diff --git a/.env.example b/.env.example
index e92054c..467269d 100644
--- a/.env.example
+++ b/.env.example
@@ -10,6 +10,8 @@ DEV_OVERRIDE_PRICING_TIER=
 DEV_OVERRIDE_PRICING_TIER_USER_IDS=
 FINNHUB_API_KEY=
 FINNHUB_BASE_URL=
+MISTRAL_API_KEY=
+MISTRAL_PR_REVIEW_MODEL=
 NEXT_PUBLIC_APPWRITE_ENDPOINT=
 NEXT_PUBLIC_APPWRITE_PROJECT_ID=
 NEXT_PUBLIC_GTM_ID=
diff --git a/.github/workflows/mistral-pr-review.yml b/.github/workflows/mistral-pr-review.yml
new file mode 100644
index 0000000..dee79ac
--- /dev/null
+++ b/.github/workflows/mistral-pr-review.yml
@@ -0,0 +1,35 @@
+name: Mistral PR review
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: read
+  pull-requests: write
+
+concurrency:
+  group: mistral-pr-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+jobs:
+  mistral-review:
+    if: github.event.pull_request.draft == false
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: oven-sh/setup-bun@v2
+
+      - name: Mistral code review comment
+        env:
+          MISTRAL_API_KEY: ${{ secrets.MISTRAL_API_KEY }}
+          MISTRAL_MODEL: ${{ vars.MISTRAL_PR_REVIEW_MODEL }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          BASE_SHA: ${{ github.event.pull_request.base.sha }}
+          HEAD_SHA: ${{ github.event.pull_request.head.sha }}
+          REPOSITORY: ${{ github.repository }}
+        run: bun run scripts/mistral-pr-review.ts
diff --git a/package.json b/package.json
index cde4f9d..434600d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "stock-exchange-app",
-  "version": "0.56.0",
+  "version": "0.57.0",
   "private": true,
   "scripts": {
     "dev": "bun --bun next dev",
diff --git a/scripts/mistral-pr-review.ts b/scripts/mistral-pr-review.ts
new file mode 100644
index 0000000..868fb48
--- /dev/null
+++ b/scripts/mistral-pr-review.ts
@@ -0,0 +1,164 @@
+/**
+ * CI helper: reads BASE_SHA..HEAD_SHA diff, asks Mistral for a review, posts or updates one PR comment.
+ * Skips cleanly when MISTRAL_API_KEY is unset.
+ */
+import { spawnSync } from "node:child_process";
+
+const MARKER = "<!-- mistral-pr-review-bot -->";
+const MAX_DIFF_CHARS = 120_000;
+
+function required(name: string): string {
+  const v = process.env[name];
+  if (!v) throw new Error(`Missing env ${name}`);
+  return v;
+}
+
+function gitDiff(base: string, head: string): string {
+  const result = spawnSync("git", ["diff", `${base}...${head}`], {
+    encoding: "utf-8",
+    maxBuffer: 10 * 1024 * 1024,
+  });
+  if (result.error) throw result.error;
+  if (result.status !== 0) {
+    throw new Error(
+      `git diff failed: ${(result.stderr ?? "").trim() || result.status}`
+    );
+  }
+  const out = result.stdout ?? "";
+  return out.length > MAX_DIFF_CHARS
+    ? `${out.slice(0, MAX_DIFF_CHARS)}\n\n…(diff truncated after ${MAX_DIFF_CHARS} chars)`
+    : out;
+}
+
+async function mistralReview(
+  diff: string,
+  apiKey: string,
+  model: string
+): Promise<string> {
+  const system = `You are a senior engineer reviewing a pull request. Be concise and actionable.
+Focus on: correctness, edge cases, security, performance, and maintainability.
+Use markdown with short sections. Do not repeat the entire diff. If the change looks fine, say so briefly.`;
+
+  const res = await fetch("https://api.mistral.ai/v1/chat/completions", {
+    method: "POST",
+    headers: {
+      Authorization: `Bearer ${apiKey}`,
+      "Content-Type": "application/json",
+    },
+    body: JSON.stringify({
+      model,
+      temperature: 0.2,
+      max_tokens: 4096,
+      messages: [
+        { role: "system", content: system },
+        {
+          role: "user",
+          content: `Review this unified git diff (PR).\n\n${diff}`,
+        },
+      ],
+    }),
+  });
+
+  if (!res.ok) {
+    const t = await res.text();
+    throw new Error(`Mistral API ${res.status}: ${t.slice(0, 500)}`);
+  }
+  const data = (await res.json()) as {
+    choices?: Array<{ message?: { content?: string } }>;
+  };
+  const text = data.choices?.[0]?.message?.content?.trim();
+  if (!text) throw new Error("Mistral returned empty content");
+  return text;
+}
+
+async function githubJson(
+  token: string,
+  path: string,
+  init?: RequestInit
+): Promise<unknown> {
+  const res = await fetch(`https://api.github.com${path}`, {
+    ...init,
+    headers: {
+      Accept: "application/vnd.github+json",
+      "X-GitHub-Api-Version": "2022-11-28",
+      Authorization: `Bearer ${token}`,
+      ...(init?.headers as Record<string, string>),
+    },
+  });
+  const text = await res.text();
+  if (!res.ok)
+    throw new Error(`GitHub API ${res.status} ${path}: ${text.slice(0, 400)}`);
+  return text ? JSON.parse(text) : null;
+}
+
+async function upsertComment(
+  token: string,
+  owner: string,
+  repo: string,
+  issueNumber: number,
+  body: string
+): Promise<void> {
+  const comments = (await githubJson(
+    token,
+    `/repos/${owner}/${repo}/issues/${issueNumber}/comments?per_page=100`
+  )) as Array<{ id: number; body?: string }>;
+
+  const existing = comments.find((c) => c.body?.includes(MARKER));
+  const fullBody = `${MARKER}\n## Mistral code review\n\n${body}`;
+
+  if (existing) {
+    await githubJson(
+      token,
+      `/repos/${owner}/${repo}/issues/comments/${existing.id}`,
+      {
+        method: "PATCH",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ body: fullBody }),
+      }
+    );
+    return;
+  }
+
+  await githubJson(
+    token,
+    `/repos/${owner}/${repo}/issues/${issueNumber}/comments`,
+    {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({ body: fullBody }),
+    }
+  );
+}
+
+async function main(): Promise<void> {
+  const apiKey = process.env.MISTRAL_API_KEY?.trim();
+  if (!apiKey) {
+    console.log("MISTRAL_API_KEY not set; skipping Mistral PR review.");
+    return;
+  }
+
+  const token = required("GITHUB_TOKEN");
+  const repository = required("REPOSITORY");
+  const prNumber = Number(required("PR_NUMBER"));
+  const baseSha = required("BASE_SHA");
+  const headSha = required("HEAD_SHA");
+  const model = (process.env.MISTRAL_MODEL || "codestral-latest").trim();
+
+  const [owner, repo] = repository.split("/");
+  if (!owner || !repo) throw new Error(`Invalid REPOSITORY: ${repository}`);
+
+  const diff = gitDiff(baseSha, headSha);
+  if (!diff.trim()) {
+    console.log("Empty diff; skipping.");
+    return;
+  }
+
+  const review = await mistralReview(diff, apiKey, model);
+  await upsertComment(token, owner, repo, prNumber, review);
+  console.log("Mistral PR review comment posted.");
+}
+
+main().catch((e) => {
+  console.error(e);
+  process.exit(1);
+});