Large Language ModelText Generation

Claude Sonnet 4.5

Claude 4.5 Sonnet with breakthrough coding performance

Released 2025-09-29

Context Window

200K

API Access

Available

Benchmark Performance

reasoning

reasoning

Massive Multitask Language Understanding

88.9%

reasoning

Graduate-Level Google-Proof Q&A

68.9%

coding

coding

HumanEval

92.5%

conversation

conversation

Chatbot Arena Elo

1445.0Elo