> ## Documentation Index
> Fetch the complete documentation index at: https://arizeai-433a7140.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# 05.13.2026: Playground Thinking Controls for Anthropic and Google

> The Phoenix Playground now exposes first-class thinking controls for Anthropic extended thinking and Google thinking — token budgets, effort levels, and display toggles.

**Available in arize-phoenix 15.8.0+**

The Phoenix Playground now surfaces dedicated controls for extended thinking on Anthropic and Google models. Thinking parameters are persisted with saved prompts and restored correctly on reload or provider switch.

## Anthropic Extended Thinking

Three controls appear when an Anthropic model is selected:

* **Thinking** — choose between **Adaptive** (model decides when to think), **Enabled** (always think), or disabled. Adaptive mode is the default for new instances.
* **Thinking Budget** — token budget allocated for the thinking block. Minimum is 1,024 tokens; maximum is capped by the `max_tokens` setting. Defaults to 5,000.
* **Thinking Display** — toggle whether the thinking block is shown inline in the Playground response panel.

Anthropic also exposes an **Effort** control (low / medium / high) for models that support output-confidence effort levels independently of extended thinking.

## Google Thinking

For Google Gemini models:

* **Thinking Budget** — maximum tokens the model may spend on internal reasoning before emitting the response.
* **Thinking Level** — preset effort level (`LOW`, `MEDIUM`, `HIGH`). Overrides the budget when set.

Thinking parameters are saved as part of the prompt version and round-tripped through storage and the SDK export format. Switching to a provider that does not support thinking drops the thinking config automatically; switching back restores it.