Claude Haiku 4.5

Overview

Claude Haiku 4.5 is Anthropic's fastest and most cost-efficient model, designed for high-volume deployments where speed and low cost matter more than maximum capability. Released in October 2025, Haiku 4.5 represents a significant leap over its predecessor — it matches the performance of the previous mid-tier Claude Sonnet 4 on coding, computer use, and agent tasks while retaining the sub-second latency that makes Haiku ideal for real-time applications.

Haiku 4.5 is the right choice for tasks that need to happen at scale: chatbots handling thousands of concurrent conversations, inline code suggestions, content classification, document summarization pipelines, and any agentic workflow that needs a fast, cheap sub-agent for routine subtasks. At $1 per million input tokens, it brings frontier-class capabilities to price points that were previously only accessible with much weaker models.

Specifications

• Developer: Anthropic
• Model String: claude-haiku-4-5-20251001
• Release Date: October 2025
• Type: Large Language Model (LLM), Multimodal (text + vision)
• Context Window: 200,000 tokens
• Max Output: 8,192 tokens
• Access: Anthropic API, Amazon Bedrock, Google Cloud Vertex AI, Claude.ai
• Pricing: $1 per million input tokens / $5 per million output tokens

Capabilities

Haiku 4.5 is optimized for speed and cost efficiency without sacrificing the core intelligence needed for most real-world tasks. It matches Claude Sonnet 4's performance on coding benchmarks, handles computer use tasks, and operates effectively in multi-step agentic workflows. It supports vision (image analysis), tool use, and function calling — all the building blocks needed for production AI applications.

Its primary advantage is throughput: it can process requests significantly faster than Sonnet or Opus models, making it the preferred choice in latency-sensitive contexts or high-volume pipelines where Sonnet-class reasoning isn't required.

Limitations

Haiku 4.5 is not the right choice for complex multi-step reasoning, nuanced long-form writing, or tasks requiring deep analysis. For hard coding problems, ambiguous instructions, or anything requiring sustained reasoning over long contexts, Sonnet or Opus will outperform it. Think of Haiku as the specialist for volume and speed — not for depth.

Recent Developments

• October 2025 Release: Haiku 4.5 launched with a notable capability jump over Haiku 3, matching Sonnet 4 on key benchmarks despite being a fraction of the cost.
• Agentic Use Cases: Anthropic has highlighted Haiku 4.5 as a strong sub-agent in multi-agent pipelines — fast enough to handle routine subtasks while Sonnet or Opus handles orchestration and complex reasoning.

Last Updated

February 26, 2026