OpenAI

o1

Public pricingLarge memoryDeep thinking

o1 is OpenAI's large-memory model with deep reasoning. This page shows current pricing, an interactive cost calculator, and a side-by-side with similar models.

Input

$15.00/1M tokens

Output

$60.00/1M tokens

Cached

$7.50/1M tokens

Batch

$7.50/1M tokens

Interactive

Calculate your o1 bill.

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

What would o1 cost you?

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Technical specifications

o1 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 o1

  • Multi-step reasoning, research agents, or hard math.
  • Long documents, full codebases, or extensive chat histories.

When to look elsewhere

  • Your workload involves images — pick a vision-capable model instead.
  • You need tool-use / function calling for agent workflows.

Alternatives

Similar models to compare.

FAQ

o1 — 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, o1 costs roughly $3,525 per month. Input is $15.00 /1M tokens and output is $60.00 /1M tokens.
o1 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, o1 supports deep step-by-step reasoning. It streams replies by default.
Models in a similar class include GPT-5 pro, o3, o1-mini. The "Similar models" section below this FAQ links into each.

Still unsure?

Compare o1 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.

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