diff --git a/data_analysis_script/src/data_analysis_script/cli.py b/data_analysis_script/src/data_analysis_script/cli.py
new file mode 100644
index 0000000..7d79e7b
--- /dev/null
+++ b/data_analysis_script/src/data_analysis_script/cli.py
@@ -0,0 +1,57 @@
+from __future__ import annotations
+import argparse
+import json
+import sys
+from pathlib import Path
+import logging
+
+from data_analysis_script.core import analyze_logs, AnalysisResults
+
+
+def main() -> None:
+    """CLI entrypoint for the Run 26 Log Analysis."""
+    parser = argparse.ArgumentParser(
+        description="Analyse Run 26 experiment logs and compute latency metrics."
+    )
+    parser.add_argument(
+        "--log_file",
+        required=True,
+        help="Pfad zur Eingabe-Logdatei im CSV- oder JSON-Format."
+    )
+    parser.add_argument(
+        "--output",
+        required=False,
+        default="output/run_26_analysis_results.json",
+        help="Pfad zur Ausgabe-JSON-Datei mit Analyseergebnissen."
+    )
+
+    args = parser.parse_args()
+
+    log_path = Path(args.log_file)
+    if not log_path.exists():
+        sys.stderr.write(f"Error: Log file not found: {log_path}\n")
+        sys.exit(1)
+
+    try:
+        result: AnalysisResults = analyze_logs(str(log_path))
+    except Exception as exc:
+        logging.exception("Failed to analyze logs: %s", exc)
+        sys.stderr.write(f"Error: {exc}\n")
+        sys.exit(2)
+
+    output_path = Path(args.output)
+    output_path.parent.mkdir(parents=True, exist_ok=True)
+
+    try:
+        with output_path.open("w", encoding="utf-8") as f:
+            json.dump(result.to_json(), f, indent=2)
+    except Exception as exc:
+        logging.exception("Failed to write output file: %s", exc)
+        sys.stderr.write(f"Error writing output file: {exc}\n")
+        sys.exit(3)
+
+    print(f"Analysis complete. Results saved to {output_path}")
+
+
+if __name__ == "__main__":
+    main()