OpenRouter
Claude Opus 5 (Fast)
Flagship Claude model for deep reasoning, coding, and long-horizon agents
anthropic/claude-opus-5-fastContext
1M
Max output
128K
Input $/M
$10.00
Output $/M
$50.00
Cache read $/M
$1.00
Cache write $/M
$12.50
Against the catalogue
Context window1M
Larger than 88% of the 5,751 models listed
Input price$10.00
Cheaper than 3% of priced models
Capabilities
Reasoningsupported
Tool callingsupported
Structured outputsupported
Attachmentssupported
Temperaturenot supported
Open weightsnot supported
Interleaved thinkingnot supported
Modalities
Input
TextImagePDF
Output
Text
Reasoning controls
effortlow, medium, high, xhigh, maxPricing detail
| Rate | Base $/M |
|---|---|
| Input | $10.00 |
| Output | $50.00 |
| Cache read | $1.00 |
| Cache write | $12.50 |