Gemini 3.1 Flash Lite Preview is $29.75 cheaper per 1M input tokens (99.2% lower; 120x difference).
API cost decision in 10 seconds
Gemini 3.1 Flash Lite Preview vs GPT-5.5 Pro
Pick Gemini 3.1 Flash Lite Preview for lower cost; pick GPT-5.5 Pro only if the larger context window matters more.
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Data confirmed:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Pick Gemini 3.1 Flash Lite Preview for lower cost; pick GPT-5.5 Pro only if the larger context window matters more.
On the standard 1M input plus 500K output workload, Gemini 3.1 Flash Lite Preview is estimated at $1 vs $120 for GPT-5.5 Pro, saving $119 (99.2% lower).
Cost-first pickGemini 3.1 Flash Lite Preview
Context-first pickGPT-5.5 Pro
Sample savings$11999.2%
10x traffic gap$1190
GPT-5.5 Pro has more context, but Gemini 3.1 Flash Lite Preview saves $119 on the standard workload. At 10x that traffic, the same price gap is about $1190. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
Gemini 3.1 Flash Lite Preview stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | Gemini 3.1 Flash Lite Preview | GPT-5.5 Pro |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | Gemini 3.1 Flash Lite Preview | $2 | $240 |
| Balanced workload | 1M input + 1M output | Gemini 3.1 Flash Lite Preview | $1.75 | $210 |
| Output-heavy chatbot | 1M input + 5M output | Gemini 3.1 Flash Lite Preview | $7.75 | $930 |
Gemini 3.1 Flash Lite Preview is $178.5 cheaper per 1M output tokens (99.2% lower; 120x difference).
GPT-5.5 Pro has 1.42K more context (1x larger).
Gemini 3.1 Flash Lite Preview is $119 cheaper on the standard workload (99.2% lower).
Estimate your workload cost
Your Workload Cost
This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.
Quick Decision
Gemini 3.1 Flash Lite Preview has the lower input price; Gemini 3.1 Flash Lite Preview has the lower output price; GPT-5.5 Pro offers the larger context window. For the 1M input plus 500K output sample, Gemini 3.1 Flash Lite Preview is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $1 for Gemini 3.1 Flash Lite Preview and $120 for GPT-5.5 Pro.
Choose Gemini 3.1 Flash Lite Preview when you care most about lower input-token price, and lower output-token price.
Choose GPT-5.5 Pro when you care most about larger context window.
- On the standard 1M input plus 500K output workload, Gemini 3.1 Flash Lite Preview is estimated at $1 vs $120 for GPT-5.5 Pro, saving $119 (99.2% lower).
- Gemini 3.1 Flash Lite Preview is $119 cheaper on the standard workload (99.2% lower).
- Gemini 3.1 Flash Lite Preview is $29.75 cheaper per 1M input tokens (99.2% lower; 120x difference).
- Gemini 3.1 Flash Lite Preview is $178.5 cheaper per 1M output tokens (99.2% lower; 120x difference).
- GPT-5.5 Pro has 1.42K more context (1x larger).
| Feature | Gemini 3.1 Flash Lite Preview (Google) | GPT-5.5 Pro (OpenAI) |
|---|---|---|
| Input Price prompt tokens per 1M | $0.25 | $30 |
| Completion Price per 1M tokens | $1.5 | $180 |
| Sample Workload Cost 1M input + 500K output | $1 | $120 |
| Context Window | 1.05M | 1.05M |
| Release Date | ||
| Popularity | #22 | #122 |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | Gemini 3.1 Flash Lite Preview | On the standard 1M input plus 500K output workload, Gemini 3.1 Flash Lite Preview is estimated at $1 vs $120 for GPT-5.5 Pro, saving $119 (99.2% lower). |
| High-volume input processing | Gemini 3.1 Flash Lite Preview | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | Gemini 3.1 Flash Lite Preview | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | GPT-5.5 Pro | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- Gemma 4 31B (free) can replace Gemini 3.1 Flash Lite Preview when lower sample workload cost matters most: $0.
- Gemma 4 26B A4B (free) can replace Gemini 3.1 Flash Lite Preview when lower sample workload cost matters most: $0.
- Lyria 3 Clip Preview can replace Gemini 3.1 Flash Lite Preview when lower sample workload cost matters most: $0.
- Lyria 3 Pro Preview can replace Gemini 3.1 Flash Lite Preview when lower sample workload cost matters most: $0.
- Llama 4 Scout offers 10M context with $0.23 sample workload cost.
- Grok 4.20 offers 2M context with $2.5 sample workload cost.
- Grok 4.20 Multi-Agent offers 2M context with $5 sample workload cost.
- DeepSeek V4 Flash · DeepSeek · #1
- Hy3 preview · Tencent · #2
- Claude Opus 4.7 · Anthropic · #3
- Claude Sonnet 4.6 · Anthropic · #4
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