OpenAI: o4 Mini API Pricing
OpenAI: o4 Mini costs $1.10 per 1M input tokens and $4.40 per 1M output tokens (cache reads: $0.275). Context window: 200K. Prices verified 2026-10-21 · source
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Token economics
| Token type | Price | vs base input |
|---|---|---|
| Standard input | $1.10 | — |
| Cache read | $0.275 | −75% |
| Output | $4.40 | — |
| Web search tool | $10/1k searches | — |
Prompt caching stores repeated context server-side: reads cost far less, but writes carry a one-time premium.
Higher effort = deeper thinking = more reasoning tokens billed as output.
Training data ends here — newer events require retrieval or web search.
What would OpenAI: o4 Mini cost you per month?
| Workload | Requests/mo | Avg tokens (in/out) | Est. monthly cost |
|---|---|---|---|
| Light chatbot | 10,000 | 800 / 400 | $26.40 |
| Coding agent | 5,000 | 8,000 / 2,000 | $88.00 |
| RAG pipeline | 30,000 | 4,000 / 500 | $198.00 |
| Doc summarizer | 2,000 | 20,000 / 1,000 | $52.80 |
Estimates use list prices without prompt caching. Caching can cut input cost by up to 90% on repeated context.
About OpenAI: o4 Mini
OpenAI o4-mini is a compact reasoning model in the o-series, optimized for fast, cost-efficient performance while retaining strong multimodal and agentic capabilities. It supports tool use and demonstrates competitive reasoning...
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Frequently asked questions
How much does OpenAI: o4 Mini cost?
OpenAI: o4 Mini costs $1.10 per 1M input tokens and $4.40 per 1M output tokens; cached input tokens cost $0.275 per 1M. Verified 2026-10-21 — provider source.
What is the context window?
200K tokens, with up to 100K output tokens per response. That's roughly 250 pages of text in a single request.
Does it support prompt caching?
Yes — cached input is $0.275/1M, about 75% cheaper than standard input. Agents and RAG workloads with repeated context benefit most.
What's a cheaper alternative?
ScaleDown: Summarize saves about 99% on a typical workload with comparable quality.
Official resources
- OpenAI: o4 Mini on OpenRouter — live endpoint, pricing source of record.
- Artificial Analysis leaderboard → — independent intelligence and performance rankings.
- OpenAI pricing → — first-party pricing and billing details.
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