Adaptive thinking
Adaptive thinking is an inference-time reasoning mode in the Anthropic Messages API in which a claude model decides, on a per-request basis, whether to use extended thinking at all and how much of it to spend
Reasoning Models
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Claude Opus 5
Claude Opus 5 is a large language model released by Anthropic on 24 July 2026, the newest entry in the Claude Opus line and the successor to Claude Opus 4.8.
Extended thinking
Extended thinking is the product name Anthropic gives to the reasoning mode in its Claude family of large language models
Interleaved thinking
Interleaved thinking is a feature of the Anthropic Messages API that lets Claude produce extended reasoning blocks between tool calls inside a single multi-turn agentic loop