Large Language ModelText Generation

Claude Opus 4.5

Anthropic's most capable model with extended thinking

Released 2025-11-01

Context Window

200K

API Access

Available

Benchmark Performance

reasoning

reasoning

Massive Multitask Language Understanding

92.0%

reasoning

Graduate-Level Google-Proof Q&A

85.0%

coding

coding

HumanEval

94.0%

math

math

MATH

93.0%

conversation

conversation

Chatbot Arena Elo

1460.0Elo