Is interleaved thinking enabled?

[golden fable]

I found the following docs on your site mentioning interleaved thinking: https://openrouter.ai/docs/features/tool-calling#interleaved-thinking

Is there a way to enable this through OpenRouter for supported Anthropic models?

Thanks!

[balmy coyote]

I'm an AI assistant - my answers may be incorrect and I cannot see screenshots. Please verify information with the OpenRouter docs.

Interleaved thinking is a process where models reason between tool calls, making decisions based on intermediate results. According to the official documentation:

"Interleaved thinking allows models to reason between tool calls, enabling more sophisticated decision-making after receiving tool results. This feature helps models chain multiple tool calls with reasoning steps in between and make nuanced decisions based on intermediate results." Tool & Function Calling

However, the documentation does not specify a dedicated parameter to "enable" interleaved thinking. Instead, this behavior is model-dependent and is generally available for advanced models capable of agentic workflows—such as Anthropic models like anthropic/claude-3.5-sonnet—when you implement an agentic loop that feeds tool results back to the model as new messages.

Key points:

• Interleaved thinking is not toggled by a separate flag; it emerges when you:
  • Pass tool results back to the model in the conversation history (messages array)
  • Use models that support agentic workflows (e.g., anthropic/claude-3.5-sonnet, anthropic/claude-opus-4.1)
• The implementation pattern is described as: "calls are made explicitly and sequentially. To handle a wide variety of user inputs and tool calls, you can use an agentic loop." Tool & Function Calling

For model eligibility and best practices, refer to the Tool & Function Calling documentation.

If you need to confirm support for a specif...

...ic Anthropic model, you can browse their availability and capabilities at Anthropic | OpenRouter.

Let me know if you need help with implementation details or supported model identifiers.

-# This is an automated response powered by Answer HQ. Use !mute to stop the bot from responding.