GPT-5.3 ChatvsMercury
GPT-5.3 Chat is cheaper than Mercury at $1.75/M vs $10/M input tokens.
| Spec | GPT-5.3 Chat | Mercury |
|---|---|---|
| Input price | $1.75/M tokens | $10/M tokens |
| Output price | $14/M tokens | $10/M tokens |
| Context window | 128K tokens | 32K tokens |
| Free API (OpenRouter) | No | No |
| Released | Mar 2026 | Jun 2025 |
Our Verdict
GPT-5.3 Chat
MercuryRunner-up
Not enough votes to call it. On the specs, GPT-5.3 Chat has the edge: bigger model tier, newer, bigger context window, major provider backing.
Slight edge
API pricing
Cost per 1M tokens
GPT-5.3 Chat
Input
$1.75
5.7× cheaper
Output
$14.00
Mercury
Input
$10.00
Output
$10.00
1.4× cheaper
GPT-5.3 Chat wins input (5.7× cheaper)·Mercury wins output (1.4× cheaper)
Writing DNA
Style Comparison
Similarity
74%
Mercury uses 2.8x more emoji
GPT-5.3 Chat
Mercury
59%Vocabulary60%
26wSentence Length31w
0.84Hedging0.78
1.7Bold4.1
6.6Lists2.8
0.00Emoji0.03
0.00Headings0.88
0.25Transitions0.06
Based on 23 + 26 text responses
Research
What we learned reading every model
FAQ
Common questions
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