How much does o3 cost per month?

For a chatbot handling 10,000 requests a day with 1,000 input and 500 output tokens each, o3 costs about $1,800 per month at the provider's official prices (verified) ($2.00 per 1M input tokens, $8.00 per 1M output tokens).

Does o3 support prompt caching?

Yes. Cached input costs $0.50 per 1M tokens, compared with $2.00 for regular input.

How long is o3's context window?

o3 accepts up to 200,000 tokens (200K) of context and returns up to 100,000 tokens per response.

Does o3 have a batch price?

Yes. Asynchronous batch requests cost $1.00 per 1M input tokens and $4.00 per 1M output tokens.

o3 API Pricing

OpenAI · released Apr 16, 2025 · 200K context · API model ID o3

o3 by OpenAI API pricing: $2.00 per 1M input tokens and $8.00 per 1M output tokens (verified against the official pricing page, Oct 9, 2026).

Prices

o3 prices, USD per 1M tokens
Price	USD per 1M tokens
Input	$2.00
Output	$8.00
Cache read	$0.50
Cache write	Not published
Batch input	$1.00
Batch output	$4.00

Verified against the provider's official pricing page on Oct 9, 2026. Official pricing page

Estimated monthly cost

$1,800

per month

per day: $60.00
per request: $0.006

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	$1,800/mo
RAG8,000 in / 500 out tokens, 5,000 requests a day	$3,000/mo
Coding agent50,000 in / 2,000 out tokens, 1,000 requests a day, 80% cached input	$1,680/mo

Context and capabilities

Context: 200,000 tokens
Max output: 100,000 tokens
Input: text, image, pdf
Output: text
Knowledge cutoff: May 2024
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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Qwen3.8 Max · $2.00 in / $6.00 out
Mistral Medium 3.5 · $1.50 in / $7.50 out

Price history

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

Questions

How much does o3 cost per month?: For a chatbot handling 10,000 requests a day with 1,000 input and 500 output tokens each, o3 costs about $1,800 per month at the provider's official prices (verified) ($2.00 per 1M input tokens, $8.00 per 1M output tokens).
Does o3 support prompt caching?: Yes. Cached input costs $0.50 per 1M tokens, compared with $2.00 for regular input.
How long is o3's context window?: o3 accepts up to 200,000 tokens (200K) of context and returns up to 100,000 tokens per response.
Does o3 have a batch price?: Yes. Asynchronous batch requests cost $1.00 per 1M input tokens and $4.00 per 1M output tokens.