ChangeProof · public deterministic source

Inference pricing Source Lab

A controlled, public catalog for proving the difference between a real pricing change, extraction drift, and a plausible semantic mismatch.

state: layout-drift

Explicit state controls

State is selected only by the URL query. There is no clock, random seed, session state, or mutable server store.

Primary layout sentinel
drifted-comparison
Representation
both
Witness
available
primary representation

Rate card comparison view

This is the extraction-facing representation. Identity and semantic context are explicit; layout is a deliberately weak sentinel.

Layout/extraction drift is active: the values are unchanged, but the primary markup has been reflowed into a comparison row.

reflowed markupchangeproof/atlas-20b

Atlas 20B

Output / 1M tokens$0.3000Input / 1M tokens$0.0750Cached input / 1M$0.0370
Currency
USD
Billing unit
per_1m_tokens
Context window
131072
Max output
65536
reflowed markupchangeproof/atlas-120b

Atlas 120B

Output / 1M tokens$0.6000Input / 1M tokens$0.1500Cached input / 1M$0.0750
Currency
USD
Billing unit
per_1m_tokens
Context window
131072
Max output
65536
corroborating representation

Published pricing notes

A stable docs-style representation of the same published fact. It is optional evidence, not a prerequisite for normal single-source monitoring.

Atlas 20B documentation

Model identifier
changeproof/atlas-20b
Input price in USD per 1M tokens
$0.0750
Cached input price in USD per 1M tokens
$0.0370
Output price in USD per 1M tokens
$0.3000

Atlas 120B documentation

Model identifier
changeproof/atlas-120b
Input price in USD per 1M tokens
$0.1500
Cached input price in USD per 1M tokens
$0.0750
Output price in USD per 1M tokens
$0.6000

JSON contract: /api/source-lab. The API is a deterministic inspection surface; the HTML representations above are the extraction-facing Source Lab.