Earlier Opus-tier model in the Claude 4 line, now legacy. Carries a 1M-token context window, extended thinking, and full vision/tool support at the standard Opus price of $5/$25 per million tokens.
profile normalized against the 47-model field
Context window· 1M of 1.05M95%
Max output· 64K of 272K24%
Output speed—
Affordability· $25.00 / Mtok out86%
Capability breadth· 4 of 1136%
Capability switches · 4 of 11
Reasoning mode
Tool / function use
Streaming
JSON mode
Structured outputs
Prompt caching
Fine-tuning
Web search
Code execution
Vision input
Audio input
Specifications
Every value carries a primary source and a verification date.
Capacity
Context window
1M
Max output
64K
Pricing
Input $/Mtok
$5.00 / Mtok input USD/Mtok
Cached input $/Mtok
0.5 USD/Mtok
Output $/Mtok
$25.00 / Mtok output USD/Mtok
Capabilities
Input modalities
Text, image
Output modalities
Text
Reasoning mode
Extended thinking: Yes
Tool / function use
Yes
Prompt caching
Yes
Vision input
Yes
API
API model ID
claude-opus-4-5
Batch API
Yes
General
Knowledge cutoff
May 2025
Release date
December 15, 2025
Benchmarks
Sourced evaluation scores, each verified against its primary source.
GPQA Diamond
Claude Opus 4.5 reaches GPQA Diamond: 83.1%.
83.1 %Verified
SWE-bench Verified
On SWE-bench Verified, Claude Opus 4.5 scores 76.4%.
76.4 %Verified
Humanity's Last Exam (no tools)
Humanity's Last Exam (no tools): 15.9% for Claude Opus 4.5.