推理強度和模型怎麼選最省 token？

Use the lowest reasoning effort that produces the result you need. Increase it for tasks that need more planning, analysis, or checking.

Higher reasoning effort can improve results for complex tasks, but it takes longer and uses more tokens.

Higher effort can use more of your allowance and does not always produce a better result.

Different models can use different amounts of your allowance for the same task. Larger inputs and outputs, higher reasoning settings, Fast mode and tasks with multiple steps can also increase usage.

Switch to a smaller model for routine tasks. Using GPT-5.6 Terra or GPT-5.6 Luna can extend your local-message usage limits, depending on the model you switch from.

For GPT-5.6, GPT-5.5, and GPT-5.4, Fast mode increases model speed by 1.5x. GPT-5.6 and GPT-5.5 consume credits at 2.5x the Standard rate; GPT-5.4 consumes credits at 2x the Standard rate.

Speed configurations increase credit consumption for all applicable models, so they also use included limits faster.

The effort level controls how much thinking Claude applies to a response. Higher effort means more thorough responses, but they take longer and use more tokens, so you'll reach your usage limits faster.

Reduces token usage for cost-sensitive work that can trade off some intelligence

Can improve performance on demanding tasks but may show diminishing returns and is prone to overthinking.

Sonnet handles most coding tasks well and costs less than Opus. Reserve Opus for complex architectural decisions or multi-step reasoning.

Thinking tokens are billed as output tokens, and the default budget can be tens of thousands of tokens per request depending on the model.

You are charged for all thinking tokens generated, even when collapsed or redacted.

You can use up to 50% of your weekly usage limits on Fable models at no extra cost. They draw from your plan's regular weekly usage limits and use them faster than other Claude models.

For Claude Code users on subscription plans (Pro/Max/Team/Enterprise), fast mode is available via usage credits only and not included in the subscription rate limits.