Conceptbetween_tools
between_tools
A field in the Messages API capabilities that indicates whether a model supports interleaving thinking between multiple tool calls during the thinking phase.
Timeline (last 90 days)
Oct 4
The SDK introduces a between_tools thinking type, allowing the model to reason between consecutive tool calls.
Unverified50%
Oct 4
When a fallback occurs, between_tools thinking is downgraded to the disabled state to ensure compatibility.
Unverified50%