fix(provider): widen interleaved reasoning fields (#39556)

Co-authored-by: Aiden Cline <rekram1-node@users.noreply.github.com>

packages/core/src/models-dev.ts

@@ -15,6 +15,11 @@ import { httpClient } from "./effect/app-node-platform"
 export const CatalogModelStatus = Schema.Literals(["alpha", "beta", "deprecated"])
 export type CatalogModelStatus = typeof CatalogModelStatus.Type
 
+const InterleavedField = Schema.Union([
+  Schema.Literals(["reasoning", "reasoning_content", "reasoning_text"]),
+  Schema.String,
+])
+
 const USER_AGENT = `opencode/${InstallationChannel}/${InstallationVersion}/${Flag.OPENCODE_CLIENT}`
 
 const CostTier = Schema.Struct({
@@ -71,9 +76,10 @@ export const Model = Schema.Struct({
   reasoning_options: Schema.optional(Schema.Array(ReasoningOption)),
   interleaved: Schema.optional(
     Schema.Union([
-      Schema.Literal(true),
+      Schema.Boolean,
+      InterleavedField,
       Schema.Struct({
-        field: Schema.Literals(["reasoning", "reasoning_content", "reasoning_details"]),
+        field: InterleavedField,
       }),
     ]),
   ),

packages/core/src/v1/config/provider.ts

@@ -5,6 +5,11 @@ import { PositiveInt } from "../../schema"
 
 export const ModelStatus = Schema.Literals(["alpha", "beta", "deprecated", "active"])
 
+const InterleavedField = Schema.Union([
+  Schema.Literals(["reasoning", "reasoning_content", "reasoning_text"]),
+  Schema.String,
+])
+
 export const Model = Schema.Struct({
   id: Schema.optional(Schema.String),
   name: Schema.optional(Schema.String),
@@ -16,9 +21,10 @@ export const Model = Schema.Struct({
   tool_call: Schema.optional(Schema.Boolean),
   interleaved: Schema.optional(
     Schema.Union([
-      Schema.Literal(true),
+      Schema.Boolean,
+      InterleavedField,
       Schema.Struct({
-        field: Schema.Literals(["reasoning", "reasoning_content", "reasoning_details"]),
+        field: InterleavedField,
       }),
     ]),
   ),

packages/opencode/src/provider/provider.ts

@@ -976,10 +976,15 @@ const ProviderModalities = Schema.Struct({
   pdf: Schema.Boolean,
 })
 
+const ProviderInterleavedField = Schema.Union([
+  Schema.Literals(["reasoning", "reasoning_content", "reasoning_text"]),
+  Schema.String,
+])
+
 const ProviderInterleaved = Schema.Union([
   Schema.Boolean,
   Schema.Struct({
-    field: Schema.Literals(["reasoning", "reasoning_content", "reasoning_details"]),
+    field: ProviderInterleavedField,
   }),
 ])
 
@@ -1243,7 +1248,7 @@ function fromModelsDevModel(provider: ModelsDev.Provider, model: ModelsDev.Model
         video: model.modalities?.output?.includes("video") ?? false,
         pdf: model.modalities?.output?.includes("pdf") ?? false,
       },
-      interleaved: model.interleaved ?? false,
+      interleaved: typeof model.interleaved === "string" ? { field: model.interleaved } : (model.interleaved ?? false),
     },
     release_date: model.release_date ?? "",
     variants: {},
@@ -1475,7 +1480,7 @@ const layer = Layer.effect(
                   pdf: model.modalities?.output?.includes("pdf") ?? existingModel?.capabilities.output.pdf ?? false,
                 },
                 interleaved:
-                  model.interleaved ??
+                  (typeof model.interleaved === "string" ? { field: model.interleaved } : model.interleaved) ??
                   existingModel?.capabilities.interleaved ??
                   (!existingModel && apiNpm === "@ai-sdk/openai-compatible" && apiID.includes("deepseek")
                     ? { field: "reasoning_content" }

packages/opencode/test/provider/provider.test.ts

@@ -252,6 +252,8 @@ it.instance(
     const provider = providers[ProviderV2.ID.make("custom-provider")]
     expect(provider.models["deepseek-r1"].capabilities.interleaved).toEqual({ field: "reasoning_content" })
     expect(provider.models["deepseek-details"].capabilities.interleaved).toEqual({ field: "reasoning_details" })
+    expect(provider.models["deepseek-text"].capabilities.interleaved).toEqual({ field: "reasoning_text" })
+    expect(provider.models["custom-reasoning"].capabilities.interleaved).toEqual({ field: "vendor_reasoning" })
     expect(provider.models["custom-model"].capabilities.interleaved).toBe(false)
     expect(
       providers[ProviderV2.ID.make("custom-anthropic-provider")].models["deepseek-r1"].capabilities.interleaved,
@@ -267,6 +269,8 @@ it.instance(
           models: {
             "deepseek-r1": { name: "DeepSeek R1" },
             "deepseek-details": { name: "DeepSeek Details", interleaved: { field: "reasoning_details" } },
+            "deepseek-text": { name: "DeepSeek Text", interleaved: "reasoning_text" },
+            "custom-reasoning": { name: "Custom Reasoning", interleaved: { field: "vendor_reasoning" } },
             "custom-model": { name: "Custom Model" },
           },
           options: { apiKey: "custom-key" },
@@ -1462,6 +1466,7 @@ test("models.dev normalization fills required response fields", () => {
         id: "gpt-5.4",
         name: "GPT-5.4",
         family: "gpt",
+        interleaved: "reasoning_text",
         cost: { input: 2.5, output: 15 },
         limit: { context: 1_050_000, input: 922_000, output: 128_000 },
       },
@@ -1474,6 +1479,7 @@ test("models.dev normalization fills required response fields", () => {
   expect(model.capabilities.reasoning).toBe(false)
   expect(model.capabilities.attachment).toBe(false)
   expect(model.capabilities.toolcall).toBe(true)
+  expect(model.capabilities.interleaved).toEqual({ field: "reasoning_text" })
   expect(model.release_date).toBe("")
 })
 

packages/sdk/js/src/v2/gen/types.gen.ts

@@ -1768,9 +1768,13 @@ export type ProviderConfig = {
       temperature?: boolean
       tool_call?: boolean
       interleaved?:
-        | true
+        | boolean
+        | "reasoning"
+        | "reasoning_content"
+        | "reasoning_text"
+        | string
         | {
-            field: "reasoning" | "reasoning_content" | "reasoning_details"
+            field: "reasoning" | "reasoning_content" | "reasoning_text" | string
           }
       cost?: {
         input: number
@@ -2057,7 +2061,7 @@ export type Model = {
     interleaved:
       | boolean
       | {
-          field: "reasoning" | "reasoning_content" | "reasoning_details"
+          field: "reasoning" | "reasoning_content" | "reasoning_text" | string
         }
   }
   cost: {

packages/sdk/openapi.json

@@ -20820,15 +20820,28 @@
                 "interleaved": {
                   "anyOf": [
                     {
-                      "type": "boolean",
-                      "enum": [true]
+                      "type": "boolean"
+                    },
+                    {
+                      "type": "string",
+                      "enum": ["reasoning", "reasoning_content", "reasoning_text"]
+                    },
+                    {
+                      "type": "string"
                     },
                     {
                       "type": "object",
                       "properties": {
                         "field": {
-                          "type": "string",
-                          "enum": ["reasoning", "reasoning_content", "reasoning_details"]
+                          "anyOf": [
+                            {
+                              "type": "string",
+                              "enum": ["reasoning", "reasoning_content", "reasoning_text"]
+                            },
+                            {
+                              "type": "string"
+                            }
+                          ]
                         }
                       },
                       "required": ["field"],
@@ -21641,8 +21654,15 @@
                     "type": "object",
                     "properties": {
                       "field": {
-                        "type": "string",
-                        "enum": ["reasoning", "reasoning_content", "reasoning_details"]
+                        "anyOf": [
+                          {
+                            "type": "string",
+                            "enum": ["reasoning", "reasoning_content", "reasoning_text"]
+                          },
+                          {
+                            "type": "string"
+                          }
+                        ]
                       }
                     },
                     "required": ["field"],