GPT 5.5 vs Gemini Flash Lite pricing
Side-by-side token pricing for GPT 5.5 (OpenAI) and Gemini Flash Lite (Google Gemini), plus the total cost at three workload sizes so the crossover point is obvious. Prices refreshed 2026-09-23 00:10 UTC.
| Metric | GPT 5.5 | Gemini Flash Lite |
|---|---|---|
| Input $/1M tokens | $5 | $0.3 |
| Output $/1M tokens | $30 | $2.5 |
| Cached input $/1M | $0.5 | $0.03 |
| Context window | 1.1M | 1.0M |
| Max output | 128K | 66K |
| Vision | yes | yes |
| Tool calling | yes | yes |
| Cache pricing | yes | yes |
Total cost by workload
| Workload | GPT 5.5 | Gemini Flash Lite | Cheaper |
|---|---|---|---|
| 1M tokens in · 300K out | $14 | $1.05 | Gemini Flash Lite (93% less) |
| 10M tokens in · 3M out | $140 | $10.5 | Gemini Flash Lite (93% less) |
| 100M tokens in · 30M out | $1400 | $105 | Gemini Flash Lite (93% less) |
On blended cost (weighted 3:1 toward input), Gemini Flash Lite comes out cheaper by roughly 94% on input pricing. Pick Gemini Flash Lite when the workload is price-sensitive and its context window covers your prompts; GPT 5.5 is the one to benchmark if you need vision, reasoning depth, or a different quality profile.
Frequently asked
› Is GPT 5.5 cheaper than Gemini Flash Lite?
On input pricing, Gemini Flash Lite is cheaper ($0.3 vs $5 per 1M tokens). On blended cost the winner is Gemini Flash Lite, because output tokens are weighted differently for most workloads.
› Which has the larger context window?
GPT 5.5 offers the larger context (1.1M tokens).
› Do these prices include prompt caching?
Cached input is priced separately where a provider publishes a cache rate; the table above lists it per model so the comparison stays like-for-like.