# C06 — Reasoning models

- Publisher: OpenAI
- Source: [Reasoning models](https://developers.openai.com/api/docs/guides/reasoning)
- Published: Not stated / not established
- Updated: Not stated / not established
- Accessed: 2026-10-22
- Type: Official implementation documentation
- Evidence: opened primary page; relevant content read.

## Paraphrased finding

Reasoning tokens are billed within output tokens. Output limits include reasoning and can be reached before a visible answer.

## Limits

Do not add reasoning tokens twice to an output total. Behavior and context handling vary by model.