Claude Haiku 4.5

Claude Haiku 4.5 is the fastest and most cost-effective model in the Claude 4 family, purpose-built for real-time response, high-concurrency processing, and large-scale lightweight workloads. It keeps the core capabilities of the Claude 4 line (vision, tool use, instruction following) while pushing latency and per-token cost to a minimum — the foundation for cost-efficient production systems.

Core Capabilities Very low latency: Significantly faster time-to-first-token and overall throughput than Sonnet and Opus — ideal for real-time interaction. Very low cost: The cheapest per-token model in the 4 family — well suited for high-volume workloads. 200K context window: More than enough for the vast majority of lightweight tasks. Vision input: Supports images for lightweight OCR, classification, and content moderation. Computer use: Compatible with the computer-use-2025-01-24 beta header for upstream steps in browser automation. Instruction following: A substantial step up from the previous Haiku — reliably follows structured instructions. Technical Specifications Model ID: claude-haiku-4-5-20251001 Context window: 200,000 tokens Multimodal: Text + image input, text output Positioning: The speed-and-cost workhorse of the 4 family Typical Use Cases Real-time chatbot front-ends and dialogue routing Bulk text classification, sentiment analysis, and intent recognition Structured data extraction (fields from emails, forms, documents) Content moderation and first-pass filtering Lightweight sub-tasks in RAG systems such as query rewriting and document summarization The "triage" stage of agentic workflows — Haiku for first-pass screening, escalating complex requests to Sonnet/Opus High-concurrency applications with millions of calls per day Recommendations A common high-efficiency pattern in production is a three-tier cascade: Haiku 4.5 for upstream classification and lightweight processing, Sonnet 4.6 for the core business logic, and Opus 4.7 only for the highest-stakes decisions. This controls total cost while preserving quality where it matters. Avoid Haiku for tasks requiring complex multi-step reasoning, deep code generation, or long-context synthesis — those belong to Sonnet or Opus.

Available On Claude API, Claude Platform on AWS, Amazon Bedrock, Google Vertex AI, and Microsoft Foundry.