---
title: "o3 — LLM-TEST.com"
url: /models/o3/
canonical_url: https://llm-test.com/models/o3/
language: en
type: model
summary: "A dedicated reasoning model that thinks before it answers, strong on math, science and multi-step logic. Favored where careful deliberation matters more than raw speed."
last_updated: "2026-11-05"
---

# o3

_OpenAI · Reasoning_

A dedicated reasoning model that thinks before it answers, strong on math, science and multi-step logic. Favored where careful deliberation matters more than raw speed.

## At a glance

- Released: Apr 16, 2025
- Provider: OpenAI
- Context window: 200,000 tokens
- Max output: 100,000 tokens
- Modalities: Text + image → text
- Knowledge cutoff: March 2024
- API model ID: `o3`
- License: Proprietary (API only)

## Pricing

- Standard: $2 input / $8 output per 1M tokens
- Batch: $1 input / $4 output per 1M tokens
- Example: a 1,500-token prompt + 650-token answer ≈ $0.008 (standard)

## What's new vs o1 (December 2024)

- Stronger step-by-step reasoning than o1
- Better tool use during thinking
- Improved math and coding accuracy
- Slower due to extended reasoning
- Higher token use on hard problems

## Best use cases

- **Math and science** — Works through rigorous quantitative problems carefully.
- **Complex planning** — Breaks down multi-step tasks before acting.
- **Hard debugging** — Reasons through subtle code and logic faults.

## Strengths

- Strong deliberate reasoning
- Good at math
- Reliable tool use
- Accurate on hard tasks

## Limitations

- Slower responses
- Higher reasoning-token cost

## Where to get access

- Consumer app: ChatGPT (web, desktop, mobile) — https://chatgpt.com
- API: the OpenAI Platform — https://platform.openai.com
- Also available: Microsoft Azure OpenAI Service
- Docs: https://platform.openai.com/docs

Full comparison and live pricing: https://llm-test.com/ · directory: https://llm-test.com/models/