Gemini 3.8 Flash vs GPT-5.6 Luna
Sample workload: short support reply (~512 output tokens). Open the calculator for your own prompt.
| Field | Gemini 3.8 Flash | GPT-5.6 Luna |
|---|---|---|
| Provider | OpenAI | |
| Accuracy | Approx | Exact |
| Input / 1M | $0.750/1M | $0.200/1M |
| Output / 1M | $3.75/1M | $1.20/1M |
| Sample input tokens | 25 | 16 |
| Sample request cost | $0.001939 | $0.000618 |
| Pages | Model page | Model page |
Try your own prompt
Sample costs above use a fixed support-chat prompt. For your text, open the main calculator with either model preselected.
Gemini 3.8 Flash in calculator · GPT-5.6 Luna in calculator · Count tokens (Gemini 3.8 Flash) · Count tokens (GPT-5.6 Luna) · All comparisons
How LLM pricing works · Exact vs Approx · Gemini 3.8 Flash page · GPT-5.6 Luna page
Related comparisons
Other featured pairs that share Gemini 3.8 Flash or GPT-5.6 Luna.
Related tools
LLM cost calculator · Cheapest LLM API · Cache savings · Batch pricing
Related guides
How LLM API pricing works · How prompt cost is calculated · Prompt caching explained · Exact vs Approx
Sources and references
Official documentation used for definitions, counting methods, or rate cards. Always confirm critical budgets on the provider page.