Claude Haiku 4.5 Blog

Mar 27, 2026

How to use thinking mode in claude 4.5

“Thinking mode” (also called extended thinking, thinking, or thinking blocks) in Claude 4.5 is an explicit, configurable operating mode that instructs the model to spend a separately budgeted number of tokens generating internal, step-by-step reasoning (a “chain-of-thought”) before emitting the final answer. It is designed to improve performance on multi-step reasoning, complex coding and agentic workflows, and research tasks by trading latency and token cost for deeper internal deliberation. Claude 4.5 exposes this capability at the Messages API level with explicit parameters (e.g., thinking / budget_tokens or an effort/“interleaved-thinking” header), preserves and optionally encrypts thinking blocks for later verification or tool use, and introduces cache and token-accounting behaviors you must manage when building production workloads.

Thinking mode in Claude 4.5: All You need to Know

Anthropic’s Claude 4.5 family (notably Sonnet 4.5 and Opus 4.5) brings extended “thinking” / scratchpad-style internal reasoning to their Claude 4 line. The Messages API exposes that capability through a thinking object (enable/disable + a budget_tokens allotment), streaming options, and special handling for “thinking” content blocks (including signatures and redaction). Sonnet 4.5 targets coding and agentic tasks and benefits heavily from extended thinking; Opus 4.5 adds preserved thinking blocks and other optimizations.

How to add Claude to an Alexa skill

Voice assistants are increasingly powered by large language models. If you want to bring Anthropic’s Claude API into an Alexa skill you maintain or build, this guide walks you through the practical architecture, concrete code patterns, and operational considerations you’ll need — from quick proof-of-concept to a production-grade skill.

Claude Haiku 4.5 API

Claude Haiku 4.5 is a purpose-optimized, smaller-class language model from Anthropic, released in mid-October 2025. It’s positioned as a fast, low-cost option in the Claude lineup that preserves strong capability on tasks like coding, agent orchestration, and interactive “computer-use” workflows while enabling much higher throughput and lower unit cost for enterprise deployments.

Claude Haiku 4.5 Blog

How to use thinking mode in claude 4.5

Thinking mode in Claude 4.5: All You need to Know

How to add Claude to an Alexa skill

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Claude Haiku 4.5 API

Claude Haiku 4.5 — near-frontier coding power at a fraction of the cost