o1 API Pricing

Legacy OpenAI reasoning model retained for pricing research and migration planning.

200K tokens contextVerified Oct 3, 2026Official vendor source

Pricing at a glance

Legacy model

o1 is retained for historical cost research. For new workloads, review o3-pro pricing and availability.

API cost calculator

What would o1 cost your company?

Enter monthly usage in millions of tokens. Results update instantly.

Input tokens (millions)

Cached input (millions)

Output tokens (millions)

Rate

Standard

Estimated monthly cost

$270

Estimated annual cost

$3,240

Free forever · No credit card · Usage and selected rate are saved automatically.

Published USD rates per one million tokens.

Scenario	Input	Cached input	Output
Standard	$15	$7.5	$60

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Image input

Context window: 200K tokens. Availability and rate limits can depend on account tier and region.