OpenAI gives developers six months' notice to retire gpt-5.1 and two other API models
gpt-5.1, gpt-5.3-codex and gpt-5.4-nano will be removed from the API on April 1, 2027.
OpenAI has set a shutdown date of April 1, 2027 for three API models, gpt-5.1, gpt-5.3-codex and gpt-5.4-nano, in a deprecation notice dated Oct. 1, MIXED Reality News reported on Saturday.
OpenAI points both gpt-5.1 and gpt-5.3-codex to gpt-6-sol as the recommended replacement, and gpt-5.4-nano to gpt-6-luna. The six-month notice matches the floor OpenAI sets for generally available models, the publication noted, after the company gave gpt-5.4-cyber about 20 days' notice in September.
The changes affect API model IDs used from developers' own code, services and plugins, not ChatGPT's model picker. OpenAI's v1/prompts API and reusable prompt objects, Agent Builder and the Evals platform are scheduled to shut down on Nov. 30, 2026, according to the report.
Teams building on these models now have a fixed migration deadline to plan around.
From ARQS Sponsored
On the practical side, West Coast companies can turn to Northline course catalogue, ARQS security, Live Intelligence and AI receptionist. In the ARQS Store, Small Business Launch Systems, AI-J113 — Prompt Architecture for Business, AI-J114 — Practical AI Workflow Foundations are among the newest tools available.
- ARQS Connect
- AI automation agency
- ReplyDesk
- Business plans
- Competitive Intelligence
- Corporate Intelligence
- Market opportunity report
- Market expansion intelligence
- Customer acquisition intelligence
- Operational Intelligence
- AI Academy Year 1 — Foundations AI for Marketing
- AI Academy Year 1 — Foundations AI for Sales
- AI Academy Year 1 — Foundations Customer Service AI
From our partners
Partner content
Most read
- Court halts Vancouver Aquatic Centre demolition until after civic election
- TSX gains 319 points as energy and telecom stocks lead
- Poilievre takes his tariff-free auto pact pitch to Detroit
- 'I Play Rocky' and 'Ceremony' take VIFF audience awards
- BC Conservatives take five-point lead as leaders head into only TV debate
