OpenAI

OpenAI o4-mini

A fast, cost-efficient reasoning model on a 200K-token context window. Succeeded by GPT-5 mini.

ActiveReleased April 16, 2025Knowledge cutoff June 1, 2024Available from 4 providers
Tool callingCan invoke external tools and APIs (function calling) mid-response.Structured outputCan return JSON or schema-constrained responses instead of free text.ReasoningUses extended thinking / chain-of-thought for harder multi-step problems.Effort controlLets you dial thinking depth (low / medium / high) to trade cost for quality.Fine-tuningSupports training a custom variant on your own data (vendor fine-tune API or self-hosted open weights).

Source: OpenAI models, OpenAI pricing, Prompt caching (1,024 minimum, 30m TTL)

Price per 1M tokens
$1.1 in / $4.4 out
Context window200,000
Max output100,000
Cache read$0.275 / M
Batch discount-50%
Input
  • Text
  • Image
Output
  • Text
Priced across4 providers

Pricing

Every billing leg from the live catalog, in USD per 1M tokens.

Billing legRateBatch
Input$1.1 / M$0.55 / M
Output$4.4 / M$2.2 / M
Cache read$0.275 / Mn/a

Cost calculator

Billing-grade math over the rate card above, including the thinking tokens most estimates miss.

Hidden reasoning tokens bill as output. 1.0x = thinking off. Medium-effort reasoning typically lands near 3x; heavy reasoning runs 6x to 8x. Set it to match your workload.

Estimated monthly cost
$484
at current list prices
Fresh input$220
Cached input$0.00
Output incl. thinking$264
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Compare providers

The same model, priced across every platform that serves it. Lowest combined in/out rate is flagged.

PlatformRegionInput / MOutput / MCache read / MBatchAccess
OpenAILowest
-$1.1$4.4$0.275✓First-party API
Azure OpenAI
-$1.1$4.4$0.275✓Direct
Azure OpenAI · Data zone
-$1.21$4.84$0.303✓Direct
Azure OpenAI · Regional
$1.21$4.84$0.303-Direct

Some hosts price by region. Shown rates match the selected region.

Price history

Has this model gotten cheaper or more expensive?

EffectiveInput / OutputStatus
April 20, 2026 – July 10, 2026$1.1 / $4.4past
July 10, 2026 – August 3, 2026$1.1 / $4.4past
August 3, 2026$1.1 / $4.4current

More from OpenAI

Other models from the same provider.

GPT-6.1 Sol
openai/gpt-6.1-sol
$2 / $10 in / out per 1M
GPT-6 Sol
openai/gpt-6-sol
$2 / $10 in / out per 1M
GPT-6 Luna
openai/gpt-6-luna
$0.1 / $0.5 in / out per 1M
GPT-6 Astra
openai/gpt-6-astra
$10 / $50 in / out per 1M
GPT-5.6 Sol
openai/gpt-5.6-sol
$4 / $20 in / out per 1M
GPT-5.6 Terra
openai/gpt-5.6-terra
$2 / $12 in / out per 1M

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Rates are generated from SuperPenguin's live pricing catalog.