Claude 4.5 Haiku API

Anthropic’s fastest frontier model. Delivers Sonnet-class reasoning with extended thinking capabilities at a fraction of the cost. Ideal for real-time agents.

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Claude 4.5 Haiku API — Speed Meets Deep Reasoning

Experience the lowest latency in the Claude 4.5 family. Perfect for orchestrating sub-agents, powering live support, and executing massive batch workflows efficiently.

What can you build with Claude 4.5 Haiku API?

Real-Time Agentic Workflows

Orchestrate multi-step sub-agents with split-second responses.

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High-Volume Data Extraction

Process millions of documents with deterministic precision and low overhead.

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Interactive Coding Assistants

Power IDE plugins and dev tools with near-Sonnet coding proficiency.

Explore code

Why developers choose Claude 4.5 Haiku API

It breaks the trade-off between intelligence and speed, offering extended reasoning capabilities at production-scale pricing.

Unmatched Price-Performance

Matches older Sonnet models in coding/reasoning but costs significantly less.

Extended Thinking Mode

The first Haiku model to support deep reasoning chains for complex queries.

Enterprise-Grade Safety

Inherits the robust safety guardrails and alignment of the Claude 4.5 family.

How to integrate Claude 4.5 Haiku API

Streamline your deployment with unified endpoints and smart caching.

Step 1 — Set API credentials

Authenticate efficiently and select the 'claude-haiku-4.5' model identifier.

Step 2 — Enable Extended Thinking

Optional: Toggle reasoning parameters to boost performance on math or logic tasks.

Step 3 — Optimize with Caching

Cache system prompts and large contexts to reduce latency and token costs by up to 90%.

View API Docs

Core API Capabilities

Engineered for scalable automation

Latency

Blazing Speed

The fastest response times in the market for instant user interactions.

Pricing

Budget Friendly

Highly affordable input/output rates for high-frequency API calls.

Reasoning

Extended Thinking

Capable of 'showing its work' for complex reasoning tasks before answering.

Integration

Reliable Tool Use

State-of-the-art function calling for connecting to external APIs.

Multilingual

Global Linguistics

Fluent generation and understanding across major global languages.

Formatting

Structured Output

Native JSON mode ensures output matches your schemas perfectly.

Claude 4.5 Haiku API vs. The Family

Choosing the right model for your workload

Model	Duration	Resolution	Price	Strength
Claude 4.5 Haiku	N/A	N/A	Lowest (High Volume)	Fastest inference, sub-agents, simple coding, live chat.
Claude 4.5 Sonnet	N/A	N/A	Mid-Range	Complex orchestration, advanced coding, nuance.
Claude 4.5 Opus	N/A	N/A	Premium	Deepest research, maximum reasoning depth, creative writing.

Claude 4.5 Haiku API FAQs

Everything you need to know about the product and billing.

It remains the most affordable entry in the 4.5 line, optimized for volume. Check our pricing page for current per-million token rates.

Claude 4.5 Haiku API can now process internal chains of thought to solve harder logic puzzles and math problems, a feature previously reserved for Sonnet/Opus.

Yes, it rivals previous generation Sonnet models in coding benchmarks, making it excellent for code completion and refactoring.

Absolutely. You can cache repetitive contexts (like codebases or instruction manuals) to slash costs and latency.

Claude 4.5 Haiku API features an updated knowledge base extending into early 2025.