fix(ai): parse compatible reasoning deltas

packages/ai/src/protocols/openai-chat.ts

@@ -75,6 +75,8 @@ const OpenAIChatMessage = Schema.Union([
     content: Schema.NullOr(Schema.String),
     tool_calls: optionalArray(OpenAIChatAssistantToolCall),
     reasoning_content: Schema.optional(Schema.String),
+    reasoning: Schema.optional(Schema.String),
+    reasoning_text: Schema.optional(Schema.String),
   }),
   Schema.Struct({ role: Schema.Literal("tool"), tool_call_id: Schema.String, content: Schema.String }),
 ]).pipe(Schema.toTaggedUnion("role"))
@@ -145,6 +147,8 @@ type OpenAIChatToolCallDelta = Schema.Schema.Type<typeof OpenAIChatToolCallDelta
 const OpenAIChatDelta = Schema.Struct({
   content: optionalNull(Schema.String),
   reasoning_content: optionalNull(Schema.String),
+  reasoning: optionalNull(Schema.String),
+  reasoning_text: optionalNull(Schema.String),
   tool_calls: optionalNull(Schema.Array(OpenAIChatToolCallDelta)),
 })
 
@@ -166,6 +170,7 @@ export interface ParserState {
   readonly usage?: Usage
   readonly finishReason?: FinishReason
   readonly lifecycle: Lifecycle.State
+  readonly reasoningField?: "reasoning" | "reasoning_content" | "reasoning_text"
 }
 
 // =============================================================================
@@ -208,6 +213,12 @@ const lowerMedia = Effect.fn("OpenAIChat.lowerMedia")(function* (part: MediaPart
 const openAICompatibleReasoningContent = (native: unknown) =>
   isRecord(native) && typeof native.reasoning_content === "string" ? native.reasoning_content : undefined
 
+const reasoningField = (part: ReasoningPart) => {
+  const field = part.providerMetadata?.openai?.reasoningField
+  if (field === "reasoning" || field === "reasoning_content" || field === "reasoning_text") return field
+  return "reasoning_content"
+}
+
 const lowerUserMessage = Effect.fn("OpenAIChat.lowerUserMessage")(function* (message: OpenAIChatRequestMessage) {
   const content: Array<Schema.Schema.Type<typeof OpenAIChatUserContent>> = []
   for (const part of message.content) {
@@ -248,14 +259,20 @@ const lowerAssistantMessage = Effect.fn("OpenAIChat.lowerAssistantMessage")(func
       continue
     }
   }
+  const text = reasoning.map((part) => part.text).join("")
+  const field = reasoning[0] ? reasoningField(reasoning[0]) : "reasoning_content"
   return {
     role: "assistant" as const,
     content: content.length === 0 ? null : ProviderShared.joinText(content),
     tool_calls: toolCalls.length === 0 ? undefined : toolCalls,
     reasoning_content:
-      reasoning.length > 0
-        ? reasoning.map((part) => part.text).join("")
-        : openAICompatibleReasoningContent(message.native?.openaiCompatible),
+      reasoning.length === 0
+        ? openAICompatibleReasoningContent(message.native?.openaiCompatible)
+        : field === "reasoning_content"
+          ? text
+          : undefined,
+    reasoning: reasoning.length > 0 && field === "reasoning" ? text : undefined,
+    reasoning_text: reasoning.length > 0 && field === "reasoning_text" ? text : undefined,
   }
 })
 
@@ -400,6 +417,12 @@ const mapUsage = (usage: OpenAIChatEvent["usage"]): Usage | undefined => {
   })
 }
 
+const reasoningDelta = (delta: Schema.Schema.Type<typeof OpenAIChatDelta> | null | undefined) => {
+  if (delta?.reasoning_content) return { field: "reasoning_content", text: delta.reasoning_content } as const
+  if (delta?.reasoning) return { field: "reasoning", text: delta.reasoning } as const
+  if (delta?.reasoning_text) return { field: "reasoning_text", text: delta.reasoning_text } as const
+}
+
 const step = (state: ParserState, event: OpenAIChatEvent) =>
   Effect.gen(function* () {
     const events: LLMEvent[] = []
@@ -412,8 +435,12 @@ const step = (state: ParserState, event: OpenAIChatEvent) =>
 
     let lifecycle = state.lifecycle
 
-    if (delta?.reasoning_content)
-      lifecycle = Lifecycle.reasoningDelta(lifecycle, events, "reasoning-0", delta.reasoning_content)
+    const reasoning = reasoningDelta(delta)
+    const reasoningField = state.reasoningField ?? reasoning?.field
+    if (reasoning)
+      lifecycle = Lifecycle.reasoningDelta(lifecycle, events, "reasoning-0", reasoning.text, {
+        openai: { reasoningField: reasoningField ?? reasoning.field },
+      })
 
     if (delta?.content) {
       lifecycle = Lifecycle.reasoningEnd(lifecycle, events, "reasoning-0")
@@ -450,6 +477,7 @@ const step = (state: ParserState, event: OpenAIChatEvent) =>
         usage,
         finishReason,
         lifecycle,
+        reasoningField,
       },
       events,
     ] as const
@@ -482,7 +510,12 @@ export const protocol = Protocol.make({
   },
   stream: {
     event: Protocol.jsonEvent(OpenAIChatEvent),
-    initial: () => ({ tools: ToolStream.empty<number>(), toolCallEvents: [], lifecycle: Lifecycle.initial() }),
+    initial: () => ({
+      tools: ToolStream.empty<number>(),
+      toolCallEvents: [],
+      lifecycle: Lifecycle.initial(),
+      reasoningField: undefined,
+    }),
     step,
     onHalt: finishEvents,
   },

packages/ai/test/fixtures/recordings/openrouter-reasoning.json

@@ -0,0 +1,34 @@
+{
+  "version": 1,
+  "metadata": {
+    "model": "anthropic/claude-sonnet-4.6",
+    "tags": [
+      "prefix:openai-compatible-chat",
+      "provider:openrouter",
+      "protocol:openai-chat",
+      "reasoning"
+    ],
+    "name": "openrouter-reasoning",
+    "recordedAt": "2026-07-18T11:28:39.267Z"
+  },
+  "interactions": [
+    {
+      "transport": "http",
+      "request": {
+        "method": "POST",
+        "url": "https://openrouter.ai/api/v1/chat/completions",
+        "headers": {
+          "content-type": "application/json"
+        },
+        "body": "{\"model\":\"anthropic/claude-sonnet-4.6\",\"messages\":[{\"role\":\"system\",\"content\":\"Think through the arithmetic, then reply with only the final integer.\"},{\"role\":\"user\",\"content\":\"What is 173 multiplied by 219?\"}],\"stream\":true,\"stream_options\":{\"include_usage\":true},\"max_tokens\":1536,\"temperature\":0,\"reasoning\":{\"max_tokens\":1024}}"
+      },
+      "response": {
+        "status": 200,
+        "headers": {
+          "content-type": "text/event-stream"
+        },
+        "body": ": OPENROUTER PROCESSING\n\n: OPENROUTER PROCESSING\n\ndata: {\"id\":\"gen-1784374117-AXXPsQRoclZeQGx2uHeK\",\"object\":\"chat.completion.chunk\",\"created\":1784374117,\"model\":\"anthropic/claude-sonnet-4.6\",\"provider\":\"Anthropic\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"\",\"role\":\"assistant\",\"reasoning\":\"173\",\"reasoning_details\":[{\"type\":\"reasoning.text\",\"text\":\"173\",\"format\":\"anthropic-claude-v1\",\"index\":0}]},\"finish_reason\":null,\"native_finish_reason\":null}]}\n\n: OPENROUTER PROCESSING\n\ndata: {\"id\":\"gen-1784374117-AXXPsQRoclZeQGx2uHeK\",\"object\":\"chat.completion.chunk\",\"created\":1784374117,\"model\":\"anthropic/claude-sonnet-4.6\",\"provider\":\"Anthropic\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"\",\"role\":\"assistant\",\"reasoning\":\" × 219\\n\\n173 × 200 = 34,600\\n173 × 19 = 173 × 20 - 173 = 3,460 - 173 = 3,287\",\"reasoning_details\":[{\"type\":\"reasoning.text\",\"text\":\" × 219\\n\\n173 × 200 = 34,600\\n173 × 19 = 173 × 20 - 173 = 3,460 - 173 = 3,287\",\"format\":\"anthropic-claude-v1\",\"index\":0}]},\"finish_reason\":null,\"native_finish_reason\":null}]}\n\ndata: {\"id\":\"gen-1784374117-AXXPsQRoclZeQGx2uHeK\",\"object\":\"chat.completion.chunk\",\"created\":1784374117,\"model\":\"anthropic/claude-sonnet-4.6\",\"provider\":\"Anthropic\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"\",\"role\":\"assistant\",\"reasoning\":\"\\n\\n34,600 + 3,287 = 37,887\",\"reasoning_details\":[{\"type\":\"reasoning.text\",\"text\":\"\\n\\n34,600 + 3,287 = 37,887\",\"format\":\"anthropic-claude-v1\",\"index\":0}]},\"finish_reason\":null,\"native_finish_reason\":null}]}\n\ndata: {\"id\":\"gen-1784374117-AXXPsQRoclZeQGx2uHeK\",\"object\":\"chat.completion.chunk\",\"created\":1784374117,\"model\":\"anthropic/claude-sonnet-4.6\",\"provider\":\"Anthropic\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"\",\"role\":\"assistant\",\"reasoning_details\":[{\"type\":\"reasoning.text\",\"signature\":\"EtgCCosBCA8YAipA0W4viH3kgBs43Cl5ewwVBPXTQElvzfbA2TLF4iSbKy9ZZDCSDjjAlF3Bs4ELEnP3vrrTuTioC6OB380lXQdyIDIRY2xhdWRlLXNvbm5ldC00LTY4AEIIdGhpbmtpbmdaJDRjMGYwNDZmLTI1ZmQtNDVmYi1iZmIzLWEwOGE4ZTI0OWNhNxIMMiUlJC3x/5p5PuTwGgwlc8eipZyoM94BHwMiMO45uQx/ymeOjbugi7RDVPZ4jZXSIiEbVi2CD7zPjAK5fFQoVGP1HD55v9CER823JCp6Dg5Xb7Lrk6NUd1XN2KTKrttK7mATE+IBrDTFmor/1cNeg+9gjIbxM/jn/6L5HPmh3/esEVu24Q0IGLZVoE7cTgGgxsrceKMD71Jp2XQgIWD8ltsPfWw3gSc4p+z18UuPN6LuR0mHHENTnClHrAPnOrxbDIl4ZwZgMX8YAQ==\",\"format\":\"anthropic-claude-v1\",\"index\":0}]},\"finish_reason\":null,\"native_finish_reason\":null}]}\n\ndata: {\"id\":\"gen-1784374117-AXXPsQRoclZeQGx2uHeK\",\"object\":\"chat.completion.chunk\",\"created\":1784374117,\"model\":\"anthropic/claude-sonnet-4.6\",\"provider\":\"Anthropic\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"37887\",\"role\":\"assistant\"},\"finish_reason\":null,\"native_finish_reason\":null}]}\n\ndata: {\"id\":\"gen-1784374117-AXXPsQRoclZeQGx2uHeK\",\"object\":\"chat.completion.chunk\",\"created\":1784374117,\"model\":\"anthropic/claude-sonnet-4.6\",\"provider\":\"Anthropic\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"\",\"role\":\"assistant\",\"reasoning\":null},\"finish_reason\":\"stop\",\"native_finish_reason\":\"end_turn\"}]}\n\ndata: {\"id\":\"gen-1784374117-AXXPsQRoclZeQGx2uHeK\",\"object\":\"chat.completion.chunk\",\"created\":1784374117,\"model\":\"anthropic/claude-sonnet-4.6\",\"provider\":\"Anthropic\",\"service_tier\":\"default\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"\",\"role\":\"assistant\"},\"finish_reason\":\"stop\",\"native_finish_reason\":\"end_turn\"}],\"usage\":{\"prompt_tokens\":61,\"completion_tokens\":80,\"total_tokens\":141,\"cost\":0.001383,\"is_byok\":false,\"prompt_tokens_details\":{\"cached_tokens\":0,\"cache_write_tokens\":0,\"audio_tokens\":0,\"video_tokens\":0},\"cache_creation\":{\"ephemeral_5m_input_tokens\":0,\"ephemeral_1h_input_tokens\":0},\"cost_details\":{\"upstream_inference_cost\":0.001383,\"upstream_inference_prompt_cost\":0.000183,\"upstream_inference_completions_cost\":0.0012},\"completion_tokens_details\":{\"reasoning_tokens\":29,\"image_tokens\":0,\"audio_tokens\":0}}}\n\ndata: [DONE]\n\n"
+      }
+    }
+  ]
+}

packages/ai/test/fixtures/recordings/vercel-ai-gateway-reasoning.json

@@ -0,0 +1,34 @@
+{
+  "version": 1,
+  "metadata": {
+    "model": "anthropic/claude-sonnet-4.6",
+    "tags": [
+      "prefix:openai-compatible-chat",
+      "provider:vercel-ai-gateway",
+      "protocol:openai-chat",
+      "reasoning"
+    ],
+    "name": "vercel-ai-gateway-reasoning",
+    "recordedAt": "2026-07-18T11:28:42.077Z"
+  },
+  "interactions": [
+    {
+      "transport": "http",
+      "request": {
+        "method": "POST",
+        "url": "https://ai-gateway.vercel.sh/v1/chat/completions",
+        "headers": {
+          "content-type": "application/json"
+        },
+        "body": "{\"model\":\"anthropic/claude-sonnet-4.6\",\"messages\":[{\"role\":\"system\",\"content\":\"Think through the arithmetic, then reply with only the final integer.\"},{\"role\":\"user\",\"content\":\"What is 173 multiplied by 219?\"}],\"stream\":true,\"stream_options\":{\"include_usage\":true},\"max_tokens\":1536,\"temperature\":0,\"reasoning\":{\"enabled\":true,\"max_tokens\":1024}}"
+      },
+      "response": {
+        "status": 200,
+        "headers": {
+          "content-type": "text/event-stream"
+        },
+        "body": "data: {\"id\":\"gen_01KXTFRJXJ8CKP0W3DKC3WC004\",\"object\":\"chat.completion.chunk\",\"created\":1784374121,\"model\":\"anthropic/claude-sonnet-4.6\",\"choices\":[{\"index\":0,\"delta\":{\"role\":\"assistant\"},\"logprobs\":null,\"finish_reason\":null}],\"system_fingerprint\":\"fp_zfth1fcyet\"}\n\ndata: {\"id\":\"gen_01KXTFRJXJ8CKP0W3DKC3WC004\",\"object\":\"chat.completion.chunk\",\"created\":1784374121,\"model\":\"anthropic/claude-sonnet-4.6\",\"choices\":[{\"index\":0,\"delta\":{\"reasoning\":\"173\",\"reasoning_details\":[{\"type\":\"reasoning.text\",\"text\":\"173\",\"signature\":\"\",\"format\":\"anthropic-claude-v1\",\"index\":0}]},\"logprobs\":null,\"finish_reason\":null}],\"system_fingerprint\":\"fp_zfth1fcyet\"}\n\ndata: {\"id\":\"gen_01KXTFRJXJ8CKP0W3DKC3WC004\",\"object\":\"chat.completion.chunk\",\"created\":1784374121,\"model\":\"anthropic/claude-sonnet-4.6\",\"choices\":[{\"index\":0,\"delta\":{\"reasoning\":\" × 219\\n\\n173 × 200 = 34,600\\n173 × 19 = 173 × 20 - 173 = 3,460\",\"reasoning_details\":[{\"type\":\"reasoning.text\",\"text\":\" × 219\\n\\n173 × 200 = 34,600\\n173 × 19 = 173 × 20 - 173 = 3,460\",\"signature\":\"\",\"format\":\"anthropic-claude-v1\",\"index\":0}]},\"logprobs\":null,\"finish_reason\":null}],\"system_fingerprint\":\"fp_zfth1fcyet\"}\n\ndata: {\"id\":\"gen_01KXTFRJXJ8CKP0W3DKC3WC004\",\"object\":\"chat.completion.chunk\",\"created\":1784374121,\"model\":\"anthropic/claude-sonnet-4.6\",\"choices\":[{\"index\":0,\"delta\":{\"reasoning\":\" - 173 = 3,287\\n\\n34,600 + 3,287 = 37,887\",\"reasoning_details\":[{\"type\":\"reasoning.text\",\"text\":\" - 173 = 3,287\\n\\n34,600 + 3,287 = 37,887\",\"signature\":\"\",\"format\":\"anthropic-claude-v1\",\"index\":0}]},\"logprobs\":null,\"finish_reason\":null}],\"system_fingerprint\":\"fp_zfth1fcyet\"}\n\ndata: {\"id\":\"gen_01KXTFRJXJ8CKP0W3DKC3WC004\",\"object\":\"chat.completion.chunk\",\"created\":1784374121,\"model\":\"anthropic/claude-sonnet-4.6\",\"choices\":[{\"index\":0,\"delta\":{\"reasoning\":\"\",\"reasoning_details\":[{\"type\":\"reasoning.text\",\"text\":\"\",\"signature\":\"EtgCCosBCA8YAipA0W4viH3kgBs43Cl5ewwVBPXTQElvzfbA2TLF4iSbKy9ZZDCSDjjAlF3Bs4ELEnP3vrrTuTioC6OB380lXQdyIDIRY2xhdWRlLXNvbm5ldC00LTY4AEIIdGhpbmtpbmdaJDNiOTNhNWRkLTczMDItNDgzZi1hZWFlLTM2MjA3NTU0OGFlMRIMKkQaBkOSYB8cgQNiGgwDinVmv/KYSAKQEsUiMPSSFWvVpNuyEyYC8HlxrEZsb5KEEETuMjAI2hcC3m/NwGR+PC7chh2JWwD7wyK+eyp6OoF973UNMHAsWsKykCSJv60aXeOiDomxdfR9CRWVtaroVTkhtL2FPgplBPZYr75XvS0l6If3fqCPKevNE5WaOsSaXNfnMCCKGX7A0Pkhs4NazmCnntWGOsW7J03bAQKzIZ+c+Yr0rSwmwvuiocDqzsSE8bOeVv4352EYAQ==\",\"format\":\"anthropic-claude-v1\",\"index\":0}]},\"logprobs\":null,\"finish_reason\":null}],\"system_fingerprint\":\"fp_zfth1fcyet\"}\n\ndata: {\"id\":\"gen_01KXTFRJXJ8CKP0W3DKC3WC004\",\"object\":\"chat.completion.chunk\",\"created\":1784374121,\"model\":\"anthropic/claude-sonnet-4.6\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"37,887\"},\"logprobs\":null,\"finish_reason\":null}],\"system_fingerprint\":\"fp_zfth1fcyet\"}\n\ndata: {\"id\":\"gen_01KXTFRJXJ8CKP0W3DKC3WC004\",\"object\":\"chat.completion.chunk\",\"created\":1784374121,\"model\":\"anthropic/claude-sonnet-4.6\",\"choices\":[{\"index\":0,\"delta\":{\"provider_metadata\":{\"anthropic\":{\"usage\":{\"input_tokens\":61,\"cache_creation_input_tokens\":0,\"cache_read_input_tokens\":0,\"cache_creation\":{\"ephemeral_5m_input_tokens\":0,\"ephemeral_1h_input_tokens\":0},\"output_tokens\":81,\"service_tier\":\"standard\",\"inference_geo\":\"global\",\"output_tokens_details\":{\"thinking_tokens\":73}},\"cacheCreationInputTokens\":0,\"stopSequence\":null,\"iterations\":null,\"container\":null,\"contextManagement\":null},\"gateway\":{\"routing\":{\"originalModelId\":\"anthropic/claude-sonnet-4.6\",\"resolvedProvider\":\"anthropic\",\"fallbacksAvailable\":[\"vertexAnthropic\",\"bedrock\"],\"planningReasoning\":\"System credentials planned for: anthropic, vertexAnthropic, bedrock. Total execution order: anthropic(system) → vertexAnthropic(system) → bedrock(system)\",\"canonicalSlug\":\"anthropic/claude-sonnet-4.6\",\"finalProvider\":\"anthropic\",\"modelAttemptCount\":1,\"modelAttempts\":[{\"canonicalSlug\":\"anthropic/claude-sonnet-4.6\",\"success\":true,\"providerAttemptCount\":1,\"providerAttempts\":[{\"provider\":\"anthropic\",\"credentialType\":\"system\",\"success\":true,\"startTime\":1784374119500,\"endTime\":1784374122066,\"providerRequestId\":\"req_011Cd9SjHykKUqTQ1S8cAG17\",\"statusCode\":200,\"providerResponseId\":\"msg_011Cd9SjLvMmTFY8Pyj8n336\"}]}],\"totalProviderAttemptCount\":1},\"cost\":\"0.001398\",\"marketCost\":\"0.001398\",\"surchargeCost\":\"0\",\"gatewayCost\":\"0.001398\",\"inferenceCost\":\"0.001398\",\"inputInferenceCost\":\"0.000183\",\"outputInferenceCost\":\"0.001215\",\"generationId\":\"gen_01KXTFRJXJ8CKP0W3DKC3WC004\"}}},\"logprobs\":null,\"finish_reason\":\"stop\"}],\"usage\":{\"prompt_tokens\":61,\"completion_tokens\":81,\"total_tokens\":142,\"cost\":0.001398,\"is_byok\":false,\"prompt_tokens_details\":{\"cached_tokens\":0,\"audio_tokens\":0,\"video_tokens\":0},\"cost_details\":{\"upstream_inference_cost\":null,\"upstream_inference_prompt_cost\":0,\"upstream_inference_completions_cost\":0},\"completion_tokens_details\":{\"reasoning_tokens\":26,\"reasoning_tokens_estimated\":true,\"image_tokens\":0},\"cache_creation_input_tokens\":0,\"market_cost\":0.001398,\"gateway_cost\":0.001398},\"system_fingerprint\":\"fp_zfth1fcyet\",\"generationId\":\"gen_01KXTFRJXJ8CKP0W3DKC3WC004\"}\n\ndata: [DONE]\n\n"
+      }
+    }
+  ]
+}

packages/ai/test/provider/openai-chat-reasoning.recorded.test.ts

@@ -0,0 +1,67 @@
+import { describe, expect } from "bun:test"
+import { Effect } from "effect"
+import { LLM, LLMEvent } from "../../src"
+import * as OpenAICompatible from "../../src/providers/openai-compatible"
+import * as OpenRouter from "../../src/providers/openrouter"
+import { LLMClient } from "../../src/route"
+import { recordedTests } from "../recorded-test"
+
+const cases = [
+  {
+    name: "OpenRouter",
+    model: OpenRouter.configure({
+      apiKey: process.env.OPENROUTER_API_KEY ?? "fixture",
+      providerOptions: { openrouter: { reasoning: { max_tokens: 1024 } } },
+    }).model("anthropic/claude-sonnet-4.6"),
+    requires: ["OPENROUTER_API_KEY"],
+    cassette: "openrouter-reasoning",
+  },
+  {
+    name: "Vercel AI Gateway",
+    model: OpenAICompatible.configure({
+      provider: "vercel-ai-gateway",
+      baseURL: "https://ai-gateway.vercel.sh/v1",
+      apiKey: process.env.AI_GATEWAY_API_KEY ?? "fixture",
+      http: { body: { reasoning: { enabled: true, max_tokens: 1024 } } },
+    }).model("anthropic/claude-sonnet-4.6"),
+    requires: ["AI_GATEWAY_API_KEY"],
+    cassette: "vercel-ai-gateway-reasoning",
+  },
+] as const
+
+for (const item of cases) {
+  const recorded = recordedTests({
+    prefix: "openai-compatible-chat",
+    provider: item.model.provider,
+    protocol: "openai-chat",
+    requires: item.requires,
+    tags: ["reasoning"],
+    metadata: { model: item.model.id },
+  })
+
+  describe(`${item.name} reasoning recorded`, () => {
+    recorded.effect.with(
+      "streams scalar reasoning",
+      { cassette: item.cassette },
+      () =>
+        Effect.gen(function* () {
+          const response = yield* LLMClient.generate(
+            LLM.request({
+              model: item.model,
+              system: "Think through the arithmetic, then reply with only the final integer.",
+              prompt: "What is 173 multiplied by 219?",
+              generation: { maxTokens: 1536, temperature: 0 },
+            }),
+          )
+
+          expect(response.text.replaceAll(",", "").trim()).toBe("37887")
+          expect(response.reasoning.length).toBeGreaterThan(0)
+          expect(response.events.some(LLMEvent.is.reasoningDelta)).toBe(true)
+          expect(response.message.content.find((part) => part.type === "reasoning")?.providerMetadata).toEqual({
+            openai: { reasoningField: "reasoning" },
+          })
+        }),
+      30_000,
+    )
+  })
+}