Is o4-mini-deep-research deprecated?

Q: Is o4-mini-deep-research deprecated?

Yes — deprecated. Retired 2026-07-23 — 69 days ago. Requests to this identifier are expected to fail. The provider names gpt-5.6-sol as the replacement.

DEPRECATED

Retired 2026-07-23 — 69 days ago. Requests to this identifier are expected to fail. The provider names gpt-5.6-sol as the replacement.

state=dead sunset=2026-07-23 days_remaining=-69 severity=critical sources=docs,litellm evidence_tier=documentation confirmed_by_endpoint=false documented_by_provider=docs replacement=gpt-5.6-sol corroborated=yes divergent_fields=none checked=2026-09-30 15:40Z

openai/o4-mini-deep-research

Vendor: openai. Tracked by 2 of 5 sources.

What each source reports

**endpoint** = the provider's own machine-readable API, the strongest evidence. **provider docs** = the provider's own documentation, read by a model — first-party content, inferred reading. Unlabelled rows are third-party catalogs. Where sources disagree both values are shown rather than silently reconciled.
Source	ID	Context	Max out	In $/Mtok	Out $/Mtok	Sunset
docs	o4-mini-deep-research	—	—	—	—	2026-07-23
litellm	o4-mini-deep-research	200,000	100,000	$2	$8	2026-07-23

Change history

Severity	Change	What	Detected
info	deprecated	o4-mini-deep-research: deprecation announced for 2026-07-23 (date already passed)	2026-09-28
low	added	new model o4-mini-deep-research (200,000 ctx)	2026-09-24
medium	removed	[one catalog only — docs still list it] o4-mini-deep-research is no longer listed by this source — calls to it are expected to fail	2026-09-23
low	modified	o4-mini-deep-research: capabilities gained reasoning	2026-09-09
critical	deprecated	o4-mini-deep-research: deprecation announced for 2026-07-23 (date already passed)	2026-08-12
critical	deprecated	o4-mini-deep-research: retires 2026-07-23 (9 days ago)	2026-08-01
low	added	new model o4-mini-deep-research	2026-08-01