Gemini 2.5 Flash Preview 05-20 (thinking)vsGPT-5.3-Codex
Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper than GPT-5.3-Codex at $0.15/M vs $1.75/M input tokens.
| Spec | Gemini 2.5 Flash Preview 05-20 (thinking) | GPT-5.3-Codex |
|---|---|---|
| Input price | $0.15/M tokens | $1.75/M tokens |
| Output price | $3.5/M tokens | $14/M tokens |
| Context window | 1.0M tokens | 400K tokens |
| Released | May 2025 | Feb 2026 |
Our Verdict
GPT-5.3-Codex
Gemini 2.5 Flash Preview 05-20 (thinking)Runner-up
Not enough votes to call it. On the specs, GPT-5.3-Codex has the edge: bigger model tier, newer.
Gemini 2.5 Flash Preview 05-20 (thinking) costs 4.0x less per token.
Too close to call
API pricing
Cost per 1M tokens
Gemini 2.5 Flash Preview 05-20 (thinking)
Input
$0.15
12× cheaper
Output
$3.50
4.0× cheaper
GPT-5.3-Codex
Input
$1.75
Output
$14.00
Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper on both — 12× input, 4.0× output
Writing DNA
Style Comparison
Similarity
42%
GPT-5.3-Codex uses 51.2x more hedging
Gemini 2.5 Flash Preview 05-20 (thinking)
GPT-5.3-Codex
70%Vocabulary65%
11wSentence Length23w
0.00Hedging0.51
4.2Bold6.5
7.3Lists6.2
0.00Emoji0.16
0.00Headings1.90
0.00Transitions0.03
Based on 3 + 23 text responses
Research
What we learned reading every model
FAQ
Common questions
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