Claude Sonnet 4.5
Claude Sonnet 4.5 is the best coding model in the world. It's the strongest model for building complex agents. It’s the best model at using computers. And it shows substantial gains in reasoning and m
Claude Sonnet 4.5 is the best coding model in the world. It's the strongest model for building complex agents. It’s the best model at using computers. And it shows substantial gains in reasoning and math. Highest intelligence across most tasks with exceptional agent and coding capabilities.
LLMs
Free tier
Intelligence
Popularity49/100
Monthly visits—
Growth—
Updated2026-05-21
Features
GPQA
MMLU
MMLU-Pro
AIME 2025
MATH
HumanEval
Pros
Cons
Use cases
API inference · Fine-tuning · Benchmarking
AI models used
Claude Sonnet 4.5
FAQ
How much does Claude Sonnet 4.5 cost?
Free tier
Does Claude Sonnet 4.5 have a free plan?
Limited or no free tier
Is there an API?
Yes