Use Sider in your coding agent

Install Claude Code with Anthropic's installer (or npm install -g @anthropic-ai/claude-code with Node.js 22 or later). Then open a new terminal and check that claude --version prints a version number.

curl -fsSL https://claude.ai/install.sh | bash

irm https://claude.ai/install.ps1 | iex

Create the file ~/.claude/settings.json (on Windows %USERPROFILE%\.claude\settings.json) with the content below; the command for your system opens it in an editor (in nano, Ctrl+O and Enter save, Ctrl+X exits). If the file already exists, add these entries to it. ANTHROPIC_BASE_URL is the address without /v1: Claude Code adds /v1/messages itself.

mkdir -p ~/.claude && nano ~/.claude/settings.json

New-Item -ItemType Directory -Force "$env:USERPROFILE\.claude" | Out-Null; notepad "$env:USERPROFILE\.claude\settings.json"

{
  "env": {
    "ANTHROPIC_BASE_URL": "https://sider.ai.id",
    "ANTHROPIC_MODEL": "deepseek-4.1-unrestricted",
    "ANTHROPIC_DEFAULT_OPUS_MODEL": "deepseek-4.1-unrestricted",
    "ANTHROPIC_DEFAULT_SONNET_MODEL": "deepseek-4.1-unrestricted",
    "ANTHROPIC_DEFAULT_HAIKU_MODEL": "deepseek-4.1-unrestricted",
    "ANTHROPIC_DEFAULT_FABLE_MODEL": "deepseek-4.1-unrestricted",
    "CLAUDE_CODE_MAX_OUTPUT_TOKENS": "8192"
  },
  "disableAutoMode": "disable"
}

Keep your API key out of that file, in the environment variable ANTHROPIC_AUTH_TOKEN (Claude Code sends it as Authorization: Bearer): replace YOUR_API_KEY with your key, run the command for your system once, then close the terminal and open a new one.

echo 'export ANTHROPIC_AUTH_TOKEN="YOUR_API_KEY"' >> ~/.zshrc

echo 'export ANTHROPIC_AUTH_TOKEN="YOUR_API_KEY"' >> ~/.bashrc

setx ANTHROPIC_AUTH_TOKEN "YOUR_API_KEY"

In your project folder, start Claude Code. The first time, pick a theme, press Enter after the security notes and choose Yes, I trust this folder; there is no sign-in. Type /status: it shows Anthropic base URL https://sider.ai.id, Auth token ANTHROPIC_AUTH_TOKEN and Model deepseek-4.1-unrestricted. Then ask something. A sign-in screen means that ANTHROPIC_AUTH_TOKEN is not set in this terminal.

claude

Install the Codex CLI with OpenAI's installer (or npm install -g @openai/codex). Then open a new terminal and check that codex --version prints a version number.

curl -fsSL https://chatgpt.com/codex/install.sh | sh

powershell -ExecutionPolicy ByPass -c "irm https://chatgpt.com/codex/install.ps1 | iex"

Open ~/.codex/config.toml (on Windows %USERPROFILE%\.codex\config.toml) with the command for your system (in nano, Ctrl+O and Enter save, Ctrl+X exits) and add the settings below. If the file already has settings, put the first three lines above its first line in brackets, such as [features], and remove its own lines with the same names. base_url ends with /v1: Codex adds /responses.

mkdir -p ~/.codex && nano ~/.codex/config.toml

New-Item -ItemType Directory -Force "$env:USERPROFILE\.codex" | Out-Null; notepad "$env:USERPROFILE\.codex\config.toml"

model = "deepseek-4.1-unrestricted"
model_provider = "aiter"
web_search = "disabled"

[model_providers.aiter]
name = "Sider"
base_url = "https://sider.ai.id/v1"
env_key = "AITER_API_KEY"
wire_api = "responses"

Keep your API key out of that file, in the environment variable AITER_API_KEY that env_key names: replace YOUR_API_KEY with your key, run the command for your system once, then close the terminal and open a new one.

echo 'export AITER_API_KEY="YOUR_API_KEY"' >> ~/.zshrc

echo 'export AITER_API_KEY="YOUR_API_KEY"' >> ~/.bashrc

setx AITER_API_KEY "YOUR_API_KEY"

In your project folder, start Codex; there is no sign-in. Type /status: it shows Model deepseek-4.1-unrestricted and Model provider aiter. Then ask something. Missing environment variable: `AITER_API_KEY` means that the variable is not set in this terminal; once it is, run codex app-server daemon restart, because the background server of Codex keeps the environment it started with.

codex

In Antigravity's editor, open the Extensions view, search for this ID and install Cline, published by saoudrizwan (not Cline (Nightly) or a look-alike).

saoudrizwan.claude-dev

Open Cline from its icon in the side bar. The first time, choose Bring my own API key and Continue; later, its gear icon opens Settings → API Configuration. Set API Provider to OpenAI Compatible and fill in these fields; the Model ID list shows the models your key may use.

https://sider.ai.id/v1

YOUR_API_KEY

deepseek-4.1-unrestricted

Under Model Configuration, set Max Output Tokens (8192 is a safe start; raise it if the model allows more) and Context Window Size, the model's context window shown on the Models tab of your dashboard. Clear Supports Images if the model does not read images.

Open your project's folder, start a new task in Cline (+) and ask for something that needs a tool, such as listing the project's files. Route POST /chat/completions not found (404) means the base URL lacks /v1; Invalid API key (401), that the key is wrong.

Install OpenCode. On Windows the npm command needs Node.js; scoop install opencode or choco install opencode work as well. OpenCode recommends WSL on Windows: inside WSL, use the macOS/Linux command.

curl -fsSL https://opencode.ai/install | bash

npm install -g opencode-ai

Save this as OpenCode's config for all your projects, ~/.config/opencode/opencode.json (Windows: %USERPROFILE%\.config\opencode\opencode.json; create the folder if it is missing), or as opencode.json in a project's folder for that project only. If the file exists already, add the model line and the aiter entry (under provider) to it instead. Under models, list each model you want to use, with its limits (see below).

{
  "$schema": "https://opencode.ai/config.json",
  "model": "aiter/deepseek-4.1-unrestricted",
  "provider": {
    "aiter": {
      "npm": "@ai-sdk/openai-compatible",
      "name": "Sider",
      "options": {
        "baseURL": "https://sider.ai.id/v1",
        "apiKey": "{env:AITER_API_KEY}"
      },
      "models": {
        "deepseek-4.1-unrestricted": {
          "limit": {
            "context": 128000,
            "output": 8192
          }
        }
      }
    }
  }
}

Put your API key in the environment variable AITER_API_KEY, in the terminal you start OpenCode from. It lasts until the terminal closes: to keep it, add the line to ~/.zshrc or ~/.bashrc (macOS, Linux), or run setx AITER_API_KEY "YOUR_API_KEY" once and open a new terminal (Windows).

export AITER_API_KEY="YOUR_API_KEY"

$env:AITER_API_KEY = "YOUR_API_KEY"

In the same terminal, check the config: opencode models aiter lists aiter/deepseek-4.1-unrestricted. Then start OpenCode in your project's folder; below the prompt it shows deepseek-4.1-unrestricted and Sider. Ask for something that needs a tool, such as listing the project's files. /models switches between the models of your config.

opencode models aiter
opencode

Install Hermes Agent with its official installer, which brings the Python it needs. On Windows, use PowerShell, or the Linux command inside WSL2. At the end, the installer opens the setup wizard.

curl -fsSL https://hermes-agent.nousresearch.com/install.sh | bash

iex (irm https://hermes-agent.nousresearch.com/install.ps1)

In the wizard, choose Full setup, then the provider Custom endpoint (enter URL manually). Enter the API base URL https://sider.ai.id/v1 and your API key (YOUR_API_KEY): Hermes checks them and lists the models your key may use. If the wizard did not open, or to change this later, run hermes model in a new terminal.

https://sider.ai.id/v1

Choose the API compatibility mode Chat Completions and the model deepseek-4.1-unrestricted, then press Enter at Context length (Hermes reads it from the service) and at Display name. For the rest of the wizard, keep the defaults and skip keys you do not have. Hermes saves the settings in ~/.hermes/config.yaml and the key in ~/.hermes/.env (on Windows without WSL, in %LOCALAPPDATA%\hermes).

deepseek-4.1-unrestricted

Open a new terminal and start Hermes. The welcome banner shows the model deepseek-4.1-unrestricted. Ask, for example, Which files are in this folder? Hermes runs a command to find out, then answers.

hermes

Install omp. The installer puts a ready-built omp in place, or installs it with Bun when Bun 1.4.4 or newer is there; brew install can1357/tap/omp works too. If the terminal then cannot find omp, follow the PATH line the installer prints and open a new terminal; omp --version shows the version.

curl -fsSL https://omp.sh/install | sh

irm https://omp.sh/install.ps1 | iex

Put your API key in the environment variable AITER_API_KEY of the terminal where you start omp: omp reads it from there, so the key stays out of its files. The variable lasts until you close the terminal. To keep it, add the line to ~/.zshrc (macOS) or ~/.bashrc (Linux); on Windows, run setx AITER_API_KEY "YOUR_API_KEY" once and open a new terminal.

export AITER_API_KEY="YOUR_API_KEY"

$env:AITER_API_KEY = "YOUR_API_KEY"

Add this service to ~/.omp/agent/models.yml (on Windows %USERPROFILE%\.omp\agent\models.yml): create the file with this content, or add the aiter entry under providers in the file you have. apiKey holds the variable's name, not the key. Add an entry to models for each model you use; the notes explain contextWindow and maxTokens.

providers:
  aiter:
    baseUrl: "https://sider.ai.id/v1"
    api: openai-completions
    apiKey: AITER_API_KEY
    compat:
      maxTokensField: max_tokens
    models:
      - id: "deepseek-4.1-unrestricted"
        contextWindow: 128000
        maxTokens: 8192

Check the connection: omp sends one request to deepseek-4.1-unrestricted through this service and prints the answer, such as OK. omp models aiter lists the models omp read from the file; a mistake in the file shows as models.yml validation failed with the field at fault.

omp -p --model aiter/deepseek-4.1-unrestricted "Reply with only OK"

Start omp in your project folder. The first start opens a setup wizard: on Set up your providers press Esc (the key is already in AITER_API_KEY), and on Choose your default model type aiter, select aiter/deepseek-4.1-unrestricted and press Enter. If omp was set up before, open /model and assign aiter/deepseek-4.1-unrestricted to Default.

omp

Install Pi. The installer also sets up Node.js if needed; with Node.js 22.19 or newer, npm install -g --ignore-scripts @earendil-works/pi-coding-agent works as well. pi --version then shows the version.

curl -fsSL https://pi.dev/install.sh | sh

powershell -c "irm https://pi.dev/install.ps1 | iex"

Put your API key in the environment variable AITER_API_KEY of the terminal where you start Pi: Pi reads it from there, so the key stays out of its files. The variable lasts until you close the terminal. To keep it, add the line to ~/.zshrc (macOS) or ~/.bashrc (Linux); on Windows, run setx AITER_API_KEY "YOUR_API_KEY" once and open a new terminal.

export AITER_API_KEY="YOUR_API_KEY"

$env:AITER_API_KEY = "YOUR_API_KEY"

Add this service to ~/.pi/agent/models.json (on Windows %USERPROFILE%\.pi\agent\models.json): create the file with this content, or add the aiter entry to providers in the file you have. Add an entry to models for each model you use; the notes explain contextWindow and maxTokens.

{
  "providers": {
    "aiter": {
      "name": "Sider",
      "baseUrl": "https://sider.ai.id/v1",
      "api": "openai-completions",
      "apiKey": "$AITER_API_KEY",
      "compat": {
        "supportsDeveloperRole": false,
        "maxTokensField": "max_tokens"
      },
      "models": [
        {
          "id": "deepseek-4.1-unrestricted",
          "contextWindow": 128000,
          "maxTokens": 8192
        }
      ]
    }
  }
}

Start Pi in your project folder with this model and send a short request, such as Reply with only OK: the answer comes from deepseek-4.1-unrestricted through this service. To start with this model every time, open /model, select it and press Ctrl+S. If Pi answers No API key found for aiter, AITER_API_KEY is not set in this terminal.

pi --model aiter/deepseek-4.1-unrestricted