The architecture is optimized to handle long contexts and complex multi-agent workflows with minimal latency, making it highly suitable for real-time applications requiring both speed and reliability.
Claude 4.5 Haiku delivers near-leading capabilities in coding and reasoning while running significantly faster and at a much lower cost compared to larger models.
Overview
Claude 4.5 Haiku is Anthropic's latest lightweight AI model offering near-frontier-level capabilities with remarkable speed and cost efficiency. Designed to power real-time, interactive applications such as chat assistants, coding tools, and multi-agent workflows, it advances AI accessibility by delivering state-of-the-art performance at a fraction of the cost and with much lower latency.
Technical Specifications
Model Class: Lightweight variant of Claude 4 series
Coding Performance: Matches Claude Sonnet 4 with 90% effectiveness in agentic coding tasks
Speed: Up to 2x faster than Sonnet 4
Context Window: Supports very long contexts (e.g., up to 200,000 tokens reported)
Output Token Limit: Large max output tokens, for extended generation capabilities
Performance Benchmarks
SWE-bench Verified: 73.3% score, close to Sonnet 4.5's 77.2%, positioning it as one of the best coding AI models worldwide
Agentic Coding: Supports multi-agent orchestration with high responsiveness
Instruction Following: Achieves 65% accuracy on slide text generation, outperforming premium-tier models
Speed and Responsiveness: Runs 4-5x faster than Sonnet 4.5, enabling seamless real-time AI-assisted development
Safety & Alignment: Classified as AI Safety Level 2 with statistically significantly lower misalignment rates compared to Sonnet 4.5 and Opus 4.1
Benchmarks
Key Features
High-speed, cost-efficient coding support: Ideal for prototyping, multi-agent coding environments, and pair programming
Parallel task management: Works in tandem with larger Claude models (e.g., Sonnet 4.5) for complex multi-step workflows, delegating subtasks efficiently
Enhanced real-time interactivity: Perfect for chatbots, customer service AI, and agentic systems requiring instant responses
Advanced reasoning support: Capable of deep problem-solving combined with rapid output generation
API Pricing
Base Input Tokens: $1.05
Output Tokens: $5.25
Use Cases
Real-time chat assistants and conversational AI services
Customer support automation with low latency response
AI pair programming and code generation
Agent orchestration for complex workflows involving multiple AI instances
Rapid prototyping of software with interactive AI support
Code Sample
Comparison with Other Models
vs Claude 4.5 Sonnet: Haiku 4.5 offers nearly the same coding performance at about one-third of the cost and twice the speed. Sonnet 4.5 remains the frontier model with slightly higher accuracy but higher cost and latency.
vs Claude 3.5 Haiku: Haiku 4.5 brings substantial speed and cost improvements while matching or surpassing performance benchmarks of Haiku 3.5. Introduces AI Safety Level 2 classification with better alignment and fewer risks.
vs Opus 4.1: Haiku 4.5 is faster, cheaper, and safer with statistically lower misalignment behaviors. Outperforms Opus 4.1 in coding tasks and agentic workflow support.
vs GPT-5: Haiku 4.5 is ideal for developers prioritizing speed, cost, and reliability in coding and interactive AI, whereas GPT-5 suits scenarios demanding advanced reasoning and multimodal capabilities with flexible configuration.
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