Claude 3 OpusvsGPT-4.5
Claude 3 Opus is cheaper than GPT-4.5 at $15/M vs $75/M input tokens.
| Spec | Claude 3 Opus | 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 |
| Parameters | Not disclosed | Not disclosed |
| Free API (OpenRouter) | No | No |
| Released | Mar 2024 | Feb 2025 |
| MMLU | 86.8% | 90.8% |
Our Verdict
Claude 3 Opus
GPT-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 3 Opus
Input
$15.00
5.0× cheaper
Output
$75.00
2.0× cheaper
GPT-4.5
Input
$75.00
Output
$150.00
Claude 3 Opus is cheaper on both: 5.0× input, 2.0× output.
Writing DNA
Style Comparison
Similarity
30%
GPT-4.5 uses 466.6x more bold
Claude 3 Opus
GPT-4.5
54%Vocabulary63%
14wSentence Length16w
0.48Hedging0.57
0.0Bold4.7
3.0Lists6.4
0.00Emoji0.00
0.00Headings1.30
0.06Transitions0.54
Based on 3 + 11 text responses
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