diff --git a/cookbook/ai_coding_tool_guides/claude_code_quickstart/guide.md b/cookbook/ai_coding_tool_guides/claude_code_quickstart/guide.md
index ad86c2b7b1..3d6c75498b 100644
--- a/cookbook/ai_coding_tool_guides/claude_code_quickstart/guide.md
+++ b/cookbook/ai_coding_tool_guides/claude_code_quickstart/guide.md
@@ -97,17 +97,75 @@ export ANTHROPIC_AUTH_TOKEN="$LITELLM_MASTER_KEY"
 
 ## Step 5: Use Claude Code
 
-Start Claude Code and it will automatically use your configured models:
+### Choosing Your Model
+
+You have two options for specifying which model Claude Code uses:
+
+#### Option 1: Command Line / Session Model Selection
+
+Specify the model directly when starting Claude Code or during a session:
 
 ```bash
-# Claude Code will use the models configured in your LiteLLM proxy
-claude
-
-# Or specify a model if you have multiple configured
+# Specify model at startup
 claude --model claude-3-5-sonnet-20241022
-claude --model claude-3-5-haiku-20241022
+
+# Or change model during a session
+/model claude-3-5-haiku-20241022
 ```
 
+This method uses the exact model you specify.
+
+#### Option 2: Environment Variables
+
+Configure default models using environment variables:
+
+```bash
+# Tell Claude Code which models to use by default
+export ANTHROPIC_DEFAULT_SONNET_MODEL=claude-3-5-sonnet-20241022
+export ANTHROPIC_DEFAULT_HAIKU_MODEL=claude-3-5-haiku-20241022
+export ANTHROPIC_DEFAULT_OPUS_MODEL=claude-opus-3-5-20240229
+
+claude  # Will use the models specified above
+```
+
+**Note:** Claude Code may cache the model from a previous session. If environment variables don't take effect, use Option 1 to explicitly set the model.
+
+**Important:** The `model_name` in your LiteLLM config must match what Claude Code requests (either from env vars or command line).
+
+### Using 1M Context Window
+
+Claude Code supports extended context (1 million tokens) using the `[1m]` suffix with Claude 4+ models:
+
+```bash
+# Use Sonnet 4.5 with 1M context (requires quotes for shell)
+claude --model 'claude-sonnet-4-5-20250929[1m]'
+
+# Inside a Claude Code session (no quotes needed)
+/model claude-sonnet-4-5-20250929[1m]
+```
+
+**Important:** When using `--model` with `[1m]` in the shell, you must use quotes to prevent the shell from interpreting the brackets.
+
+Alternatively, set as default with environment variables:
+
+```bash
+export ANTHROPIC_DEFAULT_SONNET_MODEL='claude-sonnet-4-5-20250929[1m]'
+claude
+```
+
+**How it works:**
+- Claude Code strips the `[1m]` suffix before sending to LiteLLM
+- Claude Code automatically adds the header `anthropic-beta: context-1m-2025-08-07`
+- Your LiteLLM config should **NOT** include `[1m]` in model names
+
+**Verify 1M context is active:**
+```bash
+/context
+# Should show: 21k/1000k tokens (2%)
+```
+
+**Pricing:** Models using 1M context have different pricing. Input tokens above 200k are charged at a higher rate.
+
 ## Troubleshooting
 
 Common issues and solutions:
@@ -123,18 +181,25 @@ Common issues and solutions:
 - Ensure the `ANTHROPIC_AUTH_TOKEN` matches your LiteLLM master key
 
 **Model not found:**
-- Ensure the model name in Claude Code matches exactly with your `config.yaml`
-- Check LiteLLM logs for detailed error messages
+- Check what model Claude Code is requesting in LiteLLM logs
+- Ensure your `config.yaml` has a matching `model_name` entry
+- If using environment variables, verify they're set: `echo $ANTHROPIC_DEFAULT_SONNET_MODEL`
+
+**1M context not working (showing 200k instead of 1000k):**
+- Verify you're using the `[1m]` suffix: `/model your-model-name[1m]`
+- Check LiteLLM logs for the header `context-1m-2025-08-07` in the request
+- Ensure your model supports 1M context (only certain Claude models do)
+- Your LiteLLM config should **NOT** include `[1m]` in the `model_name`
 
 ## Using Multiple Models and Providers
 
-Expand your configuration to support multiple providers and models:
+You can configure LiteLLM to route to any supported provider. Here's an example with multiple providers:
 
 ```yaml
 model_list:
   # OpenAI models
   - model_name: codex-mini
-    litellm_params:  
+    litellm_params:
       model: openai/codex-mini
       api_key: os.environ/OPENAI_API_KEY
       api_base: https://api.openai.com/v1
@@ -156,7 +221,7 @@ model_list:
     litellm_params:
       model: anthropic/claude-3-5-sonnet-20241022
       api_key: os.environ/ANTHROPIC_API_KEY
-  
+
   - model_name: claude-3-5-haiku-20241022
     litellm_params:
       model: anthropic/claude-3-5-haiku-20241022
@@ -174,19 +239,54 @@ litellm_settings:
   master_key: os.environ/LITELLM_MASTER_KEY
 ```
 
+**Note:** The `model_name` can be anything you choose. Claude Code will request whatever model you specify (via env vars or command line), and LiteLLM will route to the `model` configured in `litellm_params`.
+
 Switch between models seamlessly:
 
 ```bash
-# Use Claude for complex reasoning
-claude --model claude-3-5-sonnet-20241022
+# Use environment variables to set defaults
+export ANTHROPIC_DEFAULT_SONNET_MODEL=claude-3-5-sonnet-20241022
+export ANTHROPIC_DEFAULT_HAIKU_MODEL=claude-3-5-haiku-20241022
 
-# Use Haiku for fast responses
-claude --model claude-3-5-haiku-20241022
-
-# Use Bedrock deployment
-claude --model claude-bedrock
+# Or specify directly
+claude --model claude-3-5-sonnet-20241022  # Complex reasoning
+claude --model claude-3-5-haiku-20241022    # Fast responses
+claude --model claude-bedrock                # Bedrock deployment
 ```
 
+## Default Models Used by Claude Code
+
+If you **don't** set environment variables, Claude Code uses these default model names:
+
+| Purpose | Default Model Name (v2.1.14) |
+|---------|------------------------------|
+| Main model | `claude-sonnet-4-5-20250929` |
+| Light tasks (subagents, summaries) | `claude-haiku-4-5-20251001` |
+| Planning mode | `claude-opus-4-5-20251101` |
+
+Your LiteLLM config should include these model names if you want Claude Code to work without setting environment variables:
+
+```yaml
+model_list:
+  - model_name: claude-sonnet-4-5-20250929
+    litellm_params:
+      # Can be any provider - Anthropic, Bedrock, Vertex AI, etc.
+      model: anthropic/claude-sonnet-4-5-20250929
+      api_key: os.environ/ANTHROPIC_API_KEY
+
+  - model_name: claude-haiku-4-5-20251001
+    litellm_params:
+      model: anthropic/claude-haiku-4-5-20251001
+      api_key: os.environ/ANTHROPIC_API_KEY
+
+  - model_name: claude-opus-4-5-20251101
+    litellm_params:
+      model: anthropic/claude-opus-4-5-20251101
+      api_key: os.environ/ANTHROPIC_API_KEY
+```
+
+**Warning:** These default model names may change with new Claude Code versions. Check LiteLLM proxy logs for "model not found" errors to identify what Claude Code is requesting.
+
 ## Additional Resources
 
 - [LiteLLM Documentation](https://docs.litellm.ai/)
diff --git a/docs/my-website/docs/tutorials/claude_responses_api.md b/docs/my-website/docs/tutorials/claude_responses_api.md
index 6b681d93a8..03ac9935fd 100644
--- a/docs/my-website/docs/tutorials/claude_responses_api.md
+++ b/docs/my-website/docs/tutorials/claude_responses_api.md
@@ -37,18 +37,22 @@ Create a secure configuration using environment variables:
 
 ```yaml
 model_list:
-  # Claude models
-  - model_name: claude-3-5-sonnet-20241022    
+  # Configure the models you want to use
+  - model_name: claude-sonnet-4-5-20250929
     litellm_params:
-      model: anthropic/claude-3-5-sonnet-20241022
-      api_key: os.environ/ANTHROPIC_API_KEY
-  
-  - model_name: claude-3-5-haiku-20241022
-    litellm_params:
-      model: anthropic/claude-3-5-haiku-20241022
+      model: anthropic/claude-sonnet-4-5-20250929
+      api_key: os.environ/ANTHROPIC_API_KEY
+
+  - model_name: claude-haiku-4-5-20251001
+    litellm_params:
+      model: anthropic/claude-haiku-4-5-20251001
+      api_key: os.environ/ANTHROPIC_API_KEY
+
+  - model_name: claude-opus-4-5-20251101
+    litellm_params:
+      model: anthropic/claude-opus-4-5-20251101
       api_key: os.environ/ANTHROPIC_API_KEY
 
-  
 litellm_settings:
   master_key: os.environ/LITELLM_MASTER_KEY
 ```
@@ -60,6 +64,10 @@ export ANTHROPIC_API_KEY="your-anthropic-api-key"
 export LITELLM_MASTER_KEY="sk-1234567890"  # Generate a secure key
 ```
 
+:::tip
+Alternatively, you can store `ANTHROPIC_API_KEY` in a `.env` file in your proxy directory. LiteLLM will automatically load it when starting.
+:::
+
 ### 2. Start proxy
 
 ```bash
@@ -111,15 +119,55 @@ export ANTHROPIC_AUTH_TOKEN="$LITELLM_MASTER_KEY"
 
 ### 5. Use Claude Code
 
-Start Claude Code and it will automatically use your configured models:
+Start Claude Code with the model you want to use:
 
 ```bash
-# Claude Code will use the models configured in your LiteLLM proxy
-claude
+# Specify model at startup
+claude --model claude-sonnet-4-5-20250929
 
-# Or specify a model if you have multiple configured
-claude --model claude-3-5-sonnet-20241022
-claude --model claude-3-5-haiku-20241022
+# Or specify a different model
+claude --model claude-haiku-4-5-20251001
+claude --model claude-opus-4-5-20251101
+
+# Or change model during a session
+claude
+/model claude-sonnet-4-5-20250929
+```
+
+Alternatively, set default models with environment variables:
+
+```bash
+export ANTHROPIC_DEFAULT_SONNET_MODEL=claude-sonnet-4-5-20250929
+export ANTHROPIC_DEFAULT_HAIKU_MODEL=claude-haiku-4-5-20251001
+export ANTHROPIC_DEFAULT_OPUS_MODEL=claude-opus-4-5-20251101
+claude
+```
+
+### Using 1M Context Window
+
+Claude Code supports extended context (1 million tokens) using the `[1m]` suffix:
+
+```bash
+# Use Sonnet with 1M context (requires quotes in shell)
+claude --model 'claude-sonnet-4-5-20250929[1m]'
+
+# Inside a Claude Code session (no quotes needed)
+/model claude-sonnet-4-5-20250929[1m]
+```
+
+:::warning
+**Important:** When using `--model` with `[1m]` in the shell, you must use quotes to prevent the shell from interpreting the brackets.
+:::
+
+**How it works:**
+- Claude Code strips the `[1m]` suffix before sending to LiteLLM
+- Claude Code automatically adds the header `anthropic-beta: context-1m-2025-08-07`
+- Your LiteLLM config should **NOT** include `[1m]` in model names
+
+**Verify 1M context is active:**
+```bash
+/context
+# Should show: 21k/1000k tokens (2%)
 ```
 
 Example conversation:
@@ -140,6 +188,7 @@ Common issues and solutions:
 
 **Model not found:**
 - Ensure the model name in Claude Code matches exactly with your `config.yaml`
+- Use `--model` flag or environment variables to specify the model
 - Check LiteLLM logs for detailed error messages
 
 ## Using Bedrock/Vertex AI/Azure Foundry Models