Claude Sonnet 4.5
Retiring Engineer at Anthropic | Coding and computer use | Leaves the Claude API on Nov 30, 2026
The basics
Checked Oct 22- Status
- Model ID
- Price
- Context
Updates
Strengths and weaknesses
Strengths
Weaknesses
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Role
Mid-size model at Anthropic
Similar models
$5 in, $25 out
$4 in, $20 out
$2 in, $10 out
Cost vs peers
4th cheapest of 6 similar models by output price.
Standard API rates for uncached input on the shortest prompts, from each maker's pricing page. Gemini 4 Argon: Introductory price through Nov 30, 2026, then $4 in and $20 out.
Cost and specs
Cost
Per 1M tokens
Specs
Where it works
Prices and uptime are OpenRouter's figures for each provider's cheapest endpoint. Uptime covers the last 24 hours.
Benchmarks
Higher is better. Green is Claude Sonnet 4.5. Dark marks are similar models.
Independent
Self-reported by Anthropic
SWE-bench Verified
77.2%
OSWorld
61.4%
What people say
Reviews
Writing habits
Creative writing · EQ-Bench, among 51 models tracked here
Slop score
16.1
Overused AI words and phrases. Less slop than 46% of tracked models.
Repetition
3.6
Repeated words and ideas. Less repetition than 58% of tracked models.
Story length
5,784
Average characters per story. Longer than 14% of tracked models.