
-        "text",
-        "image",
-        "audio",
-        "video"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image", "audio", "video"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -406,12 +370,8 @@
     "max_tokens": 16384,
     "knowledge": "2025-01",
     "modalities": {
-      "input": [
-        "text"
-      ],
-      "output": [
-        "audio"
-      ]
+      "input": ["text"],
+      "output": ["audio"]
     },
     "pricing": {
       "input": {
@@ -449,15 +409,8 @@
     "max_tokens": 65000,
     "knowledge": "2025-01",
     "modalities": {
-      "input": [
-        "text",
-        "image",
-        "audio",
-        "video"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image", "audio", "video"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -522,15 +475,8 @@
     "max_tokens": 32768,
     "knowledge": "2025-01",
     "modalities": {
-      "input": [
-        "text",
-        "image",
-        "video"
-      ],
-      "output": [
-        "text",
-        "image"
-      ]
+      "input": ["text", "image", "video"],
+      "output": ["text", "image"]
     },
     "pricing": {
       "input": {
@@ -595,15 +541,8 @@
     "max_tokens": 32768,
     "knowledge": "2025-01",
     "modalities": {
-      "input": [
-        "text",
-        "image",
-        "video"
-      ],
-      "output": [
-        "text",
-        "image"
-      ]
+      "input": ["text", "image", "video"],
+      "output": ["text", "image"]
     },
     "pricing": {
       "input": {
@@ -668,15 +607,8 @@
     "max_tokens": 65000,
     "knowledge": "2025-01",
     "modalities": {
-      "input": [
-        "text",
-        "image",
-        "audio",
-        "video"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image", "audio", "video"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -740,15 +672,8 @@
     "context_window": 65536,
     "max_tokens": 4096,
     "modalities": {
-      "input": [
-        "text",
-        "image",
-        "video"
-      ],
-      "output": [
-        "text",
-        "image"
-      ]
+      "input": ["text", "image", "video"],
+      "output": ["text", "image"]
     },
     "pricing": {
       "input": {
@@ -813,12 +738,8 @@
     "max_tokens": 16384,
     "knowledge": "2025-01",
     "modalities": {
-      "input": [
-        "text"
-      ],
-      "output": [
-        "audio"
-      ]
+      "input": ["text"],
+      "output": ["audio"]
     },
     "pricing": {
       "input": {
@@ -856,15 +777,8 @@
     "max_tokens": 64000,
     "knowledge": "2025-01",
     "modalities": {
-      "input": [
-        "text",
-        "image",
-        "audio",
-        "video"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image", "audio", "video"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -954,15 +868,8 @@
     "max_tokens": 64000,
     "knowledge": "2025-01",
     "modalities": {
-      "input": [
-        "text",
-        "image",
-        "audio",
-        "video"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image", "audio", "video"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -1027,15 +934,8 @@
     "max_tokens": 64000,
     "knowledge": "2026-03",
     "modalities": {
-      "input": [
-        "text",
-        "image",
-        "audio",
-        "video"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image", "audio", "video"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -1100,12 +1000,8 @@
     "max_tokens": 0,
     "knowledge": "2025-05",
     "modalities": {
-      "input": [
-        "text"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -1133,15 +1029,8 @@
     "max_tokens": 0,
     "knowledge": "2025-11",
     "modalities": {
-      "input": [
-        "text",
-        "image",
-        "audio",
-        "video"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image", "audio", "video"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -1192,13 +1081,8 @@
     "context_window": 0,
     "max_tokens": 0,
     "modalities": {
-      "input": [
-        "text",
-        "image"
-      ],
-      "output": [
-        "video"
-      ]
+      "input": ["text", "image"],
+      "output": ["video"]
     },
     "pricing": {
       "video_duration": {
@@ -1226,13 +1110,8 @@
     "context_window": 0,
     "max_tokens": 0,
     "modalities": {
-      "input": [
-        "text",
-        "image"
-      ],
-      "output": [
-        "video"
-      ]
+      "input": ["text", "image"],
+      "output": ["video"]
     },
     "pricing": {
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