OpenAI

o4-mini

Public pricingLarge memoryDeep thinkingTool use

o4-mini is OpenAI's large-memory model with deep reasoning, tool use. This page shows current pricing, an interactive cost calculator, and a side-by-side with similar models.

Input

$0.40/1M tokens

Output

$1.60/1M tokens

Cached

—

Batch

—

Interactive

Calculate your o4-mini bill.

Adjust the workload below and watch the monthly cost update in real time.

What would o4-mini cost you?

Adjust the workload to see your monthly bill.

1,00010,00050,000250,0001M10M

Technical specifications

o4-mini at a glance.

Memory

200,000

tokens

Max reply

32,768

tokens

Memory tier

Large

an entire book or large codebase

Tokenizer

tiktoken-o200k

Released

—

Training cutoff

—

Availability

Public pricing

Status

active

What it can do

Capabilities & limits.

  • Understands images
  • Deep step-by-step thinking
  • Uses tools / calls functions
  • Strict JSON output
  • Streams replies
  • Fine-tunable on your data

When to pick o4-mini

  • Multi-step reasoning, research agents, or hard math.
  • Agentic workflows that call tools or APIs.
  • Long documents, full codebases, or extensive chat histories.
  • High-volume workloads where unit cost matters.

When to look elsewhere

  • Your workload involves images — pick a vision-capable model instead.

Alternatives

Similar models to compare.

FAQ

o4-mini — the questions we see most.

Pricing, capabilities, alternatives — generated from the same data that powers the calculator above.

Get instant answers from our AI agent

At a typical workload of 50,000 conversations a month with 1,500-token prompts and 800-token replies, o4-mini costs roughly $94 per month. Input is $0.40 /1M tokens and output is $1.60 /1M tokens.
o4-mini has a 200,000-token context window (large memory — an entire book or large codebase). That means you can fit about 37,500 words of input and history in a single call.
Beyond text generation, o4-mini supports deep step-by-step reasoning, calling functions / tools, strict JSON output. It streams replies by default.
Models in a similar class include GPT-5 mini, gpt-oss-120B, o3-mini. The "Similar models" section below this FAQ links into each.

Still unsure?

Compare o4-mini against 100+ other models.

Open the full wizard — pick a use case, set your usage, and see side-by-side monthly costs in under a minute.

Open the comparison wizardBook a call