diff --git a/packages/opencode/src/config/config.ts b/packages/opencode/src/config/config.ts
index 3cae1af4bd..b41e5d71c2 100644
--- a/packages/opencode/src/config/config.ts
+++ b/packages/opencode/src/config/config.ts
@@ -730,28 +730,77 @@ export namespace Config {
   })
   export type Layout = z.infer<typeof Layout>
 
+  export const Model = z
+    .object({
+      id: z.string(),
+      name: z.string(),
+      family: z.string().optional(),
+      release_date: z.string(),
+      attachment: z.boolean(),
+      reasoning: z.boolean(),
+      temperature: z.boolean(),
+      tool_call: z.boolean(),
+      interleaved: z
+        .union([
+          z.literal(true),
+          z
+            .object({
+              field: z.enum(["reasoning_content", "reasoning_details"]),
+            })
+            .strict(),
+        ])
+        .optional(),
+      cost: z
+        .object({
+          input: z.number(),
+          output: z.number(),
+          cache_read: z.number().optional(),
+          cache_write: z.number().optional(),
+          context_over_200k: z
+            .object({
+              input: z.number(),
+              output: z.number(),
+              cache_read: z.number().optional(),
+              cache_write: z.number().optional(),
+            })
+            .optional(),
+        })
+        .optional(),
+      limit: z.object({
+        context: z.number(),
+        input: z.number().optional(),
+        output: z.number(),
+      }),
+      modalities: z
+        .object({
+          input: z.array(z.enum(["text", "audio", "image", "video", "pdf"])),
+          output: z.array(z.enum(["text", "audio", "image", "video", "pdf"])),
+        })
+        .optional(),
+      experimental: z.boolean().optional(),
+      status: z.enum(["alpha", "beta", "deprecated"]).optional(),
+      options: z.record(z.string(), z.any()),
+      headers: z.record(z.string(), z.string()).optional(),
+      provider: z.object({ npm: z.string().optional(), api: z.string().optional() }).optional(),
+      variants: z
+        .record(
+          z.string(),
+          z
+            .object({
+              disabled: z.boolean().optional().describe("Disable this variant for the model"),
+            })
+            .catchall(z.any()),
+        )
+        .optional()
+        .describe("Variant-specific configuration"),
+    })
+    .partial()
+
   export const Provider = ModelsDev.Provider.partial()
     .extend({
       whitelist: z.array(z.string()).optional(),
       blacklist: z.array(z.string()).optional(),
-      models: z
-        .record(
-          z.string(),
-          ModelsDev.Model.partial().extend({
-            variants: z
-              .record(
-                z.string(),
-                z
-                  .object({
-                    disabled: z.boolean().optional().describe("Disable this variant for the model"),
-                  })
-                  .catchall(z.any()),
-              )
-              .optional()
-              .describe("Variant-specific configuration"),
-          }),
-        )
-        .optional(),
+      models: z.record(z.string(), Model).optional(),
       options: z
         .object({
           apiKey: z.string().optional(),
diff --git a/packages/opencode/src/provider/models.ts b/packages/opencode/src/provider/models.ts
index 30901ea74f..0e2a26b4d9 100644
--- a/packages/opencode/src/provider/models.ts
+++ b/packages/opencode/src/provider/models.ts
@@ -61,12 +61,8 @@ export namespace ModelsDev {
         output: z.array(z.enum(["text", "audio", "image", "video", "pdf"])),
       })
       .optional(),
-    experimental: z.boolean().optional(),
     status: z.enum(["alpha", "beta", "deprecated"]).optional(),
-    options: z.record(z.string(), z.any()),
-    headers: z.record(z.string(), z.string()).optional(),
     provider: z.object({ npm: z.string().optional(), api: z.string().optional() }).optional(),
-    variants: z.record(z.string(), z.record(z.string(), z.any())).optional(),
   })
   export type Model = z.infer<typeof Model>
 
diff --git a/packages/opencode/src/provider/provider.ts b/packages/opencode/src/provider/provider.ts
index c3ca1b3852..a77ed1d8fe 100644
--- a/packages/opencode/src/provider/provider.ts
+++ b/packages/opencode/src/provider/provider.ts
@@ -909,8 +909,8 @@ export namespace Provider {
         npm: model.provider?.npm ?? provider.npm ?? "@ai-sdk/openai-compatible",
       },
       status: model.status ?? "active",
-      headers: model.headers ?? {},
-      options: model.options ?? {},
+      headers: {},
+      options: {},
       cost: {
         input: model.cost?.input ?? 0,
         output: model.cost?.output ?? 0,
diff --git a/packages/opencode/src/session/llm.ts b/packages/opencode/src/session/llm.ts
index dc89db409e..41f72df06a 100644
--- a/packages/opencode/src/session/llm.ts
+++ b/packages/opencode/src/session/llm.ts
@@ -1,7 +1,6 @@
 import { Provider } from "@/provider/provider"
 import { Log } from "@/util/log"
-import { Cause, Effect, Layer, Record, ServiceMap } from "effect"
-import * as Queue from "effect/Queue"
+import { Effect, Layer, Record, ServiceMap } from "effect"
 import * as Stream from "effect/Stream"
 import { streamText, wrapLanguageModel, type ModelMessage, type Tool, tool, jsonSchema } from "ai"
 import { mergeDeep, pipe } from "remeda"
diff --git a/packages/opencode/src/session/prompt.ts b/packages/opencode/src/session/prompt.ts
index 436847ed4e..5121f24527 100644
--- a/packages/opencode/src/session/prompt.ts
+++ b/packages/opencode/src/session/prompt.ts
@@ -756,7 +756,7 @@ NOTE: At any point in time through this workflow you should feel free to ask the
         }
         const model = input.model ?? agent.model ?? (yield* lastModel(input.sessionID))
         const userMsg: MessageV2.User = {
-          id: MessageID.ascending(),
+          id: input.messageID ?? MessageID.ascending(),
           sessionID: input.sessionID,
           time: { created: Date.now() },
           role: "user",
@@ -1827,6 +1827,7 @@ NOTE: At any point in time through this workflow you should feel free to ask the
 
   export const ShellInput = z.object({
     sessionID: SessionID.zod,
+    messageID: MessageID.zod.optional(),
     agent: z.string(),
     model: z
       .object({
diff --git a/packages/sdk/js/src/v2/gen/sdk.gen.ts b/packages/sdk/js/src/v2/gen/sdk.gen.ts
index 527584e7e2..113b3ed0f8 100644
--- a/packages/sdk/js/src/v2/gen/sdk.gen.ts
+++ b/packages/sdk/js/src/v2/gen/sdk.gen.ts
@@ -2231,6 +2231,7 @@ export class Session2 extends HeyApiClient {
       sessionID: string
       directory?: string
       workspace?: string
+      messageID?: string
       agent?: string
       model?: {
         providerID: string
@@ -2248,6 +2249,7 @@ export class Session2 extends HeyApiClient {
             { in: "path", key: "sessionID" },
             { in: "query", key: "directory" },
             { in: "query", key: "workspace" },
+            { in: "body", key: "messageID" },
             { in: "body", key: "agent" },
             { in: "body", key: "model" },
             { in: "body", key: "command" },
diff --git a/packages/sdk/js/src/v2/gen/types.gen.ts b/packages/sdk/js/src/v2/gen/types.gen.ts
index 290c6fd5ec..6ac6af1439 100644
--- a/packages/sdk/js/src/v2/gen/types.gen.ts
+++ b/packages/sdk/js/src/v2/gen/types.gen.ts
@@ -3815,6 +3815,7 @@ export type SessionCommandResponse = SessionCommandResponses[keyof SessionComman
 
 export type SessionShellData = {
   body?: {
+    messageID?: string
     agent: string
     model?: {
       providerID: string
@@ -4167,23 +4168,11 @@ export type ProviderListResponses = {
             input: Array<"text" | "audio" | "image" | "video" | "pdf">
             output: Array<"text" | "audio" | "image" | "video" | "pdf">
           }
-          experimental?: boolean
           status?: "alpha" | "beta" | "deprecated"
-          options: {
-            [key: string]: unknown
-          }
-          headers?: {
-            [key: string]: string
-          }
           provider?: {
             npm?: string
             api?: string
           }
-          variants?: {
-            [key: string]: {
-              [key: string]: unknown
-            }
-          }
         }
       }
     }>
diff --git a/packages/sdk/openapi.json b/packages/sdk/openapi.json
index ba7188af13..549fcc4fe1 100644
--- a/packages/sdk/openapi.json
+++ b/packages/sdk/openapi.json
@@ -3942,6 +3942,10 @@
               "schema": {
                 "type": "object",
                 "properties": {
+                  "messageID": {
+                    "type": "string",
+                    "pattern": "^msg.*"
+                  },
                   "agent": {
                     "type": "string"
                   },
@@ -4740,29 +4744,10 @@
                                   },
                                   "required": ["input", "output"]
                                 },
-                                "experimental": {
-                                  "type": "boolean"
-                                },
                                 "status": {
                                   "type": "string",
                                   "enum": ["alpha", "beta", "deprecated"]
                                 },
-                                "options": {
-                                  "type": "object",
-                                  "propertyNames": {
-                                    "type": "string"
-                                  },
-                                  "additionalProperties": {}
-                                },
-                                "headers": {
-                                  "type": "object",
-                                  "propertyNames": {
-                                    "type": "string"
-                                  },
-                                  "additionalProperties": {
-                                    "type": "string"
-                                  }
-                                },
                                 "provider": {
                                   "type": "object",
                                   "properties": {
@@ -4773,19 +4758,6 @@
                                       "type": "string"
                                     }
                                   }
-                                },
-                                "variants": {
-                                  "type": "object",
-                                  "propertyNames": {
-                                    "type": "string"
-                                  },
-                                  "additionalProperties": {
-                                    "type": "object",
-                                    "propertyNames": {
-                                      "type": "string"
-                                    },
-                                    "additionalProperties": {}
-                                  }
                                 }
                               },
                               "required": [
@@ -4796,8 +4768,7 @@
                                 "reasoning",
                                 "temperature",
                                 "tool_call",
-                                "limit",
-                                "options"
+                                "limit"
                               ]
                             }
                           }