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o1 token cost

OpenAI · context 200,000 tokens · tokenizer Exact

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When to use o1

Legacy high-cost OpenAI reasoning model kept for historical budget comparisons. Prefer o3 or GPT-5 reasoning paths for new work unless you are pinned to o1.

Pricing

Input
$15.00/1M
Output
$60.00/1M
Cached input
$7.50/1M
Verified

Official pricing source · Open main calculator · Cheaper frontier models

Reasoning tokens billed at output rate.

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Preselect o1 in the calculator to count tokens and project request or monthly cost. Exact vs Approx follows this model's tokenizer family. See the Exact vs Approx guide for honesty rules.

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Related guides

LLM API pricing · Exact vs Approx · OpenAI token calculator · o200k vs cl100k: which OpenAI encoding counts your text?

Sources and references

Official documentation used for definitions, counting methods, or rate cards. Always confirm critical budgets on the provider page.