feat: add Pi coding agent integration guide

apps/docs/content/guides/pi.mdx

@@ -0,0 +1,177 @@
+---
+title: Pi Integration
+description: Use any model with Pi coding agent through LLM Gateway — GPT-5.5, Gemini, Claude, DeepSeek, and 200+ others in your terminal.
+image: guides/pi/config.png
+icon: Terminal
+---
+
+import { Step, Steps } from "fumadocs-ui/components/steps";
+import { Callout } from "fumadocs-ui/components/callout";
+
+[Pi](https://pi.dev) is a minimal terminal-based coding agent that gives an AI full access to read, write, edit, and run shell commands in your project. By pointing Pi at LLM Gateway, you can use any of our 200+ models — GPT-5.5, Gemini 3.1 Pro, Claude Opus 4.7, DeepSeek V4, and more — with full cost tracking and caching.
+
+## Prerequisites
+
+- An LLM Gateway account with an API key
+- Pi installed (`curl -fsSL https://pi.dev/install.sh | bash`)
+- Basic terminal familiarity
+
+## Setup
+
+Pi uses a `models.json` configuration file to define providers and models. We'll add LLM Gateway as a custom provider.
+
+<Steps>
+<Step>
+### Get Your API Key
+
+1. Log in to your [LLM Gateway dashboard](https://llmgateway.io/dashboard)
+2. Navigate to **API Keys** section
+3. Create a new API key and copy the key
+
+</Step>
+
+<Step>
+### Configure Pi
+
+Open (or create) the Pi models configuration file at `~/.pi/agent/models.json` and add LLM Gateway as a provider:
+
+```json
+{
+	"providers": {
+		"llmgateway": {
+			"baseUrl": "https://api.llmgateway.io/v1",
+			"api": "openai-completions",
+			"apiKey": "llmgtwy_your_api_key_here",
+			"models": [
+				{ "id": "gpt-5.5", "name": "GPT-5.5" },
+				{ "id": "claude-opus-4-7", "name": "Claude Opus 4.7" },
+				{ "id": "gemini-3.1-pro", "name": "Gemini 3.1 Pro" },
+				{ "id": "deepseek-v4", "name": "DeepSeek V4", "reasoning": true }
+			]
+		}
+	}
+}
+```
+
+Replace `llmgtwy_your_api_key_here` with your actual API key from Step 1.
+
+![Pi models.json Configuration](/guides/pi/config.png)
+
+<Callout type="info">
+	Pi reloads `models.json` when you open the `/model` menu — no restart needed
+	after editing.
+</Callout>
+
+</Step>
+
+<Step>
+### Select Your Model
+
+1. Run `pi` in any project directory
+2. Type `/model` to open the model selector
+3. Select your LLM Gateway model from the list
+
+All requests now route through LLM Gateway with full cost tracking.
+
+</Step>
+
+<Step>
+### Test the Integration
+
+Ask Pi to do something in your project to verify everything works:
+
+```
+> hello
+```
+
+![Pi Test with LLM Gateway](/guides/pi/test.png)
+
+You should see the response streaming from your chosen model. Check your [LLM Gateway dashboard](https://llmgateway.io/dashboard) to confirm the request appears in your usage logs.
+
+</Step>
+</Steps>
+
+## Adding More Models
+
+You can add any model from the [LLM Gateway models page](https://llmgateway.io/models) to your `models.json`. Just add entries to the `models` array:
+
+```json
+{
+	"providers": {
+		"llmgateway": {
+			"baseUrl": "https://api.llmgateway.io/v1",
+			"api": "openai-completions",
+			"apiKey": "llmgtwy_your_api_key_here",
+			"models": [
+				{ "id": "gpt-5.5", "name": "GPT-5.5" },
+				{ "id": "gpt-5.5-mini", "name": "GPT-5.5 Mini" },
+				{ "id": "claude-opus-4-7", "name": "Claude Opus 4.7" },
+				{ "id": "claude-sonnet-4-6", "name": "Claude Sonnet 4.6" },
+				{ "id": "gemini-3.1-pro", "name": "Gemini 3.1 Pro" },
+				{ "id": "gemini-3.1-flash", "name": "Gemini 3.1 Flash" },
+				{ "id": "deepseek-v4", "name": "DeepSeek V4", "reasoning": true },
+				{
+					"id": "deepseek-v4-mini",
+					"name": "DeepSeek V4 Mini",
+					"reasoning": true
+				}
+			]
+		}
+	}
+}
+```
+
+## Using Environment Variables for the API Key
+
+Instead of hardcoding your key, you can reference an environment variable:
+
+```json
+{
+	"providers": {
+		"llmgateway": {
+			"baseUrl": "https://api.llmgateway.io/v1",
+			"api": "openai-completions",
+			"apiKey": "LLM_GATEWAY_API_KEY",
+			"models": [{ "id": "gpt-5.5", "name": "GPT-5.5" }]
+		}
+	}
+}
+```
+
+Then set the variable in your shell profile:
+
+```bash
+export LLM_GATEWAY_API_KEY=llmgtwy_your_api_key_here
+```
+
+## Troubleshooting
+
+### Authentication Errors
+
+- Verify your API key is correct in `~/.pi/agent/models.json`
+- Check that the base URL is set to `https://api.llmgateway.io/v1`
+- Ensure your LLM Gateway account has sufficient credits
+
+### Model Not Found
+
+- Verify the model ID exists on the [models page](https://llmgateway.io/models)
+- Model IDs are case-sensitive — copy them exactly as shown
+
+### Connection Issues
+
+- Check your internet connection
+- Ensure `api` is set to `"openai-completions"` (not `"openai-responses"`)
+- Monitor your usage in the LLM Gateway dashboard
+
+<Callout type="info">
+	Need help? Join our [Discord community](https://llmgateway.io/discord) for
+	support and troubleshooting assistance.
+</Callout>
+
+## Benefits of Using LLM Gateway with Pi
+
+- **Any Model**: Use GPT-5.5, Claude Opus 4.7, Gemini 3.1 Pro, DeepSeek V4, or 200+ others
+- **Cost Tracking**: Every Pi request appears in your dashboard with token counts and costs
+- **Caching**: Repeated requests hit cache automatically, saving money
+- **One Key**: Manage all providers through a single API key
+- **No Vendor Lock-in**: Switch models by changing one line in your config

apps/ui/src/components/integrations/integration-cards.tsx

@@ -17,6 +17,7 @@ import {
 	KiloCodeIcon,
 	N8nIcon,
 	OpenCodeIcon,
+	PiIcon,
 	VSCodeIcon,
 } from "@llmgateway/shared/components";
 
@@ -131,6 +132,14 @@ const integrations: Integration[] = [
 		icon: OpenClawIcon,
 		comingSoon: false,
 	},
+	{
+		name: "Pi",
+		description:
+			"Use LLM Gateway with Pi coding agent for AI-powered terminal coding with any model.",
+		href: "/guides/pi",
+		icon: PiIcon,
+		comingSoon: false,
+	},
 	{
 		name: "VS Code",
 		description:

apps/ui/src/content/guides/pi.md

@@ -0,0 +1,71 @@
+---
+id: pi
+slug: pi
+title: Pi Coding Agent Integration
+description: Use any model with Pi coding agent through LLM Gateway — GPT-5.5, Gemini 3.1 Pro, Claude Opus 4.7, DeepSeek V4, and 200+ others in your terminal.
+date: 2026-05-13
+---
+
+[Pi](https://pi.dev) is a minimal terminal-based coding agent that gives an AI full access to read, write, edit, and run shell commands in your project. By pointing Pi at LLM Gateway, you can use any of our 200+ models with full cost tracking and caching.
+
+## Quick Start
+
+Configure Pi to use LLM Gateway by editing `~/.pi/agent/models.json`:
+
+```json
+{
+  "providers": {
+    "llmgateway": {
+      "baseUrl": "https://api.llmgateway.io/v1",
+      "api": "openai-completions",
+      "apiKey": "llmgtwy_your_api_key_here",
+      "models": [
+        { "id": "gpt-5.5", "name": "GPT-5.5" },
+        { "id": "claude-opus-4-7", "name": "Claude Opus 4.7" },
+        { "id": "gemini-3.1-pro", "name": "Gemini 3.1 Pro" },
+        { "id": "deepseek-v4", "name": "DeepSeek V4", "reasoning": true }
+      ]
+    }
+  }
+}
+```
+
+Then run `pi` in any project directory and type `/model` to select your LLM Gateway model.
+
+## Setup Steps
+
+1. **Get Your API Key** — Log in to your [LLM Gateway dashboard](https://llmgateway.io/dashboard) and create a new API key
+2. **Edit models.json** — Add the LLM Gateway provider config shown above to `~/.pi/agent/models.json`
+3. **Select Model** — Run `pi`, type `/model`, and pick your model
+4. **Start Coding** — All requests route through LLM Gateway with full cost tracking
+
+## Adding More Models
+
+Add any model from the [models page](https://llmgateway.io/models) to the `models` array in your config:
+
+```json
+{ "id": "gpt-5.5-mini", "name": "GPT-5.5 Mini" },
+{ "id": "claude-sonnet-4-6", "name": "Claude Sonnet 4.6" },
+{ "id": "gemini-3.1-flash", "name": "Gemini 3.1 Flash" },
+{ "id": "deepseek-v4-mini", "name": "DeepSeek V4 Mini", "reasoning": true }
+```
+
+## Using Environment Variables
+
+Reference an env var instead of hardcoding your key:
+
+```json
+"apiKey": "LLM_GATEWAY_API_KEY"
+```
+
+```bash
+export LLM_GATEWAY_API_KEY=llmgtwy_your_api_key_here
+```
+
+## Troubleshooting
+
+- **Auth errors**: Verify API key and base URL (`https://api.llmgateway.io/v1`)
+- **Model not found**: Copy model IDs exactly from the [models page](https://llmgateway.io/models)
+- **Connection issues**: Ensure `api` is set to `"openai-completions"`
+
+Need help? Join our [Discord community](https://llmgateway.io/discord).

packages/shared/src/components/integration-icons.tsx

@@ -304,3 +304,19 @@ export const KiloCodeIcon: React.FC<React.SVGProps<SVGSVGElement>> = (
 		/>
 	</svg>
 );
+
+// Pi Icon
+export const PiIcon: React.FC<React.SVGProps<SVGSVGElement>> = (props) => (
+	<svg
+		xmlns="http://www.w3.org/2000/svg"
+		viewBox="0 0 800 800"
+		fill="currentColor"
+		{...props}
+	>
+		<path
+			fillRule="evenodd"
+			d="M165.29 165.29H517.36V400H400V517.36H282.65V634.72H165.29ZM282.65 282.65V400H400V282.65Z"
+		/>
+		<path d="M517.36 400H634.72V634.72H517.36Z" />
+	</svg>
+);