diff --git a/gptme/tools/think.py b/gptme/tools/think.py
new file mode 100644
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+++ b/gptme/tools/think.py
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+"""
+This tool enables deeper thinking on complex problems by sending requests to more powerful LLMs.
+
+The tool allows the assistant to request help with complex reasoning tasks by:
+1. Sending the current context and problem to a more powerful model
+2. Getting back enhanced reasoning and analysis
+3. Using that to provide better solutions
+"""
+
+# TODO: Implement Karpathy-style consortium
+# - Send the same problem to multiple models
+# - Aggregate and compare their responses
+# - Use voting/consensus mechanisms
+# - Consider different specialties/capabilities
+
+import logging
+import time
+from collections.abc import Generator
+
+from ..llm import reply
+from ..llm.models import get_model
+from ..message import Message
+from .base import ConfirmFunc, Parameter, ToolSpec
+
+logger = logging.getLogger(__name__)
+
+
+def execute(
+    code: str | None,
+    args: list[str] | None,
+    kwargs: dict[str, str] | None,
+    confirm: ConfirmFunc,
+) -> Generator[Message, None, None]:
+    """Execute the think tool with the given content."""
+    if not code:
+        yield Message("system", "No content provided for thinking")
+        return
+
+    default_model = "openai/o1-preview"
+
+    # Get current model
+    current_model = get_model()
+
+    # Use specialized reasoning models if available
+    # TODO: choose reasoner based on provider, similar to summary models
+    if kwargs and (m := kwargs.get("model")):
+        model = m
+    elif args and len(args) == 1:
+        model = args[0].split("=", 1)[-1]
+    else:
+        model = default_model
+
+    reasoning_model = get_model(model)
+
+    if reasoning_model.model == current_model.model:
+        logger.warning(
+            "No more powerful model available for reasoning, using current model"
+        )
+
+    # Extract any referenced files from the content
+    files_content = ""
+    files_block = False
+    for line in code.split("\n"):
+        if line.strip().startswith("Files:"):
+            files_block = True
+            continue
+        if not files_block:
+            continue
+        if line.strip().startswith("- "):
+            filepath = line.strip("- ").strip()
+            # check for (comment) suffix after path
+            if filepath.endswith(")") and " (" in filepath:
+                filepath = filepath.split(" (")[0].strip()
+            try:
+                with open(filepath) as f:
+                    files_content += (
+                        f"\nContents of {filepath}:\n```\n{f.read()}\n```\n"
+                    )
+            except Exception as e:
+                logger.warning(f"Failed to read file {filepath}: {e}")
+        else:
+            files_block = False
+
+    # Combine file contents with the thinking request
+    if files_content:
+        full_content = files_content + "\n" + code
+    else:
+        full_content = code
+
+    # Prepare thinking prompt
+    thinking_prompt = f"""Please analyze this problem carefully and thoroughly:
+
+{full_content}
+
+Think step by step and consider:
+1. Key aspects and components
+2. Potential challenges and edge cases
+3. Alternative approaches
+4. Best practices and principles
+5. Implementation details"""
+
+    # Log that we're using a different model for thinking
+    logger.info(f"Using {reasoning_model.full} for enhanced reasoning")
+
+    # Get enhanced reasoning
+    messages = [Message("user", thinking_prompt)]
+    start = time.monotonic()
+    response = reply(messages, reasoning_model.full, stream=False)
+    logger.info(f"Thought for {time.monotonic() - start:.2f}s")
+
+    # Return the enhanced reasoning
+    yield Message(
+        "system",
+        f"Enhanced reasoning from {reasoning_model.model}:\n\n{response.content}",
+    )
+
+
+tool = ToolSpec(
+    "think",
+    desc="Tool to enable deeper thinking on challenging or complex problems.",
+    block_types=["think"],
+    execute=execute,
+    instructions="""
+Use this tool when you need help with complex reasoning or problem-solving.
+Wrap your thinking request in a code block with the language tag: `think`
+
+IMPORTANT: You must include relevant files under a "Files:" section, as state is not preserved between calls.
+The tool will read and include the contents of listed files in the analysis.
+
+The tool will:
+1. Send your request (and file contents) to a more powerful model
+2. Get back enhanced reasoning and analysis
+3. Help you provide better solutions
+
+You can specify the model using the `model` parameter.
+
+Example:
+```think model=openai/o1-preview
+How should we architect this system to be scalable and maintainable?
+Key considerations:
+- Multiple users
+- Real-time updates
+- Data consistency
+- Error handling
+
+Files:
+- README.md (project overview and requirements)
+- src/api.py (current API implementation)
+- docs/architecture.md (existing architecture docs)
+```
+
+Note: Always include relevant files, as the tool cannot access files from previous calls.
+""",
+    parameters=[
+        Parameter(
+            "model",
+            type="string",
+            description="Model to use for enhanced reasoning (i.e. o1-preview)",
+            required=False,
+        )
+    ],
+)