Claude Subscription

Use your Claude Pro/Max subscription instead of a pay-as-you-go API key. A subscription OAuth token authenticates against the same native Anthropic API as an API key, but draws on your subscription's rolling quota (the 5-hour / 7-day window) rather than API billing.

#![allow(unused)]
fn main() {
use minillmlib::{ChatNode, GeneratorInfo, TokenPrice};

async fn run() -> minillmlib::Result<()> {
// Anthropic returns token counts but no dollar cost, so set a price for a
// resolved cost ESTIMATE (otherwise tracking reports `Unpriced`).
let generator = GeneratorInfo::claude_subscription("claude-haiku-4-5")
    .with_token_price(TokenPrice::new(1.0, 5.0)); // $/Mtok in, $/Mtok out

let root = ChatNode::root("You are helpful.");
let response = root.chat("Hello!", &generator).await?;
let _ = response;
Ok(()) }
}

How the token is resolved

claude_subscription resolves the bearer token in this order:

1. the ANTHROPIC_AUTH_TOKEN env var, if set (explicit override; you keep it fresh, e.g. from claude setup-token);
2. otherwise the live Claude Code credential at ~/.claude/.credentials.json (claudeAiOauth.accessToken), which Claude Code keeps refreshed, so if you're logged into Claude Code with your subscription, it just works.

If neither source yields a token, the request fails loudly as unauthenticated rather than silently using the wrong account.

Subscription vs Console

A subscription token (from Claude Code) bills your Pro/Max plan. A Console/API OAuth token bills your API account, not the subscription. For Console use an API key via GeneratorInfo::anthropic(model), and this preset only for the actual Pro/Max subscription token.

Cost is always an ESTIMATE here: Anthropic returns only token counts, so the TokenPrice you set (reflecting the model's published price) produces a Resolved USD estimate; without it, tracking reports Unpriced.