ChatGPT-4o (March 2025)vsOpenRouter Fusion · Budget (Jun 2026)
OpenRouter Fusion · Budget (Jun 2026) has a larger context window than ChatGPT-4o (March 2025) (256K tokens vs 128K tokens).
| Spec | ChatGPT-4o (March 2025) | OpenRouter Fusion · Budget (Jun 2026) |
|---|---|---|
| Input price | $5/M tokens | — |
| Output price | $15/M tokens | — |
| Context window | 128K tokens | 256K tokens |
| Released | Mar 2025 | Jun 2026 |
Our Verdict
ChatGPT-4o (March 2025)
OpenRouter Fusion · Budget (Jun 2026)
Not enough votes to call it. On the specs, nothing separates them.
Too close to call
API pricing
Cost per 1M tokens
ChatGPT-4o (March 2025)
Input
$5.00
Output
$15.00
OpenRouter Fusion · Budget (Jun 2026)
Input
—
Output
—
Writing DNA
Style Comparison
Similarity
44%
ChatGPT-4o (March 2025) uses 94.5x more emoji
ChatGPT-4o (March 2025)
OpenRouter Fusion · Budget (Jun 2026)
55%Vocabulary58%
24wSentence Length22w
0.52Hedging0.13
3.3Bold3.8
6.0Lists1.7
0.94Emoji0.01
0.63Headings0.93
0.05Transitions0.17
Based on 15 + 27 text responses
Research
What we learned reading every model
FAQ
Common questions
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