How much does o4-mini cost per month?

For a chatbot handling 10,000 requests a day with 1,000 input and 500 output tokens each, o4-mini costs about $990.00 per month at OpenAI's list prices ($1.10 per 1M input tokens, $4.40 per 1M output tokens).

Does o4-mini support prompt caching?

Yes. Cached input costs $0.275 per 1M tokens, compared with $1.10 for regular input.

How long is o4-mini's context window?

o4-mini accepts up to 200,000 tokens (200K) of context and returns up to 100,000 tokens per response.

o4-mini 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 Apr 16, 2025 · 200K context · API model ID o4-mini

o4-mini by OpenAI API pricing: $1.10 per 1M input tokens and $4.40 per 1M output tokens (provider list price via models.dev, Oct 10, 2026).

Prices

o4-mini prices, USD per 1M tokens
Price	USD per 1M tokens
Input	$1.10
Output	$4.40
Cache read	$0.275
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

$990.00

per month

per day: $33.00
per request: $0.0033

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	$990.00/mo
RAG8,000 in / 500 out tokens, 5,000 requests a day	$1,650/mo
Coding agent50,000 in / 2,000 out tokens, 1,000 requests a day, 80% cached input	$924.00/mo

Context and capabilities

Context: 200,000 tokens
Max output: 100,000 tokens
Input: text, image
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

DeepSeek V4 Pro · $1.32 in / $3.96 out
Muse Spark 1.3 · $1.25 in / $4.25 out
Gemini 3.8 Flash · $0.75 in / $3.75 out
Grok Build 0.1 · $1.00 in / $2.00 out

Price history

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

Questions

How much does o4-mini cost per month?: For a chatbot handling 10,000 requests a day with 1,000 input and 500 output tokens each, o4-mini costs about $990.00 per month at OpenAI's list prices ($1.10 per 1M input tokens, $4.40 per 1M output tokens).
Does o4-mini support prompt caching?: Yes. Cached input costs $0.275 per 1M tokens, compared with $1.10 for regular input.
How long is o4-mini's context window?: o4-mini accepts up to 200,000 tokens (200K) of context and returns up to 100,000 tokens per response.