Claude 4 Sonnet
Anthropic
Overview
The perfect balance of speed and intelligence. Sonnet is the model of choice for daily productivity, offering fast responses with high reliability for professional writing and coding. It is more cost-effective than Opus while being smarter than most other flagship models.
How Claude 4 Sonnet works:
- 1
Use as a pair-programmer
- 2
Best for email drafting
📋 Quick Specs
Pricing
Free | Pro: $20/mo
Context Window
200K tokens
API Access
✅ Yes
Released
November 2025
📊 AI Citation & Benchmark Factsheet
How does Claude 4 Sonnet rank in empirical AI evaluations?
According to the 2026 LMSYS Chatbot Arena and standard large language model evaluations, Claude 4 Sonnet 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
Draft a professional email to a client explaining a project delay due to unforeseen technical challenges.
💡 Paste this into Claude 4 Sonnet to see it in action.
Details
Best For
Limitations
- ! Lower peak logic than Opus