Claude Sonnet 3.6 (2022-10-22)vsClaude Sonnet 4.5
Claude Sonnet 4.5 is the newer model, released after Claude Sonnet 3.6 (2022-10-22).
| Spec | Claude Sonnet 3.6 (2022-10-22) | Claude Sonnet 4.5 |
|---|---|---|
| Input price | $3/M tokens | $3/M tokens |
| Output price | $15/M tokens | $15/M tokens |
| Context window | 200K tokens | 200K tokens |
| Released | Jun 2024 | Sep 2025 |
| SWE-bench Verified | 49.0% | 77.2% |
Our Verdict
Claude Sonnet 3.6 (2022-10-22)
Claude Sonnet 4.5
Not enough votes to call it. On the specs, nothing separates them.
Too close to call
API pricing
Cost per 1M tokens
Claude Sonnet 3.6 (2022-10-22)
Input
$3.00
Output
$15.00
Claude Sonnet 4.5
Input
$3.00
Output
$15.00
Writing DNA
Style Comparison
Similarity
87%
Claude Sonnet 4.5 uses 45.2x more emoji
Claude Sonnet 3.6 (2022-10-22)
Claude Sonnet 4.5
67%Vocabulary64%
64wSentence Length94w
0.70Hedging0.48
0.3Bold4.9
8.1Lists8.0
0.00Emoji0.45
0.05Headings1.91
0.07Transitions0.07
Based on 26 + 20 text responses
Research
What we learned reading every model
FAQ
Common questions
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