diff --git a/apps/server/src/git/Layers/CodexTextGeneration.ts b/apps/server/src/git/Layers/CodexTextGeneration.ts
index 9a8d1d93f0..6a8e79340c 100644
--- a/apps/server/src/git/Layers/CodexTextGeneration.ts
+++ b/apps/server/src/git/Layers/CodexTextGeneration.ts
@@ -17,7 +17,7 @@ import {
   TextGeneration,
 } from "../Services/TextGeneration.ts";
 
-const CODEX_MODEL = "gpt-5.3-codex";
+const DEFAULT_CODEX_MODEL = "gpt-5.3-codex";
 const CODEX_REASONING_EFFORT = "low";
 const CODEX_TIMEOUT_MS = 180_000;
 
@@ -187,6 +187,7 @@ const makeCodexTextGeneration = Effect.gen(function* () {
     outputSchemaJson,
     imagePaths = [],
     cleanupPaths = [],
+    model,
   }: {
     operation: "generateCommitMessage" | "generatePrContent" | "generateBranchName";
     cwd: string;
@@ -194,6 +195,7 @@ const makeCodexTextGeneration = Effect.gen(function* () {
     outputSchemaJson: S;
     imagePaths?: ReadonlyArray<string>;
     cleanupPaths?: ReadonlyArray<string>;
+    model?: string;
   }): Effect.Effect<S["Type"], TextGenerationError, S["DecodingServices"]> =>
     Effect.gen(function* () {
       const schemaPath = yield* writeTempFile(
@@ -212,7 +214,7 @@ const makeCodexTextGeneration = Effect.gen(function* () {
             "-s",
             "read-only",
             "--model",
-            CODEX_MODEL,
+            model ?? DEFAULT_CODEX_MODEL,
             "--config",
             `model_reasoning_effort="${CODEX_REASONING_EFFORT}"`,
             "--output-schema",
@@ -353,6 +355,7 @@ const makeCodexTextGeneration = Effect.gen(function* () {
       cwd: input.cwd,
       prompt,
       outputSchemaJson,
+      ...(input.model ? { model: input.model } : {}),
     }).pipe(
       Effect.map(
         (generated) =>
@@ -398,6 +401,7 @@ const makeCodexTextGeneration = Effect.gen(function* () {
         title: Schema.String,
         body: Schema.String,
       }),
+      ...(input.model ? { model: input.model } : {}),
     }).pipe(
       Effect.map(
         (generated) =>
@@ -449,6 +453,7 @@ const makeCodexTextGeneration = Effect.gen(function* () {
           branch: Schema.String,
         }),
         imagePaths,
+        ...(input.model ? { model: input.model } : {}),
       });
 
       return {
diff --git a/apps/server/src/git/Layers/GitManager.ts b/apps/server/src/git/Layers/GitManager.ts
index 8357795173..84a07102a0 100644
--- a/apps/server/src/git/Layers/GitManager.ts
+++ b/apps/server/src/git/Layers/GitManager.ts
@@ -639,6 +639,8 @@ export const makeGitManager = Effect.gen(function* () {
     /** When true, also produce a semantic feature branch name. */
     includeBranch?: boolean;
     filePaths?: readonly string[];
+    /** Optional model to use for commit message generation. */
+    model?: string;
   }) =>
     Effect.gen(function* () {
       const context = yield* gitCore.prepareCommitContext(input.cwd, input.filePaths);
@@ -665,6 +667,7 @@ export const makeGitManager = Effect.gen(function* () {
           stagedSummary: limitContext(context.stagedSummary, 8_000),
           stagedPatch: limitContext(context.stagedPatch, 50_000),
           ...(input.includeBranch ? { includeBranch: true } : {}),
+          ...(input.model ? { model: input.model } : {}),
         })
         .pipe(Effect.map((result) => sanitizeCommitMessage(result)));
 
@@ -682,6 +685,7 @@ export const makeGitManager = Effect.gen(function* () {
     commitMessage?: string,
     preResolvedSuggestion?: CommitAndBranchSuggestion,
     filePaths?: readonly string[],
+    model?: string,
   ) =>
     Effect.gen(function* () {
       const suggestion =
@@ -691,6 +695,7 @@ export const makeGitManager = Effect.gen(function* () {
           branch,
           ...(commitMessage ? { commitMessage } : {}),
           ...(filePaths ? { filePaths } : {}),
+          ...(model ? { model } : {}),
         }));
       if (!suggestion) {
         return { status: "skipped_no_changes" as const };
@@ -704,7 +709,7 @@ export const makeGitManager = Effect.gen(function* () {
       };
     });
 
-  const runPrStep = (cwd: string, fallbackBranch: string | null) =>
+  const runPrStep = (cwd: string, fallbackBranch: string | null, model?: string) =>
     Effect.gen(function* () {
       const details = yield* gitCore.statusDetails(cwd);
       const branch = details.branch ?? fallbackBranch;
@@ -748,6 +753,7 @@ export const makeGitManager = Effect.gen(function* () {
         commitSummary: limitContext(rangeContext.commitSummary, 20_000),
         diffSummary: limitContext(rangeContext.diffSummary, 20_000),
         diffPatch: limitContext(rangeContext.diffPatch, 60_000),
+        ...(model ? { model } : {}),
       });
 
       const bodyFile = path.join(tempDir, `t3code-pr-body-${process.pid}-${randomUUID()}.md`);
@@ -972,6 +978,7 @@ export const makeGitManager = Effect.gen(function* () {
     branch: string | null,
     commitMessage?: string,
     filePaths?: readonly string[],
+    model?: string,
   ) =>
     Effect.gen(function* () {
       const suggestion = yield* resolveCommitAndBranchSuggestion({
@@ -980,6 +987,7 @@ export const makeGitManager = Effect.gen(function* () {
         ...(commitMessage ? { commitMessage } : {}),
         ...(filePaths ? { filePaths } : {}),
         includeBranch: true,
+        ...(model ? { model } : {}),
       });
       if (!suggestion) {
         return yield* gitManagerError(
@@ -1028,6 +1036,7 @@ export const makeGitManager = Effect.gen(function* () {
           initialStatus.branch,
           input.commitMessage,
           input.filePaths,
+          input.model,
         );
         branchStep = result.branchStep;
         commitMessageForStep = result.resolvedCommitMessage;
@@ -1044,6 +1053,7 @@ export const makeGitManager = Effect.gen(function* () {
         commitMessageForStep,
         preResolvedCommitSuggestion,
         input.filePaths,
+        input.model,
       );
 
       const push = wantsPush
@@ -1051,7 +1061,7 @@ export const makeGitManager = Effect.gen(function* () {
         : { status: "skipped_not_requested" as const };
 
       const pr = wantsPr
-        ? yield* runPrStep(input.cwd, currentBranch)
+        ? yield* runPrStep(input.cwd, currentBranch, input.model)
         : { status: "skipped_not_requested" as const };
 
       return {
diff --git a/apps/server/src/git/Services/TextGeneration.ts b/apps/server/src/git/Services/TextGeneration.ts
index daae27fe66..95c180dc31 100644
--- a/apps/server/src/git/Services/TextGeneration.ts
+++ b/apps/server/src/git/Services/TextGeneration.ts
@@ -19,6 +19,8 @@ export interface CommitMessageGenerationInput {
   stagedPatch: string;
   /** When true, the model also returns a semantic branch name for the change. */
   includeBranch?: boolean;
+  /** Optional model to use for generation. Falls back to default if not provided. */
+  model?: string;
 }
 
 export interface CommitMessageGenerationResult {
@@ -35,6 +37,8 @@ export interface PrContentGenerationInput {
   commitSummary: string;
   diffSummary: string;
   diffPatch: string;
+  /** Optional model to use for generation. Falls back to default if not provided. */
+  model?: string;
 }
 
 export interface PrContentGenerationResult {
@@ -46,6 +50,8 @@ export interface BranchNameGenerationInput {
   cwd: string;
   message: string;
   attachments?: ReadonlyArray<ChatAttachment> | undefined;
+  /** Optional model to use for generation. Falls back to default if not provided. */
+  model?: string;
 }
 
 export interface BranchNameGenerationResult {
diff --git a/apps/server/src/orchestration/Layers/ProviderCommandReactor.ts b/apps/server/src/orchestration/Layers/ProviderCommandReactor.ts
index fe02188450..7acaa8bcc6 100644
--- a/apps/server/src/orchestration/Layers/ProviderCommandReactor.ts
+++ b/apps/server/src/orchestration/Layers/ProviderCommandReactor.ts
@@ -365,6 +365,7 @@ const make = Effect.gen(function* () {
     readonly messageId: string;
     readonly messageText: string;
     readonly attachments?: ReadonlyArray<ChatAttachment>;
+    readonly model?: string;
   }) {
     if (!input.branch || !input.worktreePath) {
       return;
@@ -391,6 +392,7 @@ const make = Effect.gen(function* () {
         cwd,
         message: input.messageText,
         ...(attachments.length > 0 ? { attachments } : {}),
+        ...(input.model ? { model: input.model } : {}),
       })
       .pipe(
         Effect.catch((error) =>
@@ -459,6 +461,7 @@ const make = Effect.gen(function* () {
       messageId: message.id,
       messageText: message.text,
       ...(message.attachments !== undefined ? { attachments: message.attachments } : {}),
+      ...(event.payload.model !== undefined ? { model: event.payload.model } : {}),
     }).pipe(Effect.forkScoped);
 
     yield* sendTurnForThread({
diff --git a/apps/web/src/components/ChatView.tsx b/apps/web/src/components/ChatView.tsx
index 2784b65180..81cf880c22 100644
--- a/apps/web/src/components/ChatView.tsx
+++ b/apps/web/src/components/ChatView.tsx
@@ -3241,6 +3241,7 @@ export default function ChatView({ threadId }: ChatViewProps) {
           diffToggleShortcutLabel={diffPanelShortcutLabel}
           gitCwd={gitCwd}
           diffOpen={diffOpen}
+          selectedModel={selectedModel}
           onRunProjectScript={(script) => {
             void runProjectScript(script);
           }}
diff --git a/apps/web/src/components/GitActionsControl.tsx b/apps/web/src/components/GitActionsControl.tsx
index e4fad02af2..dae3745b25 100644
--- a/apps/web/src/components/GitActionsControl.tsx
+++ b/apps/web/src/components/GitActionsControl.tsx
@@ -1,4 +1,4 @@
-import type { GitStackedAction, GitStatusResult, ThreadId } from "@t3tools/contracts";
+import type { GitStackedAction, GitStatusResult, ModelSlug, ThreadId } from "@t3tools/contracts";
 import { useIsMutating, useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
 import { useCallback, useEffect, useMemo, useState } from "react";
 import { ChevronDownIcon, CloudUploadIcon, GitCommitIcon, InfoIcon } from "lucide-react";
@@ -48,6 +48,7 @@ import { readNativeApi } from "~/nativeApi";
 interface GitActionsControlProps {
   gitCwd: string | null;
   activeThreadId: ThreadId | null;
+  selectedModel?: ModelSlug | undefined;
 }
 
 interface PendingDefaultBranchAction {
@@ -153,7 +154,11 @@ function GitQuickActionIcon({ quickAction }: { quickAction: GitQuickAction }) {
   return <InfoIcon className={iconClassName} />;
 }
 
-export default function GitActionsControl({ gitCwd, activeThreadId }: GitActionsControlProps) {
+export default function GitActionsControl({
+  gitCwd,
+  activeThreadId,
+  selectedModel,
+}: GitActionsControlProps) {
   const threadToastData = useMemo(
     () => (activeThreadId ? { threadId: activeThreadId } : undefined),
     [activeThreadId],
@@ -351,6 +356,7 @@ export default function GitActionsControl({ gitCwd, activeThreadId }: GitActions
         ...(commitMessage ? { commitMessage } : {}),
         ...(featureBranch ? { featureBranch } : {}),
         ...(filePaths ? { filePaths } : {}),
+        ...(selectedModel ? { model: selectedModel } : {}),
       });
 
       try {
@@ -447,6 +453,7 @@ export default function GitActionsControl({ gitCwd, activeThreadId }: GitActions
       setPendingDefaultBranchAction,
       threadToastData,
       gitStatusForActions,
+      selectedModel,
     ],
   );
 
diff --git a/apps/web/src/components/chat/ChatHeader.tsx b/apps/web/src/components/chat/ChatHeader.tsx
index ea7f911bec..90d5c38f55 100644
--- a/apps/web/src/components/chat/ChatHeader.tsx
+++ b/apps/web/src/components/chat/ChatHeader.tsx
@@ -3,6 +3,7 @@ import {
   type ProjectScript,
   type ResolvedKeybindingsConfig,
   type ThreadId,
+  type ModelSlug,
 } from "@t3tools/contracts";
 import { memo } from "react";
 import GitActionsControl from "../GitActionsControl";
@@ -27,6 +28,7 @@ interface ChatHeaderProps {
   diffToggleShortcutLabel: string | null;
   gitCwd: string | null;
   diffOpen: boolean;
+  selectedModel: ModelSlug | undefined;
   onRunProjectScript: (script: ProjectScript) => void;
   onAddProjectScript: (input: NewProjectScriptInput) => Promise<void>;
   onUpdateProjectScript: (scriptId: string, input: NewProjectScriptInput) => Promise<void>;
@@ -47,6 +49,7 @@ export const ChatHeader = memo(function ChatHeader({
   diffToggleShortcutLabel,
   gitCwd,
   diffOpen,
+  selectedModel,
   onRunProjectScript,
   onAddProjectScript,
   onUpdateProjectScript,
@@ -93,7 +96,13 @@ export const ChatHeader = memo(function ChatHeader({
             openInCwd={openInCwd}
           />
         )}
-        {activeProjectName && <GitActionsControl gitCwd={gitCwd} activeThreadId={activeThreadId} />}
+        {activeProjectName && (
+          <GitActionsControl
+            gitCwd={gitCwd}
+            activeThreadId={activeThreadId}
+            selectedModel={selectedModel}
+          />
+        )}
         <Tooltip>
           <TooltipTrigger
             render={
diff --git a/apps/web/src/lib/gitReactQuery.ts b/apps/web/src/lib/gitReactQuery.ts
index 9b5fe7731f..25ab12b836 100644
--- a/apps/web/src/lib/gitReactQuery.ts
+++ b/apps/web/src/lib/gitReactQuery.ts
@@ -120,11 +120,13 @@ export function gitRunStackedActionMutationOptions(input: {
       commitMessage,
       featureBranch,
       filePaths,
+      model,
     }: {
       action: GitStackedAction;
       commitMessage?: string;
       featureBranch?: boolean;
       filePaths?: string[];
+      model?: string;
     }) => {
       const api = ensureNativeApi();
       if (!input.cwd) throw new Error("Git action is unavailable.");
@@ -134,6 +136,7 @@ export function gitRunStackedActionMutationOptions(input: {
         ...(commitMessage ? { commitMessage } : {}),
         ...(featureBranch ? { featureBranch } : {}),
         ...(filePaths ? { filePaths } : {}),
+        ...(model ? { model } : {}),
       });
     },
     onSettled: async () => {
diff --git a/packages/contracts/src/git.ts b/packages/contracts/src/git.ts
index 081b4d0d82..ed7d93ebd5 100644
--- a/packages/contracts/src/git.ts
+++ b/packages/contracts/src/git.ts
@@ -64,6 +64,7 @@ export const GitRunStackedActionInput = Schema.Struct({
   filePaths: Schema.optional(
     Schema.Array(TrimmedNonEmptyStringSchema).check(Schema.isMinLength(1)),
   ),
+  model: Schema.optional(Schema.String),
 });
 export type GitRunStackedActionInput = typeof GitRunStackedActionInput.Type;