Create ANDROID_INSTALL.md

Installation Guide to run OpenClaude on andriod

ANDROID_INSTALL.md

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+# OpenClaude on Android (Termux)
+
+A complete guide to running OpenClaude on Android using Termux + proot Ubuntu.
+
+---
+
+## Prerequisites
+
+- Android phone with ~700MB free storage
+- [Termux](https://f-droid.org/en/packages/com.termux/) installed from **F-Droid** (not Play Store)
+- An [OpenRouter](https://openrouter.ai) API key (free, no credit card required)
+
+---
+
+## Why This Setup?
+
+OpenClaude requires [Bun](https://bun.sh) to build, and Bun does not support Android natively. The workaround is running a real Ubuntu environment inside Termux via `proot-distro`, where Bun's Linux binary works correctly.
+
+---
+
+## Installation
+
+### Step 1 — Update Termux
+
+```bash
+pkg update && pkg upgrade
+```
+
+Press `N` or Enter for any config file conflict prompts.
+
+### Step 2 — Install dependencies
+
+```bash
+pkg install nodejs-lts git proot-distro
+```
+
+Verify Node.js:
+```bash
+node --version  # should be v20+
+```
+
+### Step 3 — Clone OpenClaude
+
+```bash
+git clone https://github.com/Gitlawb/openclaude.git
+cd openclaude
+npm install
+npm link
+```
+
+### Step 4 — Install Ubuntu via proot
+
+```bash
+proot-distro install ubuntu
+```
+
+This downloads ~200–400MB. Wait for it to complete.
+
+### Step 5 — Install Bun inside Ubuntu
+
+```bash
+proot-distro login ubuntu
+curl -fsSL https://bun.sh/install | bash
+source ~/.bashrc
+bun --version  # should show 1.3.11+
+```
+
+### Step 6 — Build OpenClaude
+
+```bash
+cd /data/data/com.termux/files/home/openclaude
+bun run build
+```
+
+You should see:
+```
+✓ Built openclaude v0.1.6 → dist/cli.mjs
+```
+
+### Step 7 — Save env vars permanently
+
+Still inside Ubuntu, add your OpenRouter config to `.bashrc`:
+
+```bash
+echo 'export CLAUDE_CODE_USE_OPENAI=1' >> ~/.bashrc
+echo 'export OPENAI_API_KEY=your_openrouter_key_here' >> ~/.bashrc
+echo 'export OPENAI_BASE_URL=https://openrouter.ai/api/v1' >> ~/.bashrc
+echo 'export OPENAI_MODEL=qwen/qwen3.6-plus-preview:free' >> ~/.bashrc
+source ~/.bashrc
+```
+
+Replace `your_openrouter_key_here` with your actual key from [openrouter.ai/keys](https://openrouter.ai/keys).
+
+### Step 8 — Run OpenClaude
+
+```bash
+node dist/cli.mjs
+```
+
+Select **3** (3rd-party platform) at the login screen. Your env vars will be detected automatically.
+
+---
+
+## Restarting After Closing Termux
+
+Every time you reopen Termux after killing it, run:
+
+```bash
+proot-distro login ubuntu
+cd /data/data/com.termux/files/home/openclaude
+node dist/cli.mjs
+```
+
+---
+
+## Recommended Free Model
+
+**`qwen/qwen3.6-plus-preview:free`** — Best free model on OpenRouter as of April 2026.
+
+- 1M token context window
+- Beats Claude 4.5 Opus on Terminal-Bench 2.0 agentic coding (61.6 vs 59.3)
+- Built-in chain-of-thought reasoning
+- Native tool use and function calling
+- $0/M tokens (preview period)
+
+> ⚠️ Free status may change when the preview period ends. Check [openrouter.ai](https://openrouter.ai/qwen/qwen3.6-plus-preview:free) for current pricing.
+
+---
+
+## Alternative Free Models (OpenRouter)
+
+| Model ID | Context | Notes |
+|---|---|---|
+| `qwen/qwen3-coder:free` | 262K | Best for pure coding tasks |
+| `openai/gpt-oss-120b:free` | 131K | OpenAI open model, strong tool calling |
+| `nvidia/nemotron-3-super-120b-a12b:free` | 262K | Hybrid MoE, good general use |
+| `meta-llama/llama-3.3-70b-instruct:free` | 66K | Reliable, widely tested |
+
+Switch models anytime:
+```bash
+export OPENAI_MODEL=qwen/qwen3-coder:free
+node dist/cli.mjs
+```
+
+---
+
+## Why Not Groq or Cerebras?
+
+Both were tested and fail due to OpenClaude's large system prompt (~50K tokens):
+
+- **Groq free tier**: TPM limits too low (6K–12K tokens/min)
+- **Cerebras free tier**: TPM limits exceeded, even on `llama3.1-8b`
+
+OpenRouter free models have no TPM restrictions — only 20 req/min and 200 req/day.
+
+---
+
+## Tips
+
+- **Don't swipe Termux away** from recent apps mid-session — use the home button to minimize instead.
+- The Ubuntu environment persists between Termux sessions; your build and config are saved.
+- Run `bun run build` again only if you pull updates to the OpenClaude repo.