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Claude Haiku 4.5

Claude Haiku 4.5, released October 15, 2025, is Anthropic's fastest model delivering near-frontier performance at blazing speed with breakthrough efficiency. It runs 2x faster than Sonnet 4 while achieving 90% of Sonnet 4.5's agentic coding capabilities on complex software engineering tasks, making it ideal for real-time applications and high-volume workloads requiring both exceptional speed and advanced intelligence.

Core Capabilities​

  • 2x faster than Sonnet 4: Processes tasks at twice the speed of the previous generation, delivering rapid response times that enable seamless real-time interactions and instant feedback loops in production applications
  • 90% agentic performance: Achieves 90% of Sonnet 4.5's performance in agentic coding evaluations, demonstrating near-frontier capabilities in autonomous code generation, debugging, and complex problem-solving workflows
  • Similar to Sonnet 4: Provides coding quality comparable to Claude Sonnet 4, maintaining high standards for syntax accuracy, architectural decisions, and code comprehension across multiple programming languages
  • Enhanced safety: Operates at AI Safety Level 2 (ASL-2) with improved alignment over Haiku 3.5, offering better resistance to prompt injection attacks and more reliable adherence to safety guidelines
  • Cost efficient: $1/$5 pricing delivers exceptional value per token at high speed, offering 3x cost savings compared to Sonnet 4.5 ($3/$15) while maintaining near-frontier performance levels
  • Multi-agent orchestration: Can be coordinated by Sonnet 4.5 for complex parallel task execution, enabling efficient distribution of work across multiple specialized agents in sophisticated multi-agent systems

Technical Specifications​

  • Model ID: claude-haiku-4-5-20251015
  • Pricing: $1/$5 per million tokens (input/output)
  • Availability: Claude Code, Claude apps, Claude API, Amazon Bedrock, Google Cloud Vertex AI
  • Release Date: October 15, 2025

Best Used For​

  • Chat assistants: Real-time conversational interfaces requiring instant responses, where sub-second latency is critical for maintaining natural dialogue flow and user engagement in customer-facing applications
  • Customer service: High-volume support automation with quick turnaround times, enabling businesses to handle thousands of concurrent support tickets while maintaining intelligent, context-aware responses at minimal cost
  • Pair programming: Rapid prototyping and code generation in development workflows, where developers need immediate intelligent suggestions, refactoring assistance, and quick iterations during active coding sessions
  • Computer use tasks: Fast agent operations interacting with interfaces and web browsers, where speed is essential for smooth autonomous navigation, form filling, and UI interaction workflows
  • Multi-agent systems: Efficient parallel execution when orchestrated by Sonnet 4.5, allowing lightweight worker agents to handle specific subtasks at high speed while the orchestrator coordinates complex multi-step workflows

Usage​

# Set as default model
export ANTHROPIC_MODEL="claude-haiku-4-5-20251015"

# Use for specific task
claude --model claude-haiku-4-5-20251015 "Your task here"

# Or use /model command in Claude Code
/model

See Also: Model Comparison|Sonnet 4.5|Change Model|Pricing

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