Comparison
Gemini 3.5 Flash vs GPT-5.5
GPT-5.5 charges 70% more per input token than Gemini 3.5 Flash. Output pricing favors Gemini 3.5 Flash, 70% less per token than GPT-5.5. GPT-5.5 has the larger context window than Gemini 3.5 Flash.
| Field | Gemini 3.5 Flash | GPT-5.5 |
|---|---|---|
| Provider | OpenAI | |
| Context window | 1M | 1.1M |
| Max output | 65.5K | 128K |
| Input / 1M | $1.5070% cheaper | $5.00 |
| Output / 1M | $9.0070% cheaper | $30.00 |
| Cached input / 1M | $0.1570% cheaper | $0.50 |
| Batch discount | 50% | 50% |
| Release date | — | 2026-04-23 |
Worked cost examples
Estimated monthly cost on three common usage shapes
| Workload | Gemini 3.5 Flash | GPT-5.5 |
|---|---|---|
Chatbot 800 input / 200 output tokens per request, 100,000 requests/month | $300.00cheaper | $1,000 |
RAG pipeline 6,000 input / 700 output tokens per request, 30,000 requests/month | $459.00cheaper | $1,530 |
Batch summarization 20,000 input / 1,500 output tokens per request, 5,000 requests/month | $217.50cheaper | $725.00 |
Gemini 3.5 Flash vs GPT-5.5 FAQ
- Is Gemini 3.5 Flash cheaper than GPT-5.5?
- Gemini 3.5 Flash costs $1.50 per 1M input tokens versus $5.00 for GPT-5.5 — Gemini 3.5 Flash is 70% cheaper per input token.
- Which is cheaper for output tokens, Gemini 3.5 Flash or GPT-5.5?
- Gemini 3.5 Flash charges $9.00 per 1M output tokens; GPT-5.5 charges $30.00 per 1M output tokens.
- Which has the larger context window, Gemini 3.5 Flash or GPT-5.5?
- GPT-5.5 does, with a 1,050,000-token context window.
- Do Gemini 3.5 Flash and GPT-5.5 offer cache pricing?
- Gemini 3.5 Flash discounts cached input to $0.15 per 1M tokens. GPT-5.5 discounts cached input to $0.50 per 1M tokens.
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