Statement on withdrawn models
What it means when a Falcon model is withdrawn: what happens to its route, its page and its weights, and the register of models withdrawn so far.
Four to six sentences from Cognitio, written on request. Generated text: the page is the reference.
On this page
Falcon is in private preview, and the line-up changes as models prove themselves or do not. A model that is no longer worth serving is withdrawn: taken out of service, removed from the model list and recorded here. This page states what a withdrawal means for anyone who built against the model, and keeps the register of every withdrawal so far. It is the page to check when a route starts answering 410.
What withdrawal means #
- **The route answers
410 route_withdrawn.** The address stays reserved and never changes meaning. The body carriessuccessor: the route that takes over the job, ornullwhen nothing does. A call to a withdrawn route is not metered and never reaches a model. - The page redirects. The model’s address on this site redirects, permanently, to its successor or to the nearest sibling in its series, so saved links keep landing somewhere useful. The page itself, its metrics and its examples are removed rather than kept as an archive; the changelog keeps the record of what the model was and why it went.
- The weights stop being distributed. A withdrawn model’s weights are no longer offered for download or hosted on a dedicated tier. Weights already downloaded under their licence stay usable under that licence.
- Its quota bucket carries on. A withdrawn route leaves its bucket; calls already counted stay counted, and no bucket is removed while another route still uses it.
- Its family and role may go with it. When a withdrawn model was the only member of a family, the family leaves the vocabulary; a role tag with no remaining member stays defined but unused.
Notice #
The status vocabulary provides for a Deprecated step, with a notice period recorded on the changelog, before a route is withdrawn. During the private preview that step can be short or skipped: a model may be deprecated and withdrawn on the same day, and a model may be discontinued with immediate effect. Every such decision is dated in the register below and in the changelog on the day it takes effect. An integration that must not break should treat 410 route_withdrawn as a first-class answer, read successor, and watch the changelog.
Register #
| Model | Series | Withdrawn | Route | Successor | Reason |
|---|---|---|---|---|---|
| ERM 1.0.0 | Response | 2026-09-20 | /v1/reserve → 410 | Cognitio on /v1/chat | A generated reply proved more useful than a fixed line in every deployment, and a host that needs a fallback for an unavailable responder can hold a fixed line of its own. Deprecated and withdrawn the same day. |
| Express2Text 1.0.0 | Express | 2026-09-21 | /v1/transcribe → 410 | None | Withdrawn for poor model quality (12.1 % word error rate on read speech, 25.5 % on harder speech), the high upkeep a speech recogniser would need to keep pace, a saturated market for the task, and because in its private preview it did not meet the quality standard a Falcon model is held to. Discontinued with immediate effect; the Transcription family left the Express series with it. |
| Lumen (pilot, chat site only) | — | 2026-09-21 | /v1/complete → 410; model: "lumen" no longer accepted on /v1/chat | Cognitio on /v1/chat | A 114M-parameter language model trained from scratch and offered on the chat site as a pilot; withdrawn after a cost-benefit review found it could not reasonably be maintained or made competitive. It never had a page on this site. A copy of its weights is kept in cold storage. |
The Waymark Indoor page of 2026-09-19 is not a withdrawal: its skill was folded into Waymark 1.1.0 on 2026-09-20, the page redirects to Waymark, and the request value "model": "waymark-indoor" still answers as an alias.
What stays #
A withdrawal never changes another model. The envelope, the error codes, the quota buckets and the routes of every remaining model are exactly as documented on API conventions, and the Families page describes the line-up as it stands today. Questions about a withdrawn model, including requests for its weights under the original licence, go to the contact on the Access page.