GPT-5 Nano vs Gemini 2.5 Flash Lite: cost compared
Across 6 common app types, GPT-5 Nano is on average 1.3× cheaper. GPT-5 Nano is cheaper in 6 of 6 scenarios. Quality index: GPT-5 Nano 13 vs Gemini 2.5 Flash Lite 10.4.
| Price (per 1M tokens) | GPT-5 Nano | Gemini 2.5 Flash Lite |
|---|---|---|
| Input | $0.05 | $0.1 |
| Output | $0.4 | $0.4 |
| Cached input | $0.005 | $0.01 |
| Context window | 400,000 | 1,048,576 |
| Batch pricing | yes | yes |
Monthly cost by app type
| App | GPT-5 Nano | Gemini 2.5 Flash Lite | |
|---|---|---|---|
| AI chatbot | $76.28 | $86.55 | tweak → |
| RAG app | $50.58 | $76.56 | tweak → |
| Discord bot | $79.34 | $98.37 | tweak → |
| image / vision app | $8.60 | $11.64 | tweak → |
| document summarizer | $14.88 | $23.22 | tweak → |
| AI writing tool | $58.69 | $64.40 | tweak → |
Prices only tell half the story. If GPT-5 Nano is good enough for most of your traffic, route easy requests there and save the other model for the hard ones; the calculator's "cheapest smart mix" estimates that split.
Compare them in the calculator →
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Prices: OpenRouter list prices (USD per 1M tokens), updated 2026-10-15. Estimates only; a month is 30 days. See how the math works.