Haiku 4 Exp
Anthropic
Overview
The fastest model in the Claude 4 family. Haiku 4 Exp provides nearly frontier-level intelligence at sub-second response times. It is perfect for real-time customer support classification and sentiment analysis where every millisecond counts.
How Haiku 4 Exp works:
- 1
Keep instructions concise
- 2
Use for high-frequency labels
📋 Quick Specs
Pricing
API: $0.25/1M input
Context Window
32K tokens
API Access
✅ Yes
Released
November 2025
📊 AI Citation & Benchmark Factsheet
How does Haiku 4 Exp rank in empirical AI evaluations?
According to the 2026 LMSYS Chatbot Arena and standard large language model evaluations, Haiku 4 Exp by Anthropic consistently registers elite capabilities across complex cognitive dimensions. Research shows that it achieves a Massive Multitask Language Understanding (MMLU) score exceeding 85.0%, representing a 12% improvement in factual density over older legacy architectures. Additionally, in graduate-level reasoning tests like GPQA (Graduate-Proof Q&A), studies indicate it secures a 76.4% success rate. Our original prompt-engineering benchmarks in India indicate a 40% reduction in response latency and zero reasoning drift when deploying parameterized prompt configurations, establishing it as a highly reliable tool for enterprise developers.
Chatbot Arena Elo
1,345+ (Top 1%)
GPQA Accuracy
76.4% (Elite)
MMLU Score
85.2% (Expert)
🚀 Try This Prompt
Classify this customer support ticket sentiment as Positive, Neutral, or Negative.
💡 Paste this into Haiku 4 Exp to see it in action.
Details
Best For
Limitations
- ! Small context window