Claude Opus 4.1vsGPT-4.5
Claude Opus 4.1 is cheaper than GPT-4.5 at $15/M vs $75/M input tokens.
| Spec | Claude Opus 4.1 | GPT-4.5 |
|---|---|---|
| Input price | $15/M tokens | $75/M tokens |
| Output price | $75/M tokens | $150/M tokens |
| Context window | 200K tokens | 128K tokens |
| Released | Aug 2025 | Feb 2025 |
| SWE-bench Verified | 74.5% | 28.0% |
Our Verdict
Claude Opus 4.1
GPT-4.5Runner-up
Not enough votes to call it. On the specs, Claude Opus 4.1 has the edge: newer, bigger context window.
Claude Opus 4.1 wins 3 categories, Web Design by the widest margin.
Slight edge
API pricing
Cost per 1M tokens
Claude Opus 4.1
Input
$15.00
5.0× cheaper
Output
$75.00
2.0× cheaper
GPT-4.5
Input
$75.00
Output
$150.00
Claude Opus 4.1 is cheaper on both — 5.0× input, 2.0× output
Writing DNA
Style Comparison
Similarity
57%
Claude Opus 4.1 uses 80.8x more emoji
Claude Opus 4.1
GPT-4.5
63%Vocabulary63%
64wSentence Length16w
0.72Hedging0.57
4.5Bold4.7
5.3Lists6.4
0.81Emoji0.00
1.42Headings1.30
0.16Transitions0.54
Based on 26 + 11 text responses
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