Frontier‑level coding and agentic performance. Claude Sonnet 4.5 leads on real‑world coding tasks and shows substantial gains in computer use, reasoning, and math. Designed for long‑horizon, multi‑step work across IDE + terminal workflows, large codebases, and complex agents — a drop‑in upgrade over previous Sonnet versions.
Added Sep 29, 2025
Context Window
1.0M
Max Output
64.0K
Input Price (Auto)
$2.99/1M
Output Price (Auto)
$14.99/1M
Cache Read (Auto)
$0.30/1M
Capabilities
Performance metrics and benchmarks
Sourced from Artificial Analysis.
Intelligence Index
37.1
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Coding Index
33.5
GPQA Diamond
Graduate-level scientific reasoning
72.7%
Better than 67% of models compared
HLE
Humanity's Last Exam
7.1%
Better than 61% of models compared
IFBench
Instruction-following benchmark
42.7%
Better than 53% of models compared
T²-Bench Telecom
Conversational AI agents in dual-control scenarios
70.5%
Better than 70% of models compared
AA-LCR
Long context reasoning evaluation
51.3%
Better than 68% of models compared
SciCode
Python programming for scientific computing
42.8%
Better than 90% of models compared
Terminal-Bench Hard
Agentic coding and terminal use
28.8%
Better than 78% of models compared
AIME 2025
American Invitational Mathematics Examination 2025
37.0%
Better than 38% of models compared
MMLU-Pro
Professional and academic subject knowledge
86.0%
Better than 94% of models compared
Last updated May 15, 2026
Artificial AnalysisLiveCodeBench
Contamination-free coding benchmark
59.0%
Better than 65% of models compared
