How much does o3 cost per 1M tokens?

Input is priced at $3.57 per 1M tokens, output at $14.28 per 1M tokens. Billing is per token, no rounding to batch sizes.

How do I access o3 via API?

Send requests to the UnoRouter /v1/chat/completions endpoint with model=o3. Any OpenAI-compatible client library works. Authentication uses a standard Bearer token.

What is the context window of o3?

o3 supports a context window of 200K tokens, shared between your prompt and the model's response.

OpenAI: o3

Name: o3
Brand: OpenAI

200K context100K outReasoningToolsVisionFilesCacheStructured

Released Apr 16, 2025Knowledge cutoff 2024Updated Apr 16, 2025

o3 is a well-rounded and powerful model across domains. It sets a new standard for math, science, coding, and visual reasoning tasks. It also excels at technical writing and instruction-following. Use it to think through multi-step problems that involve analysis across text, code, and images.

Mode chatTokenizer GPTModerated

All providers for this model are busy right now

Every upstream provider has hit its rate limit. The model comes back automatically once limits lift, usually within hours. Try again in a little while or switch to another model.

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Pricing

Input price

$3.57/ 1M tokens

Output price

$14.28/ 1M tokens

Context window 200K tokensCompatible endpoints openaiVendor OpenAI

Performance

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Usage & Ranking

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Supported parameters

All providers = every upstream serving this model supports it. Some providers = depends on which upstream handles the request. Default = the value sent when you leave the parameter unset.

Parameter	Providers	Default
include_reasoning	All providers	-
max_tokens	All providers	-
reasoning	All providers	-
response_format	All providers	-
seed	All providers	-
structured_outputs	All providers	-
tool_choice	All providers	-
tools	All providers	-

Frequently asked questions

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