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Claude Sonnet 4.5

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Claude Sonnet 4.5 is an AI model from Anthropic. Claude Sonnet 4.5 with extended thinking mode enabled for enhanced step-by-step reasoning on complex tasks.
Specifications
Canonical IDanthropic-claude-4-5-sonnet-thinking
StatusActive
CreatorAnthropicAnthropic
Benchmarks
Intelligence Index
#35
Coding Index
#65
Math Index
#50
MMLU-Pro
#10
GPQA
#125
HLE
#147
LiveCodeBench
#72
IFBench
#133
Time to First Token
#71
SciCode
#93
AIME 2025
#50
LCR
#149
TerminalBench Hard
#61
TAU2
#128
Output TPS
#302

Capabilities

Input0/5
Text·
Image·
Audio·
Video·
PDF·
Output0/5
Text·
Image·
Audio·
Video·
Embedding·
Capabilities0/13
Reasoning·
Adaptive Reasoning·
Function Calling·
Parallel Function Calling·
Structured Outputs·
Native JSON Schema·
Web Search·
URL Context·
Computer Use·
Code Execution·
File Search·
Prompt Caching·
Assistant Prefill·

Versions

VersionReleasedContextInput / 1MOutput / 1MStatus
Claude Sonnet 51.0M$2.00$0.200Deprecating
Claude Sonnet 4.61.0M$3.00$0.300Deprecating
Claude Sonnet 4.51.0M$3.00$0.300Deprecating
Claude Sonnet 41.0M$3.00$0.300Deprecated
Claude Sonnet 4.5————Current
Claude Sonnet 4.6 Adaptive————Available
Claude Sonnet 4.6 Non-Reasoning Low Effort————Available
Claude Sonnet 4————Available
Claude Sonnet 4.1—200K$3.00$15.00Available
Claude Sonnet 3.7200K——Available
Claude Sonnet 3.7200K$3.00$15.00Deprecated

Other Models

ModelTierReleasedContextInput / 1MOutput / 1M
Claude Opus 5.5Opus1.0M$4.00$0.200
Claude Fable 5.1—1.0M$10.00$0.250
Claude Opus 5Opus1.0M$5.00$0.500
Claude Fable 5Fable1.0M$10.00$1.00
Claude Fable 5.3Fable————
Claude Mythos 5Mythos—1.0M$10.00$1.00
Claude Mythos 5.1Mythos—1.0M$10.00$0.250
Claude Opus 4.8Opus1.0M$5.00$0.500
Claude Opus 4.7Opus1.0M$5.00$0.500
Claude Opus 4.6Opus1.0M$5.00$0.500

Model IDs

anthropic-claude-4-5-sonnet-thinking
claude-4-5-sonnet-thinking