How much does o1 cost per month?

For a chatbot handling 10,000 requests a day with 1,000 input and 500 output tokens each, o1 costs about $13,500 per month at OpenAI's list prices ($15.00 per 1M input tokens, $60.00 per 1M output tokens).

Does o1 support prompt caching?

Yes. Cached input costs $7.50 per 1M tokens, compared with $15.00 for regular input.

How long is o1's context window?

o1 accepts up to 200,000 tokens (200K) of context and returns up to 100,000 tokens per response.

o1 API Pricing

OpenAI has deprecated this model. The price is kept here for reference; check the provider's documentation before building on it.

OpenAI · released Dec 5, 2024 · 200K context · API model ID o1

o1 by OpenAI API pricing: $15.00 per 1M input tokens and $60.00 per 1M output tokens (provider list price via models.dev, Oct 10, 2026).

Prices

o1 prices, USD per 1M tokens
Price	USD per 1M tokens
Input	$15.00
Output	$60.00
Cache read	$7.50
Cache write	Not published

OpenAI's list price for its own API, as compiled by models.dev and checked Oct 10, 2026, 09:00 UTC. Prices on cloud platforms and resellers can differ. Provider documentation

Estimated monthly cost

$13,500

per month

per day: $450.00
per request: $0.045

Cost = input tokens × input price + output tokens × output price, 30 days a month. Cached input uses the cache read price. Cache write fees are not included.

Compare this workload across models

Monthly cost by workload

Workload	Per month
Chatbot1,000 in / 500 out tokens, 10,000 requests a day	$13,500/mo
RAG8,000 in / 500 out tokens, 5,000 requests a day	$22,500/mo
Coding agent50,000 in / 2,000 out tokens, 1,000 requests a day, 80% cached input	$17,100/mo

Context and capabilities

Context: 200,000 tokens
Max output: 100,000 tokens
Input: text, image, pdf
Output: text
Knowledge cutoff: September 2023
Open weights: No
Tool calling: Yes
Reasoning: Yes
Structured outputs: Yes

Capabilities and limits as listed by models.dev.

Similarly priced models

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Kimi K3 · $3.00 in / $15.00 out
Gemini 3.1 Pro Preview · $2.00 in / $12.00 out

Price history

No price changes since we started tracking on Oct 8, 2026.

Questions

How much does o1 cost per month?: For a chatbot handling 10,000 requests a day with 1,000 input and 500 output tokens each, o1 costs about $13,500 per month at OpenAI's list prices ($15.00 per 1M input tokens, $60.00 per 1M output tokens).
Does o1 support prompt caching?: Yes. Cached input costs $7.50 per 1M tokens, compared with $15.00 for regular input.
How long is o1's context window?: o1 accepts up to 200,000 tokens (200K) of context and returns up to 100,000 tokens per response.