diff --git a/packages/http-client-python/assets.json b/packages/http-client-python/assets.json
index 13cce63bc99..acc273622d4 100644
--- a/packages/http-client-python/assets.json
+++ b/packages/http-client-python/assets.json
@@ -2,5 +2,5 @@
   "AssetsRepo": "l0lawrence/typespec-assets",
   "AssetsRepoPrefixPath": "python",
   "TagPrefix": "python/tests",
-  "Tag": "python/tests_7870c7a975"
+  "Tag": "python/tests_481763e148"
 }
diff --git a/packages/http-client-python/eng/scripts/ci/render-diff.ts b/packages/http-client-python/eng/scripts/ci/render-diff.ts
index 3c1f9496cd1..e1b8700782e 100644
--- a/packages/http-client-python/eng/scripts/ci/render-diff.ts
+++ b/packages/http-client-python/eng/scripts/ci/render-diff.ts
@@ -31,7 +31,7 @@ import { createRequire } from "module";
 import { tmpdir } from "os";
 import { dirname, join, resolve } from "path";
 import pc from "picocolors";
-import { fileURLToPath } from "url";
+import { fileURLToPath, pathToFileURL } from "url";
 import { parseArgs } from "util";
 
 import { FLAVORS, readAssetsConfig, restoreFullBaseline } from "./assets.js";
@@ -47,6 +47,7 @@ const argv = parseArgs({
     output: { type: "string", short: "o" },
     generated: { type: "string", short: "g" },
     title: { type: "string", short: "t" },
+    open: { type: "boolean" },
     help: { type: "boolean", short: "h" },
   },
 });
@@ -61,6 +62,7 @@ ${pc.bold("Options:")}
   -o, --output <dir>     Output directory (default: temp/diff-site).
   -g, --generated <dir>  Current generated dir (default: tests/generated).
   -t, --title <text>     Title shown on the diff page.
+      --open             Open the rendered diff in your default browser.
   -h, --help             Show this help.
 `);
   process.exit(0);
@@ -268,17 +270,41 @@ async function main(): Promise<void> {
     writeFileSync(join(OUTPUT_DIR, "summary.json"), JSON.stringify(summary, null, 2) + "\n");
     writeSite(diffText, summary);
 
+    const indexPath = join(OUTPUT_DIR, "index.html");
     console.log(
       pc.green(
         `Diff rendered to ${OUTPUT_DIR} ` +
           `(${summary.filesChanged} files, +${summary.additions}/-${summary.deletions}).`,
       ),
     );
+    // Print a clickable file:// URL so the page is one click away locally, and
+    // optionally pop it open in the default browser.
+    console.log(pc.cyan(`View it at ${pathToFileURL(indexPath).href}`));
+    if (argv.values.open) {
+      openInBrowser(indexPath);
+    }
   } finally {
     rmSync(workDir, { recursive: true, force: true });
   }
 }
 
+/** Opens a local file in the OS default browser; never fails the run. */
+function openInBrowser(target: string): void {
+  try {
+    if (process.platform === "win32") {
+      // `start` is a cmd builtin; the empty first arg is the window title so a
+      // path with spaces isn't mistaken for one.
+      execFileSync("cmd", ["/c", "start", "", target], { stdio: "ignore" });
+    } else if (process.platform === "darwin") {
+      execFileSync("open", [target], { stdio: "ignore" });
+    } else {
+      execFileSync("xdg-open", [target], { stdio: "ignore" });
+    }
+  } catch (err) {
+    console.warn(pc.yellow(`Could not open a browser automatically: ${err}`));
+  }
+}
+
 interface FileDiff {
   /** Display path (baseline/current prefixes stripped). */
   path: string;
@@ -289,6 +315,35 @@ interface FileDiff {
   status: "added" | "removed" | "modified";
 }
 
+/**
+ * Rewrites a file chunk's diff header so both sides share the same path.
+ *
+ * The diff comes from `git diff --no-index baseline current`, so every header
+ * reads `a/baseline/<path>` vs `b/current/<path>`. Because those two paths
+ * differ only by the temp-dir prefix, diff2html mistakes every file for a
+ * RENAME (showing `{baseline → current}`). Stripping the `baseline/`/`current/`
+ * prefixes makes old === new path, so it renders as a normal modification.
+ */
+function normalizeChunkHeader(chunk: string): string {
+  const lines = chunk.split("\n");
+  for (let i = 0; i < lines.length; i++) {
+    const line = lines[i];
+    if (line.startsWith("@@")) break; // header is done once hunks begin
+    if (line.startsWith("diff --git ")) {
+      lines[i] = line.replace(/ a\/baseline\//g, " a/").replace(/ b\/current\//g, " b/");
+    } else if (line.startsWith("--- ")) {
+      lines[i] = line.replace(/^--- a\/baseline\//, "--- a/");
+    } else if (line.startsWith("+++ ")) {
+      lines[i] = line.replace(/^\+\+\+ b\/current\//, "+++ b/");
+    } else if (line.startsWith("rename from ")) {
+      lines[i] = line.replace(/^rename from baseline\//, "rename from ");
+    } else if (line.startsWith("rename to ")) {
+      lines[i] = line.replace(/^rename to current\//, "rename to ");
+    }
+  }
+  return lines.join("\n");
+}
+
 /** Splits a `git diff --no-index` blob into one chunk per file. */
 function splitDiffByFile(diffText: string): FileDiff[] {
   const files: FileDiff[] = [];
@@ -323,7 +378,7 @@ function splitDiffByFile(diffText: string): FileDiff[] {
     const display = strip(isAdded ? newPath : oldPath) || strip(newPath) || "(unknown)";
     files.push({
       path: display,
-      chunk,
+      chunk: normalizeChunkHeader(chunk),
       additions,
       deletions,
       status: isAdded ? "added" : isRemoved ? "removed" : "modified",
diff --git a/packages/http-client-python/generator/pygen/codegen/templates/version.py.jinja2 b/packages/http-client-python/generator/pygen/codegen/templates/version.py.jinja2
index 2086d0fc1d7..08faa5a6bb1 100644
--- a/packages/http-client-python/generator/pygen/codegen/templates/version.py.jinja2
+++ b/packages/http-client-python/generator/pygen/codegen/templates/version.py.jinja2
@@ -3,4 +3,5 @@
 {{ code_model.license_header }}
 {% endif %}
 
+# Generated by the TypeSpec Python emitter.
 VERSION = "{{ code_model.options.get("package-version") }}"
diff --git a/packages/http-client-python/package.json b/packages/http-client-python/package.json
index 0a2dcfb9c65..76d25e81c02 100644
--- a/packages/http-client-python/package.json
+++ b/packages/http-client-python/package.json
@@ -52,6 +52,8 @@
     "regenerate": "tsx ./eng/scripts/ci/regenerate.ts",
     "regenerate:push-assets": "tsx ./eng/scripts/ci/push-assets.ts",
     "regenerate:render-diff": "tsx ./eng/scripts/ci/render-diff.ts",
+    "regenerate:diff": "tsx ./eng/scripts/ci/render-diff.ts --open",
+    "regenerate:review": "npm run regenerate && npm run regenerate:diff",
     "ci": "npm run test:emitter && npm run ci:generated",
     "ci:generated": "tsx ./eng/scripts/ci/run-tests.ts --generator --env=ci",
     "change:version": "pnpm chronus version --ignore-policies --only @typespec/http-client-python",