model · model/anthropic-claude-opus-4-8-fast
Anthropic: Claude Opus 4.8 (Fast)
The anthropic/claude-opus-4.8-fast row disappeared from the OpenRouter
catalog in the 2026-09-02 snapshot, a day after it was last listed, active
and without an expiry date. The bound facts above still render their
last-known values as of 2026-09-01. The same snapshot also dropped the fast
rows for Claude Opus 5 and Claude Opus 4.7.
This was a consolidation, not a retirement. Anthropic's
fast-mode documentation
still lists Claude Opus 4.8 as a fast-mode model — a research preview, up
to 2.5 times the output tokens per second at twice the base price — and
OpenRouter sells the option on the standard row rather than as a separate
slug. Its own notice on the old slug's page dates the change to September
1, 2026: the dedicated fast model is deprecated, and fast mode is now
served by the fast service tier endpoint on Claude Opus 4.8 — request it
with service_tier: "fast" or speed: "fast". "Requests to this model
keep working and are served by the same fast tier capacity, so no action is
required, but new integrations should target the regular model"
(model page;
service-tier docs).
One caveat for anyone running the same check: the router's endpoints API
returns the model record with an empty endpoints array for this slug
(HTTP 200, measured 2026-09-02), while the standard row still lists
endpoints. Nothing published resolves whether that means the slug is aliased
internally or genuinely unroutable; OpenRouter's notice, quoted above, is
the authority that requests still route. So the old slug still answers and
still serves; what changed is the name to build against. The row left the
router's model list between the 2026-09-01 and 2026-09-02 snapshots, which
is why the facts above freeze at 2026-09-01.
For new work, call anthropic/claude-opus-4.8 with service_tier: "fast"
or speed: "fast" — the fast endpoint on that row prices at $10 / $50 per
million tokens, the same rates this row's last-known facts record, twice the
standard $5 / $25. On Anthropic's own API, send speed: "fast" with the
fast-mode-2026-02-01 beta header, per its
fast-mode documentation.
What changed is the tier flag, not the capability.
Facts
- price input
- not publishedlast known value, as of an unrecorded date — the source no longer lists this rowopenrouter-models, last checked 2026-09-14
- price output
- not publishedlast known value, as of an unrecorded date — the source no longer lists this rowopenrouter-models, last checked 2026-09-14
- context window
- not publishedlast known value, as of an unrecorded date — the source no longer lists this rowopenrouter-models, last checked 2026-09-14
- status
- not publishedlast known value, as of an unrecorded date — the source no longer lists this rowopenrouter-models, last checked 2026-09-14