AI Model Watch
Models / OpenAI

o3

Deprecated

o-series reasoning model. Snapshot o3-2025-04-16 shuts down 2026-12-11, replaced by gpt-5.5. Pricing still on spec page: $2 in / $0.50 cached / $8 out per 1M.

o3 by OpenAI costs $2 per 1M input tokens and $8 per 1M output tokens ($3.50/1M blended), with a 200K (200.000-token) context window. It is deprecated, shutting down 11 Dec 2026; the recommended replacement is GPT-5.5.

Last verified: 26 Sep 2026 · sourced from official provider documentation

Retires on 11 Dec 2026 · deprecated since 11 Jun 2026

Lifecycle warning

This model is deprecated. Recommended migration: GPT-5.5.

Read the o3 migration guide → replacement & cheapest alternatives

Provider
OpenAI
Status
Deprecated
Input price
$2 / 1M tokens
Output price
$8 / 1M tokens
Cached input
$0.5 / 1M tokens
Blended price
$3.50 / 1M tokens
Context window
200.000 tokens (200K)
Max output
100.000 tokens
Modality
text, image
Open weights
No — API only
Knowledge cutoff
2024-06-01
Released
16 Apr 2025
API string
o3-2025-04-16

Source: OpenAI official documentation ↗

See also

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FAQ

o3 — questions & answers

How much does o3 cost?

o3 is priced at $2 per 1M input tokens and $8 per 1M output tokens ($3.50/1M blended at a 3:1 input-to-output ratio), with cached input at $0.5 per 1M tokens.

What is the context window of o3?

o3 has a 200.000-token context window (200K), with up to 100.000 output tokens per request.

Is o3 being deprecated or retired?

o3 is deprecated. Its scheduled shutdown date is 11 Dec 2026. The recommended migration is GPT-5.5.

Does o3 support image or vision input?

Yes — o3 accepts image input. Listed modalities: text, image.

Can I self-host o3?

No — o3 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 o3?

The API model identifier for o3 is "o3-2025-04-16" when calling OpenAI's API.

What is o3's knowledge cutoff?

o3's training knowledge cutoff is 1 Jun 2024.