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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