diff --git a/.changeset/gentle-dots-fallback-timestamps.md b/.changeset/gentle-dots-fallback-timestamps.md
new file mode 100644
index 000000000..43420ced7
--- /dev/null
+++ b/.changeset/gentle-dots-fallback-timestamps.md
@@ -0,0 +1,5 @@
+---
+'@tanstack/ai': patch
+---
+
+Fix fallback structured-output lifecycle timestamps being emitted before the provider request settles.
diff --git a/packages/ai/tests/chat-structured-output-stream.test.ts b/packages/ai/tests/chat-structured-output-stream.test.ts
index 84e996908..29dc0a08a 100644
--- a/packages/ai/tests/chat-structured-output-stream.test.ts
+++ b/packages/ai/tests/chat-structured-output-stream.test.ts
@@ -480,6 +480,85 @@ describe('chat({ outputSchema, stream: true })', () => {
       expect(finished).toBeDefined()
       expect('usage' in finished!).toBe(false)
     })
+
+    it('keeps synthesized lifecycle timestamps ordered after a delayed provider result', async () => {
+      const adapter = makeAdapter({
+        structuredOutput: async () => {
+          await new Promise((resolve) => setTimeout(resolve, 5))
+          return { data: validPerson, rawText: JSON.stringify(validPerson) }
+        },
+      })
+
+      const stream = chat({
+        adapter,
+        messages: [{ role: 'user', content: 'extract' }],
+        outputSchema: PersonSchema,
+        stream: true,
+      })
+
+      const chunks = await collectChunks(stream)
+      const runStarted = chunks.find((c) => c.type === EventType.RUN_STARTED)
+      const start = chunks.find(
+        (c) =>
+          c.type === EventType.CUSTOM &&
+          (c as { name?: string }).name === 'structured-output.start',
+      )
+      const textStart = chunks.find(
+        (c) => c.type === EventType.TEXT_MESSAGE_START,
+      )
+      const content = chunks.find(
+        (c) => c.type === EventType.TEXT_MESSAGE_CONTENT,
+      )
+      const complete = chunks.find(
+        (c) =>
+          c.type === EventType.CUSTOM &&
+          (c as { name?: string }).name === 'structured-output.complete',
+      )
+      const finished = chunks.find((c) => c.type === EventType.RUN_FINISHED)
+
+      expect(runStarted).toBeDefined()
+      expect(start).toBeDefined()
+      expect(textStart).toBeDefined()
+      expect(content).toBeDefined()
+      expect(complete).toBeDefined()
+      expect(finished).toBeDefined()
+      expect(runStarted!.timestamp!).toBeLessThanOrEqual(start!.timestamp!)
+      expect(start!.timestamp!).toBeLessThanOrEqual(textStart!.timestamp!)
+      expect(textStart!.timestamp!).toBeLessThanOrEqual(content!.timestamp!)
+      expect(content!.timestamp!).toBeLessThanOrEqual(complete!.timestamp!)
+      expect(complete!.timestamp!).toBeLessThanOrEqual(finished!.timestamp!)
+    })
+
+    it('keeps synthesized error lifecycle timestamps ordered after a delayed provider rejection', async () => {
+      const adapter = makeAdapter({
+        structuredOutput: async () => {
+          await new Promise((resolve) => setTimeout(resolve, 5))
+          throw new Error('provider rejected the request')
+        },
+      })
+
+      const stream = chat({
+        adapter,
+        messages: [{ role: 'user', content: 'extract' }],
+        outputSchema: PersonSchema,
+        stream: true,
+      })
+
+      const chunks = await collectChunks(stream)
+      const runStarted = chunks.find((c) => c.type === EventType.RUN_STARTED)
+      const start = chunks.find(
+        (c) =>
+          c.type === EventType.CUSTOM &&
+          (c as { name?: string }).name === 'structured-output.start',
+      )
+      const error = chunks.find((c) => c.type === EventType.RUN_ERROR)
+
+      expect(runStarted).toBeDefined()
+      expect(start).toBeDefined()
+      expect(error).toBeDefined()
+      expect(runStarted!.timestamp!).toBeLessThanOrEqual(start!.timestamp!)
+      expect(start!.timestamp!).toBeLessThanOrEqual(error!.timestamp!)
+    })
   })
 
   describe('lifecycle ordering', () => {
diff --git a/scripts/lovable-gateway.models.json b/scripts/lovable-gateway.models.json
index 8a193376e..79c6babbc 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": {
       "video_duration": {
@@ -1260,13 +1139,8 @@
     "context_window": 0,
     "max_tokens": 0,
     "modalities": {
-      "input": [
-        "text",
-        "image"
-      ],
-      "output": [
-        "video"
-      ]
+      "input": ["text", "image"],
+      "output": ["video"]
     },
     "pricing": {
       "video_duration": {
@@ -1291,13 +1165,8 @@
     "context_window": 16000,
     "max_tokens": 2000,
     "modalities": {
-      "input": [
-        "text",
-        "audio"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "audio"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -1342,12 +1211,8 @@
     "context_window": 2000,
     "max_tokens": 0,
     "modalities": {
-      "input": [
-        "text"
-      ],
-      "output": [
-        "audio"
-      ]
+      "input": ["text"],
+      "output": ["audio"]
     },
     "pricing": {
       "input": {
@@ -1384,13 +1249,8 @@
     "context_window": 16000,
     "max_tokens": 2000,
     "modalities": {
-      "input": [
-        "text",
-        "audio"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "audio"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -1436,13 +1296,8 @@
     "max_tokens": 128000,
     "knowledge": "2024-09-30",
     "modalities": {
-      "input": [
-        "text",
-        "image"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -1526,13 +1381,8 @@
     "max_tokens": 128000,
     "knowledge": "2024-05-30",
     "modalities": {
-      "input": [
-        "text",
-        "image"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -1616,13 +1466,8 @@
     "max_tokens": 128000,
     "knowledge": "2024-05-30",
     "modalities": {
-      "input": [
-        "text",
-        "image"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -1671,13 +1516,8 @@
     "max_tokens": 128000,
     "knowledge": "2024-10",
     "modalities": {
-      "input": [
-        "text",
-        "image"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -1761,13 +1601,8 @@
     "max_tokens": 128000,
     "knowledge": "2025-08-31",
     "modalities": {
-      "input": [
-        "text",
-        "image"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -1866,13 +1701,8 @@
     "max_tokens": 128000,
     "knowledge": "2025-08-31",
     "modalities": {
-      "input": [
-        "text",
-        "image"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -1956,13 +1786,8 @@
     "max_tokens": 128000,
     "knowledge": "2025-08-31",
     "modalities": {
-      "input": [
-        "text",
-        "image"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -2011,13 +1836,8 @@
     "max_tokens": 128000,
     "knowledge": "2025-08-31",
     "modalities": {
-      "input": [
-        "text",
-        "image"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -2081,13 +1901,8 @@
     "max_tokens": 128000,
     "knowledge": "2025-12-01",
     "modalities": {
-      "input": [
-        "text",
-        "image"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -2186,13 +2001,8 @@
     "max_tokens": 128000,
     "knowledge": "2025-12-01",
     "modalities": {
-      "input": [
-        "text",
-        "image"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -2256,13 +2066,8 @@
     "max_tokens": 128000,
     "knowledge": "2026-02-16",
     "modalities": {
-      "input": [
-        "text",
-        "image"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -2361,13 +2166,8 @@
     "max_tokens": 128000,
     "knowledge": "2026-02-16",
     "modalities": {
-      "input": [
-        "text",
-        "image"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -2466,13 +2266,8 @@
     "max_tokens": 128000,
     "knowledge": "2026-02-16",
     "modalities": {
-      "input": [
-        "text",
-        "image"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text", "image"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -2570,13 +2365,8 @@
     "context_window": 0,
     "max_tokens": 0,
     "modalities": {
-      "input": [
-        "text",
-        "image"
-      ],
-      "output": [
-        "image"
-      ]
+      "input": ["text", "image"],
+      "output": ["image"]
     },
     "pricing": {
       "input": {
@@ -2621,13 +2411,8 @@
     "context_window": 0,
     "max_tokens": 0,
     "modalities": {
-      "input": [
-        "text",
-        "image"
-      ],
-      "output": [
-        "image"
-      ]
+      "input": ["text", "image"],
+      "output": ["image"]
     },
     "pricing": {
       "input": {
@@ -2672,12 +2457,8 @@
     "context_window": 8191,
     "max_tokens": 0,
     "modalities": {
-      "input": [
-        "text"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {
@@ -2704,12 +2485,8 @@
     "context_window": 8191,
     "max_tokens": 0,
     "modalities": {
-      "input": [
-        "text"
-      ],
-      "output": [
-        "text"
-      ]
+      "input": ["text"],
+      "output": ["text"]
     },
     "pricing": {
       "input": {