dario

Your Claude and ChatGPT subscriptions each work in exactly one place.dario makes them work everywhere — at subscription pricing, not per-token API bills.

npm i -g @askalf/dario · 0 runtime deps · SLSA-attested every release · nothing phones home · ~36k lines you can read in a weekend · independent, unofficial, third-party (DISCLAIMER.md)

Start · Your tools · Routing · Two plans · Pool · Drift · Trust · Risk · Commands · FAQ · Coming back after a while?

You're already paying $20, $100 or $200 a month for Claude,[^plans] or for a ChatGPT plan. Then Cursor wants an API key. Aider wants an API key. Cline, Continue, Zed, your own scripts — every one of them bills you again, per token, while the plan you bought sits idle in the one app it shipped with.

dario is one local endpoint that routes all of them through the plans you already pay for. Point any Anthropic- or OpenAI-compatible tool at http://localhost:3456 and you're done. No per-tool config, no second bill, and when one plan hits its limit the other one takes the request.

Start in 60 seconds

# 1. Install
npm install -g @askalf/dario

# 2. Log in to your Claude subscription (Pro, Max 5x, or Max 20x)
dario login                 # or `dario login --manual` for SSH / headless

# 3. Start the local proxy
dario proxy                 # separate terminal or background

# 4. Point any Anthropic-compatible tool at it
export ANTHROPIC_BASE_URL=http://localhost:3456
export ANTHROPIC_API_KEY=dario

That's the whole setup. Every tool that honors those env vars now runs on your subscription. OpenAI-shaped tools use OPENAI_BASE_URL=http://localhost:3456/v1 instead, same key.

Works with: Claude Code, Cursor, Aider, Cline, Roo Code, Kilo Code, Continue.dev, Zed, OpenHands, OpenClaw, Hermes, Codex CLI, the Claude Agent SDK, the Anthropic and OpenAI SDKs, curl, your own scripts. Per-tool snippets are one section down.

Prefer Docker? ghcr.io/askalf/dario:latest — multi-arch (amd64 + arm64), published from the same workflow as every npm release (guide). Something off? dario doctor prints one paste-ready health report.

Point your tools at it

Two base URLs, one key. Anthropic-shaped clients talk to http://localhost:3456; OpenAI-shaped clients — chat/completions and, since 6.3, the Responses API — talk to http://localhost:3456/v1. The key is dario (any value works until you set DARIO_API_KEY, which then has to match).

# ~/.codex/config.toml
model = "claude-opus-5"
model_provider = "dario"

[model_providers.dario]
name = "dario"
base_url = "http://127.0.0.1:3456/v1"
env_key = "DARIO_API_KEY"
wire_api = "responses"

Codex CLI 0.154 dropped the chat wire for custom providers, so dario speaks the Responses API: the request is translated once at the front door and served like any Claude request — pool, failover, mid-stream continuation, the 17 KB Codex system prompt cached on the Claude side. The full agent loop runs: Claude calls exec_command, Codex executes it, the result goes back, Claude answers from it. Add a ChatGPT account too and -m gpt-5.6-sol on the same block goes to that plan through the same proxy. Walkthrough and what is dropped.

export ANTHROPIC_BASE_URL=http://localhost:3456
export ANTHROPIC_API_KEY=dario
claude

A genuine Claude Code request already is the Claude Code shape, so dario forwards it byte-for-byte — system prompt, tools, thinking, key order untouched — swapping in only the pool's credential, its billing tag and cache breakpoints. That covers the main loop, its Task/Agent sub-agents and the permission classifier. What you gain is the pool: several seats behind the one URL, with headroom routing and 429 failover. Background: #678.

Cursor's BYOK is backend-mediated: the app sends your base URL up to Cursor's servers and they make the call, behind an SSRF guard that rejects localhost by design (confirmed by Cursor staff, threads linked in the long-form guide). So:

dario proxy                                     # terminal 1
cloudflared tunnel --url http://localhost:3456   # terminal 2 → https://<random>.trycloudflare.com

In Cursor → Settings → Models: enable Override OpenAI Base URL with https://<random>.trycloudflare.com/v1, key dario, and add models as anthropic:opus / anthropic:sonnet / anthropic:haiku. The anthropic: prefix routes to the Claude backend without the claude- substring that makes Cursor switch to a tool format the OpenAI path can't parse, and it dodges Cursor's built-in-name collision. Use Agent mode (Cmd/Ctrl+I); Chat sends no tools. Treat the tunnel URL as a credential. Full walkthrough with every gotcha: agent-compat.md#cursor.

Provider Anthropic · API key dario · Anthropic Base URL http://localhost:3456 · model claude-sonnet-5 / claude-opus-5 / claude-haiku-4-5.

These clients speak an XML tool protocol. dario detects them from their system-prompt identity markers and flips into preserve-tools mode on its own, so their schemas pass through and their parsers keep working. --no-auto-detect if you'd rather choose. [Details](./docs/integrations/agent-compat.md#cl