When do GPT-4.1 nano and GPT-4o (2024-05-13) stop working?

October 23, 2026. OpenAI shuts down GPT-4.1 nano and the original GPT-4o snapshot (2024-05-13) on October 23, 2026. OpenAI points to GPT-5.6 Luna ($0.20 input / $1.20 output per 1M tokens) or GPT-5.6 Sol ($4.00 input / $20.00 output per 1M tokens).

When do GPT-4o, GPT-4o mini, GPT-4.1 and GPT-4.1 mini stop working?

January 14, 2027. OpenAI removes four GPT-4 series models from its API on January 14, 2027. OpenAI points to GPT-6 Luna ($0.10 input / $0.50 output per 1M tokens) or GPT-5.6 Luna ($0.20 input / $1.20 output per 1M tokens).

What happens to a retired model on OverpayingForAI?

Once a vendor announces a retirement, the model is marked Deprecated and the calculator and recommender stop suggesting it. Its price history stays on the site. After the shutdown date, when OpenRouter drops it, it is also marked Unavailable.

AI model retirements and shutdown dates

When a vendor retires a model, every request to it fails after the shutdown date, so you have to switch. The switch is also a price change. Each retirement below shows the date, the vendor's own notice, and what the replacement costs per million tokens.

Reviewed October 20, 2026. Prices are live list prices from our catalogue; they compare cost, not quality.

Upcoming retirements

OpenAI·Shuts down October 23, 2026

GPT-4.1 nano and the first GPT-4o snapshot shut down

OpenAI shuts down GPT-4.1 nano and the original GPT-4o snapshot (2024-05-13) on October 23, 2026. Code that pins either ID needs to move before then.

Retiring models and replacement prices per 1M tokens
Retiring model	Price (in / out per 1M)	Switch to	Output cost change
GPT-4.1 nano openai/gpt-4.1-nano, openai/gpt-4.1-nano:batch	$0.10 / $0.40	GPT-5.6 Luna $0.20 / $1.20	+200%
GPT-4o (2024-05-13) openai/gpt-4o-2024-05-13	$5.00 / $15.00	GPT-5.6 Sol $4.00 / $20.00	+33%

OpenRouter's notice lists openai/gpt-4o-2024-05-13 with the January 14, 2027 group; OpenAI's own API removes it on October 23, 2026. Plan for the earlier date.

Price the switch in the calculator →Source: OpenAI API deprecations: 2026-04-22 Legacy GPT model snapshots

OpenAI·Shuts down January 14, 2027

GPT-4o, GPT-4o mini, GPT-4.1 and GPT-4.1 mini leave the API

OpenAI removes four GPT-4 series models from its API on January 14, 2027. OpenRouter stops serving them the same day, including requests that use your own OpenAI key (BYOK). Fine-tuned versions follow the same schedule. Requests to these model IDs fail after that date.

Retiring models and replacement prices per 1M tokens
Retiring model	Price (in / out per 1M)	Switch to	Output cost change
GPT-4o gpt-4o, openai/gpt-4o-2024-08-06, openai/gpt-4o-2024-11-20, openai/gpt-4o:batch	$2.50 / $10.00	GPT-6 Luna $0.10 / $0.50 GPT-5.6 Luna $0.20 / $1.20	-95% -88%
GPT-4o mini gpt-4o-mini, openai/gpt-4o-mini-2024-07-18, openai/gpt-4o-mini:batch	$0.15 / $0.60	GPT-6 Luna $0.10 / $0.50 GPT-5.6 Luna $0.20 / $1.20	-17% +100%
GPT-4.1 openai/gpt-4.1, openai/gpt-4.1:batch	$2.00 / $8.00	GPT-6 Luna $0.10 / $0.50 GPT-5.6 Luna $0.20 / $1.20	-94% -85%
GPT-4.1 mini openai/gpt-4.1-mini, openai/gpt-4.1-mini:batch	$0.40 / $1.60	GPT-6 Luna $0.10 / $0.50 GPT-5.6 Luna $0.20 / $1.20	-69% -25%

OpenAI names GPT-6 Luna as the replacement; OpenRouter's notice also offers GPT-5.6 Luna. The :batch rows are OpenRouter's batch pricing for the same models and go with them. Prices compared here are list prices only, not quality.

Price the switch in the calculator →GPT-4o vs GPT-4o mini cost →When to upgrade from GPT-4o mini →Source: OpenAI API deprecations: 2026-10-14 GPT-4 series model deprecations

Recently retired

OpenAI·Shut down July 23, 2026

GPT-4o Search Preview models shut down

OpenAI shut down GPT-4o Search Preview and GPT-4o mini Search Preview on July 23, 2026. Both have left OpenRouter.

Retiring models and replacement prices per 1M tokens
Retiring model	Price (in / out per 1M)	Switch to	Output cost change
GPT-4o Search Preview openai/gpt-4o-search-preview, openai/gpt-4o-mini-search-preview	$2.50 / $10.00	GPT-5.6 Terra $2.00 / $12.00	+20%

Source: OpenAI API deprecations: 2026-04-22 Legacy GPT model snapshots (July 2026 shutdown)

Questions

When do GPT-4.1 nano and GPT-4o (2024-05-13) stop working?: October 23, 2026. OpenAI shuts down GPT-4.1 nano and the original GPT-4o snapshot (2024-05-13) on October 23, 2026. OpenAI points to GPT-5.6 Luna ($0.20 input / $1.20 output per 1M tokens) or GPT-5.6 Sol ($4.00 input / $20.00 output per 1M tokens).
When do GPT-4o, GPT-4o mini, GPT-4.1 and GPT-4.1 mini stop working?: January 14, 2027. OpenAI removes four GPT-4 series models from its API on January 14, 2027. OpenAI points to GPT-6 Luna ($0.10 input / $0.50 output per 1M tokens) or GPT-5.6 Luna ($0.20 input / $1.20 output per 1M tokens).
What happens to a retired model on OverpayingForAI?: Once a vendor announces a retirement, the model is marked Deprecated and the calculator and recommender stop suggesting it. Its price history stays on the site. After the shutdown date, when OpenRouter drops it, it is also marked Unavailable.

Retirement dates come from each vendor's own deprecation notice, linked on every entry. For changes that already happened, see the pricing changelog; for new models, see latest AI releases. Compare any model in the AI Cost Calculator or the AI Pricing Tracker.