/changes.xml is an Atom feed of recent price changes across the whole catalogue — increases, decreases, additions and removals of models. It's public, read-only and needs no sign-up or API key: It lives outside the locale prefix (unlike the rest of the catalogue): a feed URL that moves is one nobody stays subscribed to. Content-Type: application/atom+xml, with Cache-Control: public, max-age=3600, s-maxage=3600.

/changes.xml accepts these parameters, the same as its JSON equivalent: | Parameter | Content | | --- | --- | | provider | Only this provider's changes (its slug: openai, anthropic…) | | model | Only this model's changes (its slug, without the provider) | | q | Free text: searches by slug and by display name, of the model and of its provider (2026-09-17) | | kind | One or several event kinds, comma-separated | By default the feed only shows market moves — increases, decreases, removals and unit changes — never catalogue additions (priceadded, coverageadded, reference_changed): those are "New in the catalogue" on /changes, not a price change. Asking for them is a matter of naming them in kind. An unknown kind is ignored rather than breaking the feed.

Price changes feed — AI API Pricing

Q: What each entry carries

Every is one price change: | Atom field | Content | | --- | --- | | title | {model} — {price label} {up\|down\|added\|removed}: {old amount} → {new amount} (±n%) | | id | Stable identifier for the change | | link | The model's page in the catalogue | | updated | ISO date and time of the change | | summary | Same text as title | For example, an output price increase:

Q: Window and cap

The feed covers the last 90 days and publishes at most 100 entries — newest first. For a different range, or to page past the cap, use the JSON equivalent below.

Q: How to subscribe

Paste https://aiapipricing.slxd.app/changes.xml into any feed reader (Feedly, NetNewsWire, your browser's built-in reader…). The catalogue also announces it via autodiscovery — a in the head of every public page — so many readers find it on their own once you paste the home page's URL.

Q: The same data in JSON

If you'd rather have JSON than Atom, read GET /api/v1/changes, with the same filters (provider, model, q, kind) plus days and limit to set the window and cap by hand — the same data, without the feed's envelope.

Overview

/changes.xml is an Atom feed of recent price changes across the whole catalogue — increases, decreases, additions and removals of models. It's public, read-only and needs no sign-up or API key:

curl https://aiapipricing.slxd.app/changes.xml

It lives outside the locale prefix (unlike the rest of the catalogue): a feed URL that moves is one nobody stays subscribed to. Content-Type: application/atom+xml, with Cache-Control: public, max-age=3600, s-maxage=3600.

What each entry carries

Every <entry> is one price change:

Atom field	Content
`title`	`{model} — {price label} {up\|down\|added\|removed}: {old amount} → {new amount} (±n%)`
`id`	Stable identifier for the change
`link`	The model's page in the catalogue
`updated`	ISO date and time of the change
`summary`	Same text as `title`

For example, an output price increase:

<entry>
  <title>anthropic/claude-opus-5 — Output up: 15 → 18 (+20%)</title>
  <id>https://aiapipricing.slxd.app/models/anthropic/claude-opus-5#Output-2026-08-01T00:00:00.000Z</id>
  <link href="https://aiapipricing.slxd.app/models/anthropic/claude-opus-5"/>
  <updated>2026-08-01T00:00:00.000Z</updated>
  <summary>anthropic/claude-opus-5 — Output up: 15 → 18 (+20%)</summary>
</entry>

Window and cap

The feed covers the last 90 days and publishes at most 100 entries — newest first. For a different range, or to page past the cap, use the JSON equivalent below.

Filters

/changes.xml accepts these parameters, the same as its JSON equivalent:

Parameter	Content
`provider`	Only this provider's changes (its slug: `openai`, `anthropic`…)
`model`	Only this model's changes (its slug, without the provider)
`q`	Free text: searches by slug and by display name, of the model and of its provider (2026-09-17)
`kind`	One or several event kinds, comma-separated

curl "https://aiapipricing.slxd.app/changes.xml?provider=openai&kind=price_decrease"

By default the feed only shows market moves — increases, decreases, removals and unit changes — never catalogue additions (price_added, coverage_added, reference_changed): those are "New in the catalogue" on /changes, not a price change. Asking for them is a matter of naming them in kind. An unknown kind is ignored rather than breaking the feed.

Paste https://aiapipricing.slxd.app/changes.xml into any feed reader (Feedly, NetNewsWire, your browser's built-in reader…). The catalogue also announces it via autodiscovery — a <link rel="alternate" type="application/atom+xml"> in the head of every public page — so many readers find it on their own once you paste the home page's URL.

The same data in JSON

If you'd rather have JSON than Atom, read GET /api/v1/changes, with the same filters (provider, model, q, kind) plus days and limit to set the window and cap by hand — the same data, without the feed's envelope.

Overview

What each entry carries

Window and cap

Filters

How to subscribe

The same data in JSON

See also