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Claude Sonnet 4.5

anthropic/claude-sonnet-4.5 is an AI model.

Open
Publisher
Anthropic
Family
Claude
Params
Undisclosed (closed)
Context
1M
Input
Output
Providers
anthropicaws-bedrockvertex-ai
License
proprietary
Released
29 Sep 2025
Canonical
anthropic.com/news/claude-sonnet-4-5

Cite

Notes

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Attribution

Attribution policy →
Context
1M
Weights
Closed
API only
Input
$3
/1M tok
Output
$15
/1M tok
Blended
$6
#467/ 500/1M · 3:1
Speed
0
#106/ 499tok/s
Cache read
$0.30
0.10x input
Cache write
$3.75
1.25x input

Price & speed via Artificial Analysis · ranked across tracked models · caching via OpenRouter

Reasoning effortIndexSpeed
Reasoning20.70 t/s
Non-reasoning19.30 t/s

Intelligence Index per reasoning-effort setting, via Artificial Analysis · pricing identical across tiers

Reported on 82 evals across 15 domains - best 88.0% on AIME 2025: Problems from the American Invitational Mathematics Examination · #34 of 205

Reported eval scores

82
AIME2025100
Spiral Bench0
NanochatAquaRat0
Infraresolutionbench83.8
Pii Masking0
Mastermind0.7
Mastermind0.7
MulSeT0
Taxcalc Bench0
Terminal Bench 2 Verified50.3
Traveling Salesman0
Extract Zero0
Mbti0
Taxcalc Bench0
Lights Out0
Gridgame0
Gridsize0
Count Intersections0
Vpct 10
Count Lines0

Head-to-heads

29

benchmark comparisons against other models

vs GPT-4.1 Mini35 shared evalsvs Claude Opus 4.534 shared evalsvs GPT-5.232 shared evalsvs GPT-5 Mini31 shared evalsvs GPT-531 shared evalsvs GPT-5 Nano31 shared evalsvs Claude 4 Sonnet28 shared evalsvs Claude Opus 4.628 shared evalsvs Kimi K2.528 shared evalsvs Grok 4.1 Fast28 shared evalsvs Gemini 3.1 Pro Preview27 shared evalsvs DeepSeek V3.227 shared evalsvs GPT-5.526 shared evalsvs GPT-5.426 shared evalsvs Gemini 2.5 Pro26 shared evalsvs Claude Opus 4.825 shared evalsvs GLM 4.725 shared evalsvs Claude Fable 524 shared evalsvs Claude Opus 4.724 shared evalsvs Claude Sonnet 4.624 shared evalsvs GLM 5.123 shared evalsvs gpt-oss-120b23 shared evalsvs GPT-5.4 Mini23 shared evalsvs Qwen3.6 Plus22 shared evalsvs GPT-4o21 shared evalsvs GPT-4.119 shared evalsvs GPT-4o-mini17 shared evalsvs GPT-4.1 Nano16 shared evalsvs GPT-6 Astra11 shared evals