diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d2323ee..aca8536 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -33,7 +33,7 @@ jobs:
     - name: Run tests
       run: make test
       env:
-        ENV: CI
+        AWE_ENV: CI
 
   format-fix:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/version.yml b/.github/workflows/version.yml
index 19e3549..d5019c5 100644
--- a/.github/workflows/version.yml
+++ b/.github/workflows/version.yml
@@ -100,7 +100,7 @@ jobs:
       if: steps.version.outputs.skipped != 'true'
       run: make test
       env:
-        ENV: CI
+        AWE_ENV: CI
 
     - name: Run linting
       if: steps.version.outputs.skipped != 'true'
diff --git a/README.md b/README.md
index 73870a1..30083fa 100644
--- a/README.md
+++ b/README.md
@@ -36,10 +36,28 @@ uv run ruff check --select I
 Copy `.env.example` to `.env` and adjust the values:
 
 ```env
-ENV=DEV
-LOG_LEVEL=INFO
+# Environment setting (DEV, STAGING, PROD, CI)
+AWE_ENV=DEV
+
+# Logging level (DEBUG, INFO, WARNING, ERROR, CRITICAL)
+AWE_LOG_LEVEL=INFO
+
+# Optional: LLM Provider configuration
+# Options: openai, togetherai, deepseek
+AWE_LLM_PROVIDER=openai
+
+# Optional: LLM Model to use
+# Example: gpt-4, gpt-3.5-turbo, etc.
+AWE_LLM_MODEL=gpt-4
 ```
 
+### Configuration Options
+
+- **`AWE_ENV`**: Application environment (default: `DEV`)
+- **`AWE_LOG_LEVEL`**: Logging verbosity level (default: `INFO`)
+- **`AWE_LLM_PROVIDER`**: Optional LLM provider selection. If not set, must be specified when creating agents
+- **`AWE_LLM_MODEL`**: Optional default model to use. If not set, must be specified when creating agents
+
 ## New Features
 
 To develop a new feature:
diff --git a/src/aiwebexplorer/agent_factory.py b/src/aiwebexplorer/agent_factory.py
index 832af8f..bc48d7d 100644
--- a/src/aiwebexplorer/agent_factory.py
+++ b/src/aiwebexplorer/agent_factory.py
@@ -8,6 +8,8 @@
 
 from aiwebexplorer.interfaces import IAgent
 
+from .config import config
+
 T = TypeVar("T")
 
 ModelProvider = Literal[
@@ -81,9 +83,9 @@ def get_agent(
     name: str,
     instructions: list[str],
     *,
-    model_id: str | None = None,
+    model_id: str | None = config.AWE_LLM_MODEL,
     api_key: str | None = None,
-    provider: ModelProvider | None = None,
+    provider: ModelProvider | None = config.AWE_LLM_PROVIDER,
     model_id_map: ModelIdMap | None = None,
     **kwargs: Any,
 ) -> IAgent[Any]:
diff --git a/src/aiwebexplorer/agents.py b/src/aiwebexplorer/agents.py
index e72b5a2..18e0b2e 100644
--- a/src/aiwebexplorer/agents.py
+++ b/src/aiwebexplorer/agents.py
@@ -10,7 +10,7 @@ class AgentsIds: ...
 model_id_map = {
     "togetherai": "openai/gpt-oss-20b",
     "deepseek": "chat",
-    "openai": "gpt4o",
+    "openai": "gpt-4",
 }
 
 evaluate_request_agent = get_agent_dep()(
diff --git a/src/aiwebexplorer/config.py b/src/aiwebexplorer/config.py
index 0984907..df10747 100644
--- a/src/aiwebexplorer/config.py
+++ b/src/aiwebexplorer/config.py
@@ -1,4 +1,5 @@
 from enum import StrEnum
+from typing import Literal
 
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
@@ -15,8 +16,10 @@ class Environment(StrEnum):
 class Config(BaseSettings):
     """Application settings."""
 
-    ENV: Environment = Environment.DEV
-    LOG_LEVEL: str = "INFO"  # Allowed: DEBUG, INFO, WARNING, ERROR, CRITICAL
+    AWE_ENV: Environment = Environment.DEV
+    AWE_LOG_LEVEL: str = "INFO"  # Allowed: DEBUG, INFO, WARNING, ERROR, CRITICAL
+    AWE_LLM_PROVIDER: Literal["openai", "togetherai", "deepseek"] | None = None
+    AWE_LLM_MODEL: str | None = None
 
     model_config = SettingsConfigDict(env_file=".env", env_prefix="", extra="ignore")
 
diff --git a/src/aiwebexplorer/dependencies.py b/src/aiwebexplorer/dependencies.py
index 462c3a5..c9cf0c1 100644
--- a/src/aiwebexplorer/dependencies.py
+++ b/src/aiwebexplorer/dependencies.py
@@ -13,7 +13,7 @@ def get_agent_dep() -> Callable[..., IAgent[Any]]:
     Returns:
         Callable that returns either a real agent or a mock agent based on environment.
     """
-    if config.ENV == Environment.CI:
+    if config.AWE_ENV == Environment.CI:
         # Return a function that creates a mock agent for CI environment
         def mock_agent_factory(*args: Any, **kwargs: Any) -> IAgent[Any]:
             mock_agent = Mock(spec=IAgent[Any])