GPT-3.5 TurbovsGPT-5.5
GPT-3.5 Turbo is cheaper than GPT-5.5 at $1.5/M vs $5/M input tokens.
| Spec | GPT-3.5 Turbo | GPT-5.5 |
|---|---|---|
| Input price | $1.5/M tokens | $5/M tokens |
| Output price | $2/M tokens | $30/M tokens |
| Context window | 16K tokens | 1.1M tokens |
| Weights | Closed | Closed |
| Free API (OpenRouter) | No | No |
| Released | Mar 2022 | Apr 2026 |
Our Verdict
GPT-5.5
GPT-3.5 TurboRunner-up
Not enough votes to call it. On the specs, GPT-5.5 has the edge: bigger model tier, newer, bigger context window.
GPT-3.5 Turbo costs 15x less per token.
Slight edge
Reviewing agent-written code?See a Brief PR report
API pricing
Cost per 1M tokens
GPT-3.5 Turbo
Input
$1.50
3.3× cheaper
Output
$2.00
15× cheaper
GPT-5.5
Input
$5.00
Output
$30.00
GPT-3.5 Turbo is cheaper on both: 3.3× input, 15× output.
Where to run it
4 hosts, cheapest first
GPT-3.5 Turbo1 host
Per million tokens. Prices and uptime via OpenRouter, checked 11 Sep 2026.
Writing DNA
Style Comparison
Similarity
50%
GPT-5.5 uses 167.8x more headings
GPT-3.5 Turbo
GPT-5.5
60%Vocabulary58%
30wSentence Length18w
0.49Hedging0.74
0.3Bold2.9
3.1Lists5.1
0.00Emoji0.00
0.00Headings1.68
0.20Transitions0.03
Based on 28 + 26 text responses
Research
What we learned reading every model
FAQ
Common questions
Keep exploring
More comparisons
GPT-3.5 Turbo vs Ox AlphaNew provider
GPT-3.5 Turbo vs Claude Opus 4New provider
GPT-3.5 Turbo vs Claude Opus 4.1New provider
GPT-3.5 Turbo vs Gemini 2.5 Pro Preview 06-05New provider
GPT-3.5 Turbo vs Horizon BetaNew provider
GPT-3.5 Turbo vs Hunter AlphaNew provider
GPT-3.5 Turbo vs Hy4 PreviewNew provider
GPT-3.5 Turbo vs InklingNew provider