AI Model Watch
Deprecations / Migrate

Migrate off o3

Deprecated

o3 is deprecated and shuts down on 11 Dec 2026. OpenAI's official replacement is GPT-5.5. The cheapest comparable model we track is Amazon Nova Lite (Amazon) at $0.105 per 1M tokens blended.

Last verified: 13 Aug 2026 · sourced from official provider documentation

StatusDeprecatedOpenAI
Shutdown date11 Dec 2026deprecated 11 Jun 2026
Official replacementGPT-5.5$11.25 /M blendedCheapest alternativeAmazon Nova Lite$0.105 /M blended
What changes

o3 → GPT-5.5

Moving to GPT-5.5 means 3.2× more expensive ($3.50 → $11.25 /1M blended) and a larger context window (200K → 1.1M).

Speco3GPT-5.5
StatusDeprecatedGA
Blended price /1M$3.50$11.25
Input / output /1M$2 / $8$5 / $30
Context window200K1.1M
Max output100.000128.000
Modalitytext, imagetext, image
Knowledge cutoff1 Jun 20241 Dec 2025

API string was o3-2025-04-16 → switch to gpt-5.5. See GPT-5.5's full spec sheet →

Cheapest alternatives

Budget-friendly replacements for o3

Generally-available models that match o3's capabilities (and at least half its 200K context), ranked by blended price. Every number is computed from official catalog prices.

ModelBlended /1MInput / outputContext
Amazon Nova Lite
Amazon
$0.105$0.06 / $0.24300K
Llama 4 Scout (17B-16E Instruct)
Meta
$0.15$0.1 / $0.310M
Ministral 3 8B
Mistral
$0.15$0.15 / $0.15256K
FAQ

Migrating off o3

What replaces o3?

OpenAI's recommended migration for o3 is GPT-5.5. The cheapest comparable model in our catalog is Amazon Nova Lite (Amazon) at $0.105/1M blended.

When is o3 shut down?

o3 is deprecated and scheduled to shut down on 11 Dec 2026 (deprecated 11 Jun 2026). Migrate before that date to avoid a 404.

What is the cheapest alternative to o3?

Amazon Nova Lite (Amazon) is the cheapest generally-available alternative we track that matches o3's capabilities, at $0.06 per 1M input and $0.24 per 1M output tokens ($0.105/1M blended).

Browse the full deprecation watch → or see o3's full spec sheet →