Claude Haiku
Learn more about Claude Haiku, Anthropic's fastest and cheapest AI model. Discover its key features, enterprise use cases, and how it compares to other models i...
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Claude Haiku
AI Models
+5
Claude Haiku 4.5 is a lightweight, fast AI model optimised for cost efficiency and low latency, developed by Anthropic and released in October 2025. It is a proprietary closed-weight model, available through the Anthropic API. It supports a 200K-token context window, adequate for most documents and multi-turn applications.
On the FlowHunt AI Leaderboard it is one of 24 tracked models. Benchmark data for this model is currently limited.
Claude Haiku 4.5 was released on October 1, 2025 as Anthropic’s lightweight, high-throughput model for the Claude 4 generation. The Haiku tier is purpose-built for latency-sensitive, high-volume workloads: customer support routing, real-time content moderation, tool-calling in agentic pipelines where inference speed matters more than peak capability, and applications running millions of requests per day where Opus or Sonnet pricing would be prohibitive. Haiku 4.5 supports a 200K-token context window — smaller than the 1M window of the heavier Claude 4 models but sufficient for most document-level tasks and substantially larger than previous-generation Haiku variants.
Note: Fastest and most cost-efficient Claude model. Best for high-volume tasks.
- Released
- October 2025
- Context
- 200K tokens
- Weights
- Closed
- Tier
- Efficient
- Provider
- Anthropic
About Anthropic
Anthropic is an AI safety company founded in 2021 by former OpenAI researchers Dario Amodei and Daniela Amodei, along with a group of colleagues who had led OpenAI's safety and policy teams. The company's stated mission is the responsible development of AI for the long-term benefit of humanity, and its research agenda is defined by that commitment: Constitutional AI (CAI), a technique for training models to be helpful, harmless, and honest through self-critique; mechanistic interpretability, which aims to reverse-engineer what individual neurons and circuits inside large networks actually compute; and scaling science, which tries to predict how model behaviour changes with compute and data. Anthropic publishes this research openly and has become one of the most cited AI safety labs in academic literature. Claude is Anthropic's public model family — named for Claude Shannon, the founder of information theory — and spans four generations (1 through 4.x/Fable 5). Anthropic operates a commercial API and consumer-facing Claude.ai product, and maintains deep cloud partnerships with AWS (Amazon Bedrock) and Google Cloud (Vertex AI).
Strengths & Limitations
Strengths
- Long-context tasks (200K context window)
Limitations
- Limited public benchmark data — evaluation coverage is still emerging
- Closed-weight — cannot be self-hosted or fine-tuned on private data
Browse the Full AI Model Leaderboard
Compare all 24 models across 11 benchmarks — sortable, sourced, and updated June 2026.
Frequently asked questions
Learn more
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