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Models / OpenAI

o1

Retired

Snapshot o1-2024-12-17, including the o1 alias, was shut down on 2026-10-23 and OpenAI names gpt-5.6-sol as the replacement. Until 2026-10-24 the row was held at deprecated on OpenAI's own deprecations page, section '2026-04-22: Legacy GPT model snapshots', which stated the shutdown date and the recommended replacement as columns of a table; the date passing on 2026-10-23 was not treated as evidence on its own. Rates read the same day from developers.openai.com/api/docs/pricing (Standard tier), which priced deprecated models; on the 2026-10-24 read the pricing page's own data payload still carries these same rates, so they are kept as the last published ones. Standard-tier rates: input $15.00, cached input $7.50, output $60.00 per 1M. The cached-input discount here is only 50%, against the 90% that OpenAI applies across the gpt-5.x line, so a cache-heavy workload gains far less from staying on o1 than the headline rate suggests. Specs are from developers.openai.com/api/docs/models/o1: 200,000 context window, 100,000 max output tokens, knowledge cutoff Oct 01, 2023, text and image in, text out. released carries the date embedded in the snapshot id. o1-preview and o1-mini are separate rows on the same page with shutdown dates already past (2025-07-28 and 2025-10-27) and are not carried here. THE DELAY IS OURS, NOT A PROVIDER EVENT: the announcement, the date and the replacement are all OpenAI's, published 2026-04-22; this catalog simply never carried the row. It was added 2026-09-21, 32 days before the shutdown. CONFIRMED RETIRED 2026-10-24. Signal (first-party, past tense): the same section of developers.openai.com/api/docs/deprecations now states "Access to these models was shut down on October 23, 2026." and lists o1-2024-12-17 | o1 in its table with substitute gpt-5.6-sol - an executed shutdown, not a scheduled one. The substitute is unchanged.

o1 by OpenAI costs $15 per 1M input tokens and $60 per 1M output tokens ($26.25/1M blended), with a 200K (200.000-token) context window. It has been retired (shut down 23 Oct 2026); the recommended migration is GPT-5.6 Sol.

Last verified: 24 Oct 2026 · sourced from official provider documentation

Retired on 23 Oct 2026 · deprecated since 22 Apr 2026

Lifecycle warning

This model has been retired. Recommended migration: GPT-5.6 Sol.

Read the o1 migration guide → replacement & cheapest alternatives

Provider
OpenAI
Status
Retired
Input price
$15 / 1M tokens
Output price
$60 / 1M tokens
Cached input
$7.50 / 1M tokens
Blended price
$26.25 / 1M tokens
Context window
200.000 tokens (200K)
Max output
100.000 tokens
Modality
text, image
Open weights
No — API only
Knowledge cutoff
2023-10-01
Released
17 Dec 2024
API string
o1-2024-12-17

Source: OpenAI official documentation ↗

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FAQ

o1 — questions & answers

How much does o1 cost?

o1 is priced at $15 per 1M input tokens and $60 per 1M output tokens ($26.25/1M blended at a 3:1 input-to-output ratio), with cached input at $7.50 per 1M tokens.

What is the context window of o1?

o1 has a 200.000-token context window (200K), with up to 100.000 output tokens per request.

Is o1 still available?

o1 has been retired and is no longer available. Its scheduled shutdown date is 23 Oct 2026. The recommended migration is GPT-5.6 Sol.

Does o1 support image or vision input?

Yes — o1 accepts image input. Listed modalities: text, image.

Can I self-host o1?

No — o1 is proprietary. Its weights are not publicly released, so it is available only through OpenAI's API (or hosted partners), not for self-hosting.

What is the API model string for o1?

The API model identifier for o1 is "o1-2024-12-17" when calling OpenAI's API.

What is o1's knowledge cutoff?

o1's training knowledge cutoff is 1 Oct 2023.