Claude Opus 4.8vsGPT-1
Claude Opus 4.8 has a larger context window than GPT-1 (1.0M tokens vs 1K tokens).
| Spec | Claude Opus 4.8 | GPT-1 |
|---|---|---|
| Input price | $5/M tokens | — |
| Output price | $25/M tokens | — |
| Context window | 1.0M tokens | 1K tokens |
| Weights | Closed | Open |
| Free API (OpenRouter) | No | — |
| Released | May 2026 | Jun 2018 |
Our Verdict
Claude Opus 4.8
GPT-1Runner-up
Not enough votes to call it. On the specs, Claude Opus 4.8 has the edge: bigger model tier, newer, bigger context window.
Slight edge
API pricing
Cost per 1M tokens
Claude Opus 4.8
Input
$5.00
Output
$25.00
GPT-1
Input
—
Output
—
Where to run it
4 hosts
GPT-1
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
45%
Claude Opus 4.8 uses 470.8x more bold
Claude Opus 4.8
GPT-1
60%Vocabulary65%
19wSentence Length14w
0.46Hedging0.27
4.7Bold0.0
3.2Lists0.3
0.78Emoji0.00
1.15Headings0.00
0.04Transitions0.41
Based on 27 + 7 text responses
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