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Purchased credit

Purchased credit is in US dollars and never expires. Buy it on the billing page in packs of $5, $20 and $50, or any amount from $2 to $1,000. $5 adds $5 of credit. A request on credit is charged at the model’s list price plus 20%, for its input, cached input and output; list prices are on the plan pages and below. In PAYG mode, cache writes count at the model’s cache-write rate (Prompt caching). Purchased credit is separate from a plan’s monthly usage. It is spent in two cases: in PAYG mode, and as extra usage past a plan’s limits.

PAYG mode

  • Turn on PAYG mode for a key on the keys page, or send the x-sideren-payment-mode: payg header with a request. The setup helper’s npx sideren setup --payment-mode payg stamps that header into the agents it configures.
  • In PAYG mode every model is available, whatever your plan: all 143, including the ones below that no plan includes.
  • An empty balance returns 402 paid_credit_required; only a top-up clears it.

Extra usage

Extra usage keeps a plan going past its limits. Turn it on on the billing page: past your monthly usage or a 5-hour or weekly limit, requests carry on using purchased credit, with your plan’s models, while you have enough. It doesn’t cover the PAYG-only models below. See Usage limits.

Models only in PAYG mode

These 16 models are on no plan. They run only in PAYG mode, never use a plan’s usage, and extra usage doesn’t cover them. Requested without PAYG mode, they return 400 payg_required. Prices are list prices in US dollars per 1M tokens. A dash under Cached input means the model has no cached-input discount: cached input costs the input price.

Anthropic

opus-4.5 retires on Nov 24, 2026: move to opus-4.6.

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