diff --git a/interpreter/core/computer/terminal/languages/sandbox/__init__.py b/interpreter/core/computer/terminal/languages/sandbox/__init__.py
new file mode 100644
index 0000000000..fd45d31ee6
--- /dev/null
+++ b/interpreter/core/computer/terminal/languages/sandbox/__init__.py
@@ -0,0 +1,26 @@
+"""
+Sandbox-backed language implementations for OpenSandbox execution.
+"""
+
+from .sandbox_language import SandboxLanguage
+
+
+class SandboxPython(SandboxLanguage):
+    file_extension = "py"
+    name = "Python"
+    aliases = ["py"]
+    sandbox_lang = "python"
+
+
+class SandboxShell(SandboxLanguage):
+    file_extension = "sh"
+    name = "Shell"
+    aliases = ["bash", "sh", "zsh"]
+    sandbox_lang = "bash"
+
+
+class SandboxJavaScript(SandboxLanguage):
+    file_extension = "js"
+    name = "JavaScript"
+    aliases = ["js"]
+    sandbox_lang = "javascript"
diff --git a/interpreter/core/computer/terminal/languages/sandbox/sandbox_language.py b/interpreter/core/computer/terminal/languages/sandbox/sandbox_language.py
new file mode 100644
index 0000000000..54de0b09ae
--- /dev/null
+++ b/interpreter/core/computer/terminal/languages/sandbox/sandbox_language.py
@@ -0,0 +1,33 @@
+"""
+SandboxLanguage - Base class for sandbox-backed language execution.
+
+Extends BaseLanguage and delegates all execution to a shared SandboxManager.
+"""
+
+from ...base_language import BaseLanguage
+
+
+class SandboxLanguage(BaseLanguage):
+    """
+    Base class for languages that execute code in an OpenSandbox container.
+
+    Subclasses set `name`, `aliases`, `file_extension`, and `sandbox_lang`
+    to define which language they handle.
+    """
+
+    _is_sandbox_language = True  # Marker for Terminal instantiation logic
+    sandbox_lang = None  # Override in subclasses: "python", "bash", "javascript"
+
+    def __init__(self, sandbox_manager):
+        self.sandbox_manager = sandbox_manager
+
+    def run(self, code):
+        yield from self.sandbox_manager.execute(self.sandbox_lang, code)
+
+    def stop(self):
+        self.sandbox_manager.stop()
+
+    def terminate(self):
+        # Don't kill the whole sandbox from one language handler.
+        # The SandboxManager.terminate() is called by Terminal.terminate().
+        pass
diff --git a/interpreter/core/computer/terminal/languages/sandbox/sandbox_manager.py b/interpreter/core/computer/terminal/languages/sandbox/sandbox_manager.py
new file mode 100644
index 0000000000..18936e2d2c
--- /dev/null
+++ b/interpreter/core/computer/terminal/languages/sandbox/sandbox_manager.py
@@ -0,0 +1,239 @@
+"""
+SandboxManager - Manages OpenSandbox lifecycle and code execution.
+
+Owns a single sandbox instance and CodeInterpreterSync, providing
+streaming code execution that yields LMC-format chunks.
+"""
+
+import os
+import queue
+import threading
+import traceback
+
+LANGUAGE_MAP = {
+    "python": "python",
+    "py": "python",
+    "shell": "bash",
+    "bash": "bash",
+    "sh": "bash",
+    "zsh": "bash",
+    "javascript": "javascript",
+    "js": "javascript",
+}
+
+# Default sandbox image for code interpreter
+DEFAULT_IMAGE = "opensandbox/code-interpreter:latest"
+
+
+class SandboxManager:
+    def __init__(
+        self,
+        api_key=None,
+        domain=None,
+        image=None,
+        timeout_minutes=10,
+    ):
+        self.api_key = api_key or os.environ.get("OPEN_SANDBOX_API_KEY")
+        self.domain = domain or os.environ.get("OPEN_SANDBOX_DOMAIN")
+        self.image = image or os.environ.get("OPEN_SANDBOX_IMAGE", DEFAULT_IMAGE)
+        self.timeout_minutes = timeout_minutes
+
+        self._sandbox = None
+        self._code_interpreter = None
+        self._contexts = {}  # language_name -> CodeContextSync
+        self._current_execution_id = None
+        self._lock = threading.Lock()
+
+    def _ensure_sandbox(self):
+        """Lazily create the sandbox and code interpreter on first use."""
+        if self._sandbox is not None:
+            return
+
+        try:
+            from opensandbox.sync.sandbox import SandboxSync
+            from opensandbox.config import ConnectionConfig
+            from code_interpreter.sync.code_interpreter import CodeInterpreterSync
+        except ImportError:
+            raise ImportError(
+                "OpenSandbox packages are required for sandbox mode. "
+                "Install with: pip install opensandbox opensandbox-code-interpreter"
+            )
+
+        if not self.api_key:
+            raise ValueError(
+                "OpenSandbox API key is required. "
+                "Set via --sandbox_api_key or OPEN_SANDBOX_API_KEY env var."
+            )
+        if not self.domain:
+            raise ValueError(
+                "OpenSandbox domain is required. "
+                "Set via --sandbox_domain or OPEN_SANDBOX_DOMAIN env var."
+            )
+
+        from datetime import timedelta
+
+        config = ConnectionConfig(
+            api_key=self.api_key,
+            domain=self.domain,
+        )
+
+        self._sandbox = SandboxSync.create(
+            self.image,
+            connection_config=config,
+            timeout=timedelta(minutes=self.timeout_minutes),
+        )
+        self._code_interpreter = CodeInterpreterSync.create(sandbox=self._sandbox)
+
+    def _get_context(self, language):
+        """Get or create an execution context for the given language."""
+        sandbox_lang = LANGUAGE_MAP.get(language.lower())
+        if sandbox_lang is None:
+            raise ValueError(
+                f"Language '{language}' is not supported in sandbox mode. "
+                f"Supported: {list(LANGUAGE_MAP.keys())}"
+            )
+
+        if sandbox_lang not in self._contexts:
+            self._contexts[sandbox_lang] = (
+                self._code_interpreter.codes.create_context(sandbox_lang)
+            )
+        return self._contexts[sandbox_lang], sandbox_lang
+
+    def execute(self, language, code):
+        """
+        Execute code in the sandbox. Generator yielding LMC-format dicts.
+
+        Mirrors the streaming pattern from SubprocessLanguage.run().
+        """
+        try:
+            self._ensure_sandbox()
+        except Exception:
+            yield {
+                "type": "console",
+                "format": "output",
+                "content": traceback.format_exc(),
+            }
+            return
+
+        try:
+            context, sandbox_lang = self._get_context(language)
+        except Exception:
+            yield {
+                "type": "console",
+                "format": "output",
+                "content": traceback.format_exc(),
+            }
+            return
+
+        from opensandbox.models.execd_sync import ExecutionHandlersSync
+
+        message_queue = queue.Queue()
+        done_event = threading.Event()
+        execution_result = [None]  # mutable container for thread result
+
+        def on_stdout(msg):
+            message_queue.put({
+                "type": "console",
+                "format": "output",
+                "content": msg.text,
+            })
+
+        def on_stderr(msg):
+            message_queue.put({
+                "type": "console",
+                "format": "output",
+                "content": msg.text,
+            })
+
+        def on_error(err):
+            tb = "\n".join(err.traceback) if err.traceback else ""
+            content = f"{err.name}: {err.value}"
+            if tb:
+                content = f"{tb}\n{content}"
+            message_queue.put({
+                "type": "console",
+                "format": "output",
+                "content": content,
+            })
+
+        def on_execution_complete(complete):
+            done_event.set()
+
+        handlers = ExecutionHandlersSync(
+            on_stdout=on_stdout,
+            on_stderr=on_stderr,
+            on_error=on_error,
+            on_execution_complete=on_execution_complete,
+        )
+
+        def run_in_thread():
+            try:
+                result = self._code_interpreter.codes.run(
+                    code,
+                    context=context,
+                    handlers=handlers,
+                )
+                execution_result[0] = result
+                if result and result.id:
+                    self._current_execution_id = result.id
+            except Exception:
+                message_queue.put({
+                    "type": "console",
+                    "format": "output",
+                    "content": traceback.format_exc(),
+                })
+            finally:
+                done_event.set()
+
+        thread = threading.Thread(target=run_in_thread, daemon=True)
+        thread.start()
+
+        # Yield output as it arrives, same pattern as SubprocessLanguage
+        while True:
+            try:
+                output = message_queue.get(timeout=0.3)
+                yield output
+            except queue.Empty:
+                if done_event.is_set():
+                    # Drain remaining items
+                    while not message_queue.empty():
+                        yield message_queue.get()
+                    break
+
+        # If execution produced results (e.g. expression values), yield them
+        result = execution_result[0]
+        if result and result.result:
+            for r in result.result:
+                if r.text:
+                    yield {
+                        "type": "console",
+                        "format": "output",
+                        "content": r.text,
+                    }
+
+        self._current_execution_id = None
+
+    def stop(self):
+        """Interrupt currently running execution."""
+        exec_id = self._current_execution_id
+        if exec_id and self._code_interpreter:
+            try:
+                self._code_interpreter.codes.interrupt(exec_id)
+            except Exception:
+                pass
+
+    def terminate(self):
+        """Kill the sandbox and release all resources."""
+        if self._sandbox:
+            try:
+                self._sandbox.kill()
+            except Exception:
+                pass
+            try:
+                self._sandbox.close()
+            except Exception:
+                pass
+        self._sandbox = None
+        self._code_interpreter = None
+        self._contexts = {}
+        self._current_execution_id = None
diff --git a/interpreter/core/computer/terminal/terminal.py b/interpreter/core/computer/terminal/terminal.py
index b9f92582f6..073143e1d8 100644
--- a/interpreter/core/computer/terminal/terminal.py
+++ b/interpreter/core/computer/terminal/terminal.py
@@ -33,18 +33,42 @@
 class Terminal:
     def __init__(self, computer):
         self.computer = computer
-        self.languages = [
-            Ruby,
-            Python,
-            Shell,
-            JavaScript,
-            HTML,
-            AppleScript,
-            R,
-            PowerShell,
-            React,
-            Java,
-        ]
+        self._sandbox_manager = None
+
+        if getattr(computer.interpreter, "sandbox_mode", False):
+            from .languages.sandbox import SandboxPython, SandboxShell, SandboxJavaScript
+            from .languages.sandbox.sandbox_manager import SandboxManager
+
+            self._sandbox_manager = SandboxManager(
+                api_key=getattr(computer.interpreter, "sandbox_api_key", None),
+                domain=getattr(computer.interpreter, "sandbox_domain", None),
+            )
+            self.languages = [
+                Ruby,
+                SandboxPython,
+                SandboxShell,
+                SandboxJavaScript,
+                HTML,
+                AppleScript,
+                R,
+                PowerShell,
+                React,
+                Java,
+            ]
+        else:
+            self.languages = [
+                Ruby,
+                Python,
+                Shell,
+                JavaScript,
+                HTML,
+                AppleScript,
+                R,
+                PowerShell,
+                React,
+                Java,
+            ]
+
         self._active_languages = {}
 
     def sudo_install(self, package):
@@ -88,7 +112,7 @@ def run(self, language, code, stream=False, display=False):
             else:
                 return [{"type": "console", "format": "output", "content": f"Failed to install package {package}."}]
 
-        if language == "python":
+        if language == "python" and not self._sandbox_manager:
             if (
                 self.computer.import_computer_api
                 and not self.computer._has_imported_computer_api
@@ -155,10 +179,10 @@ def run(self, language, code, stream=False, display=False):
 
     def _streaming_run(self, language, code, display=False):
         if language not in self._active_languages:
-            # Get the language. Pass in self.computer *if it takes a single argument*
-            # but pass in nothing if not. This makes custom languages easier to add / understand.
             lang_class = self.get_language(language)
-            if lang_class.__init__.__code__.co_argcount > 1:
+            if hasattr(lang_class, '_is_sandbox_language') and lang_class._is_sandbox_language:
+                self._active_languages[language] = lang_class(self._sandbox_manager)
+            elif lang_class.__init__.__code__.co_argcount > 1:
                 self._active_languages[language] = lang_class(self.computer)
             else:
                 self._active_languages[language] = lang_class()
@@ -205,3 +229,6 @@ def terminate(self):
             ):  # Not sure why this is None sometimes. We should look into this
                 language.terminate()
             del self._active_languages[language_name]
+
+        if self._sandbox_manager:
+            self._sandbox_manager.terminate()
diff --git a/interpreter/core/core.py b/interpreter/core/core.py
index b964b745f9..d9406f3de5 100644
--- a/interpreter/core/core.py
+++ b/interpreter/core/core.py
@@ -80,6 +80,9 @@ def __init__(
         multi_line=True,
         contribute_conversation=False,
         plain_text_display=False,
+        sandbox_mode=False,
+        sandbox_api_key=None,
+        sandbox_domain=None,
     ):
         # State
         self.messages = [] if messages is None else messages
@@ -101,6 +104,11 @@ def __init__(
         self.plain_text_display = plain_text_display
         self.highlight_active_line = True  # additional setting to toggle active line highlighting. Defaults to True
 
+        # Sandbox settings
+        self.sandbox_mode = sandbox_mode
+        self.sandbox_api_key = sandbox_api_key
+        self.sandbox_domain = sandbox_domain
+
         # Loop messages
         self.loop = loop
         self.loop_message = loop_message
diff --git a/interpreter/terminal_interface/start_terminal_interface.py b/interpreter/terminal_interface/start_terminal_interface.py
index 60dadc902a..28a800189d 100644
--- a/interpreter/terminal_interface/start_terminal_interface.py
+++ b/interpreter/terminal_interface/start_terminal_interface.py
@@ -245,6 +245,28 @@ def start_terminal_interface(interpreter):
             "help_text": "experimentally let Open Interpreter control your mouse and keyboard (shortcut for `interpreter --profile os`)",
             "type": bool,
         },
+        # Sandbox settings
+        {
+            "name": "sandbox",
+            "nickname": "sb",
+            "help_text": "run code in a secure OpenSandbox container instead of locally",
+            "type": bool,
+            "attribute": {"object": interpreter, "attr_name": "sandbox_mode"},
+        },
+        {
+            "name": "sandbox_api_key",
+            "nickname": "sbk",
+            "help_text": "API key for OpenSandbox (or set OPEN_SANDBOX_API_KEY env var)",
+            "type": str,
+            "attribute": {"object": interpreter, "attr_name": "sandbox_api_key"},
+        },
+        {
+            "name": "sandbox_domain",
+            "nickname": "sbd",
+            "help_text": "domain for OpenSandbox server (or set OPEN_SANDBOX_DOMAIN env var)",
+            "type": str,
+            "attribute": {"object": interpreter, "attr_name": "sandbox_domain"},
+        },
         # Special commands
         {
             "name": "reset_profile",
diff --git a/pyproject.toml b/pyproject.toml
index 7e9c403c20..49f8f540ea 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,6 +35,10 @@ easyocr = { version = "^1.7.1", optional = true }
 # Optional [server] dependencies
 janus = { version = "^1.0.0", optional = true }
 
+# Optional [sandbox] dependencies
+opensandbox = { version = ">=0.1.0", optional = true }
+opensandbox-code-interpreter = { version = ">=0.1.0", optional = true }
+
 # Required dependencies
 python = ">=3.9,<3.13"
 setuptools = "*"
@@ -77,6 +81,7 @@ os = ["opencv-python", "pyautogui", "plyer", "pywinctl", "pytesseract", "sentenc
 safe = ["semgrep"]
 local = ["opencv-python", "pytesseract", "torch", "transformers", "einops", "torchvision", "easyocr"]
 server = ["fastapi", "janus", "uvicorn"]
+sandbox = ["opensandbox", "opensandbox-code-interpreter"]
 
 [tool.poetry.group.dev.dependencies]
 black = "^23.10.1"