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Migrating from o1-preview to o3

What changes when you move from o1-preview to o3: context window 128,000 → 200,000 tokens.

Status
Retired
Shutdown
Jul 28, 2025
Time left
—
To
o3
Status
Active
Shutdown
none announced
Time left
—

Prices

USD per 1M tokens, standard tier
Typeo1-previewo3Change
InputNot published$2.00first seen October 1, 2026 · source—
Cached inputNot published$0.50first seen October 1, 2026 · source—
OutputNot published$8.00first seen October 1, 2026 · source—

Other tiers, prompt-size bands and modalities are on each model's page.

Limits

Tokens
Limito1-previewo3Change
Context window128,000 tokensin place when tracking began (October 7, 2026) · source200,000 tokensin place when tracking began (October 7, 2026) · source+56.3%
Max output tokens32,768 tokensin place when tracking began (October 7, 2026) · source100,000 tokensin place when tracking began (October 7, 2026) · source+205.2%

Features and parameters

Compare models
  • Batch API: not supported on o1-preview, supported on o3.o1-preview: in place when tracking began (October 7, 2026) · source · o3: in place when tracking began (October 7, 2026) · source

Same on both

  • Structured outputs: supported on both.o1-preview: in place when tracking began (October 7, 2026) · source · o3: in place when tracking began (October 7, 2026) · source
  • Function calling: supported on both.o1-preview: in place when tracking began (October 7, 2026) · source · o3: in place when tracking began (October 7, 2026) · source
  • Reasoning / thinking: supported on both.o1-preview: in place when tracking began (October 7, 2026) · source · o3: in place when tracking began (October 7, 2026) · source
  • Fine-tuning: not supported on both.o1-preview: in place when tracking began (October 7, 2026) · source · o3: in place when tracking began (October 7, 2026) · source

Not published for o1-preview: Prompt caching, Image input, PDF input, Built-in web search, temperature parameter, top_p parameter, logprobs.

Not published for o3: PDF input, Built-in web search, temperature parameter, top_p parameter, logprobs.

Aliases

All aliases

No aliases point at either model.

Checklist

  1. Change the model string from o1-preview to o3.

Compared from AIWire's published data when this page loaded. Each fact links to the page it came from. Model pages: o1-preview, o3.