claude-prompting-best-practices changedbuild-with-claude/prompt-engineering/claude-prompting-best-practices
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545545Claude's latest models offer thinking capabilities that can be especially helpful for tasks involving reflection after tool use or complex multistep reasoning. You can guide its initial or interleaved thinking for better results.
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547Claude 4.6 and later models and Claude Mythos Preview use [adaptive thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) (`thinking: {type: "adaptive"}`), where Claude dynamically decides when and how much to think. On Claude Fable 5.1, Claude Mythos 5.1, Claude Fable 5, Claude Mythos 5, and Claude Opus 5.5, thinking is always on and adaptive thinking is the only mode. Claude calibrates its thinking based on two factors: the `effort` parameter and query complexity. Higher effort elicits more thinking, and more complex queries do the same. On easier queries that don't require thinking, the model responds directly. In internal evaluations, adaptive thinking reliably drives better performance than extended thinking. Consider moving to adaptive thinking.
547Claude 4.6 and later models and Claude Mythos Preview use [adaptive thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) (`thinking: {type: "adaptive"}`), where Claude dynamically determines when and how much to think. On Claude Fable 5.1, Claude Mythos 5.1, Claude Fable 5, Claude Mythos 5, and Claude Opus 5.5, thinking is always on and adaptive thinking is the only mode. Claude calibrates its thinking based on two factors: the `effort` parameter and query complexity. Higher effort elicits more thinking, and more complex queries do the same. On easier queries that don't require thinking, the model responds directly. In internal evaluations, adaptive thinking reliably drives better performance than extended thinking. Consider moving to adaptive thinking.
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549549Use adaptive thinking for workloads that require agentic behavior such as multistep tool use, complex coding tasks, and long-horizon agent loops. Older models use manual [extended thinking](https://platform.claude.com/docs/en/build-with-claude/extended-thinking) with `budget_tokens`; see the [per-model configuration table](https://platform.claude.com/docs/en/build-with-claude/thinking-troubleshooting#supported-models) for which configuration each model accepts.
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797797#### Context awareness and multiwindow workflows
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799Claude Sonnet 5, Claude Sonnet 4.6, Claude Sonnet 4.5, and Claude Haiku 4.5 feature [context awareness](https://platform.claude.com/docs/en/build-with-claude/context-windows#context-awareness), enabling the model to track its remaining context window (that is, its "token budget") throughout a conversation. This enables Claude to execute tasks and manage context more effectively by understanding how much space it has to work.
799Claude Sonnet 5, Claude Sonnet 4.6, Claude Sonnet 4.5 (deprecated), and Claude Haiku 4.5 feature [context awareness](https://platform.claude.com/docs/en/build-with-claude/context-windows#context-awareness), enabling the model to track its remaining context window (that is, its "token budget") throughout a conversation. This enables Claude to execute tasks and manage context more effectively by understanding how much space it has to work.
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801801**Managing context limits:**
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