Usage and billing units - Abstract

Every action chunk carries a usage object. The chunk is billed from that object, at the rates on abstract.inc/pricing.

{
  "prompt_tokens": 650,
  "prompt_tokens_details": { "cached_tokens": 0 },
  "completion_tokens": 30,
  "total_tokens": 680
}

Units

Unit on /pricing	Field	Meaning
Input, per 1M tokens	`prompt_tokens` minus `cached_tokens`	Model tokens the chunk encoded afresh, from its frames and its instruction.
Cached input, per 1M tokens	`prompt_tokens_details.cached_tokens`	Model tokens the chunk reused from earlier chunks of the same episode.
Output, per 1M actions	`completion_tokens`	Action rows the model computed.

completion_tokens counts the whole chunk the model computed. A smaller action_horizon returns fewer rows but does not lower completion_tokens.

Model	`completion_tokens` per chunk	`cached_tokens`
`abstract/dreamzero-astra:yam`	24	The part of the episode’s attention window reused from earlier chunks
`stealth/picasso:yam`	24	The part of the episode’s attention window reused from earlier chunks
`allenai/molmoact2:yam`	30	0
`microsoft/rho:yam`	25	0
`perceptron/isaac-0.5:yam`	30	0
`physical-intelligence/pi0.5:yam`	30	0

Picasso costs

0.40 per million input tokens,

0.005 per million cached input tokens, and $0.25 per million actions. These rates apply to both chat completions and WebSocket observations. Read usage from each answer. Do not compute it yourself. A JPEG count is not a token count.

How a chunk is metered

Before the model runs, the API reserves the chunk’s maximum cost against your monthly spend limit.
If that reservation would cross the limit, the API refuses the request with HTTP 429 spend_limit_exceeded. The model does not run.
When the answer arrives, the API settles the chunk from its usage, at the rates fixed when the request was submitted.
A chunk the model never delivered settles at zero. This covers errors, mid-stream failures, and closed sockets.

On the WebSocket, each observation is metered as one chunk. A request without images returns zero usage. Metered cost is enforced against your hard monthly spend limit.