OpenAI

o3

Public pricingLarge memoryDeep thinkingTool use

o3 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

$10.00/1M tokens

Output

$40.00/1M tokens

Cached

$2.50/1M tokens

Batch

$5.00/1M tokens

Interactive

Calculate your o3 bill.

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

What would o3 cost you?

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Technical specifications

o3 at a glance.

Memory

200,000

tokens

Max reply

100,000

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 o3

  • Multi-step reasoning, research agents, or hard math.
  • Agentic workflows that call tools or APIs.
  • Long documents, full codebases, or extensive chat histories.

When to look elsewhere

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

Alternatives

Similar models to compare.

FAQ

o3 — 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, o3 costs roughly $2,350 per month. Input is $10.00 /1M tokens and output is $40.00 /1M tokens.
o3 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, o3 supports deep step-by-step reasoning, calling functions / tools. It streams replies by default.
Models in a similar class include GPT-5 pro, GPT-5, GPT-5.1. The "Similar models" section below this FAQ links into each.

Still unsure?

Compare o3 against 100+ other models.

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