Do thinking tokens cost extra?

Thinking tokens are billed as output tokens since the model generates them. A task that produces 200 visible tokens might use 2,000 thinking tokens behind the scenes—so the total billed output is 2,200 tokens. This makes reasoning-heavy tasks more expensive per visible token, but the accuracy improvement often justifies the cost. Some providers offer thinking token budgets to cap this cost.

Thinking Tokens

Written by Max Zeshut

Founder at Agentmelt

Tokens generated by an AI model during an extended reasoning process that are used internally for step-by-step problem-solving but are not shown to the end user. Also called 'reasoning tokens' or 'thinking budget,' these tokens represent the model's intermediate reasoning—similar to scratch work on a math problem. Models like Claude (extended thinking) and OpenAI's o-series use thinking tokens to improve accuracy on complex tasks. Thinking tokens count toward the model's output token usage and billing, but give the model space to reason through multi-step problems, check its work, and consider alternatives before producing a final answer.

Пример

A legal agent asked to analyze a complex contract clause uses 2,000 thinking tokens to work through the implications: identifying relevant precedents, considering edge cases, evaluating risk from multiple angles, and checking its reasoning before producing a concise 200-token analysis for the lawyer. The thinking tokens aren't shown to the user but dramatically improve the quality and accuracy of the final output.

Часто задаваемые вопросы

Do thinking tokens cost extra?: Thinking tokens are billed as output tokens since the model generates them. A task that produces 200 visible tokens might use 2,000 thinking tokens behind the scenes—so the total billed output is 2,200 tokens. This makes reasoning-heavy tasks more expensive per visible token, but the accuracy improvement often justifies the cost. Some providers offer thinking token budgets to cap this cost.

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