diff --git a/packages/ai/src/index.ts b/packages/ai/src/index.ts
index 0fab4dbd..73a56538 100644
--- a/packages/ai/src/index.ts
+++ b/packages/ai/src/index.ts
@@ -3,6 +3,7 @@ export * from "./providers/anthropic.js";
 export * from "./providers/google.js";
 export * from "./providers/google-gemini-cli.js";
 export * from "./providers/google-vertex.js";
+export * from "./providers/openai-codex/index.js";
 export * from "./providers/openai-completions.js";
 export * from "./providers/openai-responses.js";
 export * from "./stream.js";
diff --git a/packages/ai/src/providers/openai-codex/index.ts b/packages/ai/src/providers/openai-codex/index.ts
new file mode 100644
index 00000000..86575ded
--- /dev/null
+++ b/packages/ai/src/providers/openai-codex/index.ts
@@ -0,0 +1,7 @@
+/**
+ * OpenAI Codex utilities - exported for use by coding-agent export
+ */
+
+export { type CacheMetadata, getCodexInstructions, getModelFamily, type ModelFamily } from "./prompts/codex.js";
+export { buildCodexPiBridge } from "./prompts/pi-codex-bridge.js";
+export { buildCodexSystemPrompt, type CodexSystemPrompt } from "./prompts/system-prompt.js";
diff --git a/packages/coding-agent/src/core/agent-session.ts b/packages/coding-agent/src/core/agent-session.ts
index 60868127..9deedc53 100644
--- a/packages/coding-agent/src/core/agent-session.ts
+++ b/packages/coding-agent/src/core/agent-session.ts
@@ -2057,9 +2057,9 @@ export class AgentSession {
 	 * @param outputPath Optional output path (defaults to session directory)
 	 * @returns Path to exported file
 	 */
-	exportToHtml(outputPath?: string): string {
+	async exportToHtml(outputPath?: string): Promise<string> {
 		const themeName = this.settingsManager.getTheme();
-		return exportSessionToHtml(this.sessionManager, this.state, { outputPath, themeName });
+		return await exportSessionToHtml(this.sessionManager, this.state, { outputPath, themeName });
 	}
 
 	// =========================================================================
diff --git a/packages/coding-agent/src/core/export-html/index.ts b/packages/coding-agent/src/core/export-html/index.ts
index 577f262c..3af74df6 100644
--- a/packages/coding-agent/src/core/export-html/index.ts
+++ b/packages/coding-agent/src/core/export-html/index.ts
@@ -1,4 +1,5 @@
 import type { AgentState } from "@mariozechner/pi-agent-core";
+import { buildCodexPiBridge, getCodexInstructions, getModelFamily } from "@mariozechner/pi-ai";
 import { existsSync, readFileSync, writeFileSync } from "fs";
 import { basename, join } from "path";
 import { APP_NAME, getExportTemplateDir } from "../../config.js";
@@ -10,6 +11,47 @@ export interface ExportOptions {
 	themeName?: string;
 }
 
+interface ProviderSystemPrompt {
+	title: string;
+	content: string;
+	note?: string;
+}
+
+/**
+ * Build the provider-specific system prompt for display in exports.
+ * Currently only supports OpenAI Codex provider.
+ */
+async function buildProviderSystemPrompt(state?: AgentState): Promise<ProviderSystemPrompt | undefined> {
+	if (!state?.model || state.model.provider !== "openai-codex") {
+		return undefined;
+	}
+
+	let instructions: string | null = null;
+	try {
+		instructions = await getCodexInstructions(state.model.id);
+	} catch {
+		// Cache miss or fetch failed - that's fine
+	}
+
+	const bridgeText = buildCodexPiBridge(state.tools);
+	const userPrompt = state.systemPrompt || "";
+	const modelFamily = getModelFamily(state.model.id);
+
+	const instructionsText =
+		instructions || "(Codex instructions not cached. Run a Codex request to populate the local cache.)";
+	const note = instructions
+		? `Injected by the OpenAI Codex provider for model family "${modelFamily}" (instructions + bridge + user system prompt).`
+		: "Codex instructions unavailable; showing bridge and user system prompt only.";
+
+	const content = `# Codex Instructions\n${instructionsText}\n\n# Codex-Pi Bridge\n${bridgeText}\n\n# User System Prompt\n${userPrompt || "(empty)"}`;
+
+	return {
+		title: "Injected Prompt (OpenAI Codex)",
+		content,
+		note,
+	};
+}
+
 /** Parse a color string to RGB values. Supports hex (#RRGGBB) and rgb(r,g,b) formats. */
 function parseColor(color: string): { r: number; g: number; b: number } | undefined {
 	const hexMatch = color.match(/^#([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})$/);
@@ -103,6 +145,7 @@ interface SessionData {
 	entries: ReturnType<SessionManager["getEntries"]>;
 	leafId: string | null;
 	systemPrompt?: string;
+	providerSystemPrompt?: ProviderSystemPrompt;
 	tools?: { name: string; description: string }[];
 }
 
@@ -146,7 +189,11 @@ function generateHtml(sessionData: SessionData, themeName?: string): string {
  * Export session to HTML using SessionManager and AgentState.
  * Used by TUI's /export command.
  */
-export function exportSessionToHtml(sm: SessionManager, state?: AgentState, options?: ExportOptions | string): string {
+export async function exportSessionToHtml(
+	sm: SessionManager,
+	state?: AgentState,
+	options?: ExportOptions | string,
+): Promise<string> {
 	const opts: ExportOptions = typeof options === "string" ? { outputPath: options } : options || {};
 
 	const sessionFile = sm.getSessionFile();
@@ -162,6 +209,7 @@ export function exportSessionToHtml(sm: SessionManager, state?: AgentState, opti
 		entries: sm.getEntries(),
 		leafId: sm.getLeafId(),
 		systemPrompt: state?.systemPrompt,
+		providerSystemPrompt: await buildProviderSystemPrompt(state),
 		tools: state?.tools?.map((t) => ({ name: t.name, description: t.description })),
 	};
 
@@ -195,6 +243,7 @@ export function exportFromFile(inputPath: string, options?: ExportOptions | stri
 		entries: sm.getEntries(),
 		leafId: sm.getLeafId(),
 		systemPrompt: undefined,
+		providerSystemPrompt: undefined,
 		tools: undefined,
 	};
 
diff --git a/packages/coding-agent/src/core/export-html/template.css b/packages/coding-agent/src/core/export-html/template.css
index 8fbdcd01..eac001a1 100644
--- a/packages/coding-agent/src/core/export-html/template.css
+++ b/packages/coding-agent/src/core/export-html/template.css
@@ -593,6 +593,17 @@
       display: block;
     }
 
+    .system-prompt.provider-prompt {
+      border-left: 3px solid var(--warning);
+    }
+
+    .system-prompt-note {
+      font-size: 10px;
+      font-style: italic;
+      color: var(--muted);
+      margin-top: 4px;
+    }
+
     /* Tools list */
     .tools-list {
       background: var(--customMessageBg);
diff --git a/packages/coding-agent/src/core/export-html/template.js b/packages/coding-agent/src/core/export-html/template.js
index 6d3e5929..52c2e493 100644
--- a/packages/coding-agent/src/core/export-html/template.js
+++ b/packages/coding-agent/src/core/export-html/template.js
@@ -12,7 +12,7 @@
         bytes[i] = binary.charCodeAt(i);
       }
       const data = JSON.parse(new TextDecoder('utf-8').decode(bytes));
-      const { header, entries, leafId: defaultLeafId, systemPrompt, tools } = data;
+      const { header, entries, leafId: defaultLeafId, systemPrompt, providerSystemPrompt, tools } = data;
 
       // ============================================================
       // URL PARAMETER HANDLING
@@ -1060,7 +1060,32 @@
             </div>
           </div>`;
 
-        if (systemPrompt) {
+        // Render provider-injected system prompt (e.g., Codex) if present
+        if (providerSystemPrompt) {
+          const lines = providerSystemPrompt.content.split('\n');
+          const previewLines = 10;
+          const noteHtml = providerSystemPrompt.note 
+            ? `<div class="system-prompt-note">${escapeHtml(providerSystemPrompt.note)}</div>` 
+            : '';
+          if (lines.length > previewLines) {
+            const preview = lines.slice(0, previewLines).join('\n');
+            const remaining = lines.length - previewLines;
+            html += `<div class="system-prompt provider-prompt expandable" onclick="this.classList.toggle('expanded')">
+              <div class="system-prompt-header">${escapeHtml(providerSystemPrompt.title)}</div>
+              ${noteHtml}
+              <div class="system-prompt-preview">${escapeHtml(preview)}</div>
+              <div class="system-prompt-expand-hint">... (${remaining} more lines, click to expand)</div>
+              <div class="system-prompt-full">${escapeHtml(providerSystemPrompt.content)}</div>
+            </div>`;
+          } else {
+            html += `<div class="system-prompt provider-prompt">
+              <div class="system-prompt-header">${escapeHtml(providerSystemPrompt.title)}</div>
+              ${noteHtml}
+              <div class="system-prompt-full" style="display: block">${escapeHtml(providerSystemPrompt.content)}</div>
+            </div>`;
+          }
+        } else if (systemPrompt) {
+          // Standard system prompt (non-Codex providers)
           const lines = systemPrompt.split('\n');
           const previewLines = 10;
           if (lines.length > previewLines) {
diff --git a/packages/coding-agent/src/modes/interactive/interactive-mode.ts b/packages/coding-agent/src/modes/interactive/interactive-mode.ts
index 6242ef52..c52e1daf 100644
--- a/packages/coding-agent/src/modes/interactive/interactive-mode.ts
+++ b/packages/coding-agent/src/modes/interactive/interactive-mode.ts
@@ -999,7 +999,7 @@ export class InteractiveMode {
 				return;
 			}
 			if (text.startsWith("/export")) {
-				this.handleExportCommand(text);
+				await this.handleExportCommand(text);
 				this.editor.setText("");
 				return;
 			}
@@ -2402,12 +2402,12 @@ export class InteractiveMode {
 	// Command handlers
 	// =========================================================================
 
-	private handleExportCommand(text: string): void {
+	private async handleExportCommand(text: string): Promise<void> {
 		const parts = text.split(/\s+/);
 		const outputPath = parts.length > 1 ? parts[1] : undefined;
 
 		try {
-			const filePath = this.session.exportToHtml(outputPath);
+			const filePath = await this.session.exportToHtml(outputPath);
 			this.showStatus(`Session exported to: ${filePath}`);
 		} catch (error: unknown) {
 			this.showError(`Failed to export session: ${error instanceof Error ? error.message : "Unknown error"}`);
@@ -2430,7 +2430,7 @@ export class InteractiveMode {
 		// Export to a temp file
 		const tmpFile = path.join(os.tmpdir(), "session.html");
 		try {
-			this.session.exportToHtml(tmpFile);
+			await this.session.exportToHtml(tmpFile);
 		} catch (error: unknown) {
 			this.showError(`Failed to export session: ${error instanceof Error ? error.message : "Unknown error"}`);
 			return;
diff --git a/packages/coding-agent/src/modes/rpc/rpc-mode.ts b/packages/coding-agent/src/modes/rpc/rpc-mode.ts
index fb32de59..b3ac5c38 100644
--- a/packages/coding-agent/src/modes/rpc/rpc-mode.ts
+++ b/packages/coding-agent/src/modes/rpc/rpc-mode.ts
@@ -431,7 +431,7 @@ export async function runRpcMode(session: AgentSession): Promise<never> {
 			}
 
 			case "export_html": {
-				const path = session.exportToHtml(command.outputPath);
+				const path = await session.exportToHtml(command.outputPath);
 				return success(id, "export_html", { path });
 			}