Gemini 2.5 Flash vs GPT-5 mini
Gemini 2.5 Flash wins on raw price; GPT-5 mini wins on ecosystem and structured output.
Gemini 2.5 Flash is $0.075/M input — 3× cheaper than GPT-5 mini at $0.25/M. It also has 1M context vs 128K for GPT-5 mini. The trade-off: Google's ecosystem is less mature for enterprise integrations, and OpenAI's structured output mode has no equivalent in Gemini's API.
Side-by-side pricing
| Gemini 2.5 Flash | GPT-5 mini | |
|---|---|---|
| Provider | OpenAI | |
| Input price/1M | $0.30 | $0.25 |
| Output price/1M | $2.50 | $2.00 |
| Cache read/1M | $0.075 | $0.025 |
| Context window | 1M | 400K |
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Prompt caching | ✓ | ✓ |
| Speed tier | Fast | Fast |
Prices verified 2026-08-20. See changelog for history.
Winner by task
Calculate costs for each model
Frequently Asked Questions
Should I use Gemini Flash or GPT-5 mini?
If cost and context window are your primary concerns: Gemini 2.5 Flash. If you need strict structured output, OpenAI ecosystem compatibility, or already have OpenAI integrations: GPT-5 mini. At very high volume (10M+ tokens/month), the 3× price difference adds up to significant savings.
Prices verified 2026-08-20. See methodology for calculation details.