o3

OpenAI's reasoning model following o1, released April 2025, and the first of its reasoning models to combine tools agentically.

Context: 200K tokens
Max output: 100K
Cutoff: Jun 2024
Released: Apr 2025

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Hosted API price

List price via OpenAI · per 1M tokens

USD

Input: $2.00 /1M
Output: $8.00 /1M
Hosted by: 3 providers

Hosted API pricing

How we price

Order

Providers are listed cheapest input rate first, then by output rate, a tie going to the creator's own listing. A provider that lists the model without a published rate sits at the end.

Prices

Base-tier, on-demand rates in USD per 1M tokens, converted at ECB reference rates where a provider publishes in another currency. Cached-input and batch rates show only where a provider publishes them. "Cheapest" marks the one provider with the lowest input and output pair; a tie wears no badge.

Cost

Input rate times the input tokens plus output rate times the output tokens, at the monthly volume set above the table. Cached-input, batch, long-context and reasoning-token billing are not modelled.

Transparency and funding

Affiliates: Affiliate links are marked. We may earn a commission if you click them, but commissions never affect the order.

Every provider serving o3, cheapest input first. Set your monthly volume to see what each would bill.

Input M Output M

Every provider serving o3, with its price per 1M input and output tokens and what the volume above would cost
Provider	Input /1M	Output /1M	Cached input /1M	Cost at 10M in + 2M out	Link
OpenAI Creator	$2.00	$8.00	$0.50	$36.00	Visit website
DigitalOcean	$2.00	$8.00	$0.50	$36.00	Visit website
Azure	$2.00	$8.00	$0.50	$36.00	Visit website

Heads up: Base-tier, on-demand rates per 1M tokens; cached, batch and long-context tiers excluded. A provider may serve a shorter context or a quantized build than the creator's release. Verify before provisioning. More on how we price.

Similarly priced models

The models nearest o3 by blended rate, each at its own cheapest provider.

Models priced nearest o3 per 1M tokens, each at its cheapest provider
Model	Blended /1M	Input /1M	Output /1M	Context	Cutoff	vs o3
Gemini 2.5 Pro Google Cloud	$2.7083	$1.25	$10.00	1M	Jan 2025	−10%
GPT-5 OpenAI	$2.7083	$1.25	$10.00	400K	Sep 2024	−10%
GPT-5.1 OpenAI	$2.7083	$1.25	$10.00	400K	Sep 2024	−10%
Gemini 3.5 Flash Google Cloud	$2.75	$1.50	$9.00	1M		−8%
GPT-4.1 OpenAI	$3.00	$2.00	$8.00	1M	Jun 2024	0%
o3 This model OpenAI	$3.00	$2.00	$8.00	200K	Jun 2024
Claude Sonnet 5 Anthropic	$3.3333	$2.00	$10.00	1M	Jan 2026	+11%
Claude Sonnet 5.5 Anthropic	$3.3333	$2.00	$10.00	1M	Jun 2026	+11%
Gemini 4 Argon Google Cloud	$3.3333	$2.00	$10.00			+11%
GPT-5.6 Sol OpenAI	$3.3333	$2.00	$10.00	1M	Feb 2026	+11%
GPT-6 Sol OpenAI	$3.3333	$2.00	$10.00	1M	Apr 2026	+11%

USD per 1M tokens at each model's cheapest listed provider. Blended is the cost of 10M input plus 2M output tokens, spread over the 12M.

Salad

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Per-second billing, with no charge for cold starts or image pulls

View Pricing

Capabilities

What o3 accepts and can do, as published by OpenAI.

Text Accepts and generates natural-language text.
Image Accepts images as input alongside text.
Reasoning Thinks before it answers, always on or as a switchable mode.
Function calling Connect to external tools, APIs, and systems.
Structured output Return responses in structured formats like JSON.
Web search Search the web for up-to-date information.
Code execution Write and execute code in a sandboxed environment.
File upload Process uploaded documents, spreadsheets, and other files.
MCP Connect to services via Model Context Protocol.
Image generation Generate and edit images from text prompts.

Common questions

What is o3 good for?

Multi-step problems that mix text, code and images with tool use. OpenAI calls it the first of its reasoning models to combine tools agentically, mid-priced in the lineup.

When is o3 not a good fit?

Long-lived deployments: OpenAI says GPT-5 succeeds it and plans to shut it down in December 2026. Its knowledge is older and its inputs shorter than the GPT-5 line's.

What is the cheapest way to run o3?

The cheapest hosted rate is $2.00 / $8.00 per 1M tokens via OpenAI.

How does o3 compare with o1?

OpenAI says o3 is a step up from o1 in tool use: it is trained to call tools inside its chain of thought, deciding when and how to use them, and can work with images as part of its reasoning, cropping or rotating them as it thinks. Same 200K-token context and text and image input. o3 lists at 87% less per 1M input tokens and 87% less per 1M output tokens than o1. It came out 4 months later and has a newer knowledge cutoff (June 2024 against October 2023).

Can I self-host o3?

No. OpenAI does not publish the weights; o3 is available only through hosted APIs.