Solar Pro 4 is $0.1 cheaper per 1M input tokens (76% lower; 4.17x difference).
API cost decision in 10 seconds
Solar Pro 4 vs Gemini 3.1 Flash Lite (batch)
Pick Solar Pro 4 for lower cost; pick Gemini 3.1 Flash Lite (batch) 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 Solar Pro 4 for lower cost; pick Gemini 3.1 Flash Lite (batch) only if the larger context window matters more.
On the standard 1M input plus 500K output workload, Solar Pro 4 is estimated at $0.09 vs $0.5 for Gemini 3.1 Flash Lite (batch), saving $0.41 (82% lower).
Cost-first pickSolar Pro 4
Context-first pickGemini 3.1 Flash Lite (batch)
Sample savings$0.4182%
10x traffic gap$4.1
Gemini 3.1 Flash Lite (batch) has more context, but Solar Pro 4 saves $0.41 on the standard workload. At 10x that traffic, the same price gap is about $4.1. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
Solar Pro 4 stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | Solar Pro 4 | Gemini 3.1 Flash Lite (batch) |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | Solar Pro 4 | $0.21 | $1 |
| Balanced workload | 1M input + 1M output | Solar Pro 4 | $0.15 | $0.88 |
| Output-heavy chatbot | 1M input + 5M output | Solar Pro 4 | $0.63 | $3.88 |
Solar Pro 4 is $0.63 cheaper per 1M output tokens (84% lower; 6.25x difference).
Gemini 3.1 Flash Lite (batch) has 524.29K more context (2x larger).
Solar Pro 4 is $0.41 cheaper on the standard workload (82% 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
Solar Pro 4 has the lower input price; Solar Pro 4 has the lower output price; Gemini 3.1 Flash Lite (batch) offers the larger context window. For the 1M input plus 500K output sample, Solar Pro 4 is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $0.09 for Solar Pro 4 and $0.5 for Gemini 3.1 Flash Lite (batch).
Choose Solar Pro 4 when you care most about lower input-token price, and lower output-token price.
Choose Gemini 3.1 Flash Lite (batch) when you care most about larger context window.
- On the standard 1M input plus 500K output workload, Solar Pro 4 is estimated at $0.09 vs $0.5 for Gemini 3.1 Flash Lite (batch), saving $0.41 (82% lower).
- Solar Pro 4 is $0.41 cheaper on the standard workload (82% lower).
- Solar Pro 4 is $0.1 cheaper per 1M input tokens (76% lower; 4.17x difference).
- Solar Pro 4 is $0.63 cheaper per 1M output tokens (84% lower; 6.25x difference).
- Gemini 3.1 Flash Lite (batch) has 524.29K more context (2x larger).
| Feature | Solar Pro 4 (Upstage) | Gemini 3.1 Flash Lite (batch) (Google) |
|---|---|---|
| Input Price prompt tokens per 1M | $0.03 | $0.125 |
| Completion Price per 1M tokens | $0.12 | $0.75 |
| Sample Workload Cost 1M input + 500K output | $0.09 | $0.5 |
| Context Window | 524.29K | 1.05M |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | Solar Pro 4 | On the standard 1M input plus 500K output workload, Solar Pro 4 is estimated at $0.09 vs $0.5 for Gemini 3.1 Flash Lite (batch), saving $0.41 (82% lower). |
| High-volume input processing | Solar Pro 4 | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | Solar Pro 4 | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | Gemini 3.1 Flash Lite (batch) | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- Gemma 4 26B A4B (free) can replace Gemini 3.1 Flash Lite (batch) when lower sample workload cost matters most: $0.
- Gemma 4 31B (free) can replace Gemini 3.1 Flash Lite (batch) when lower sample workload cost matters most: $0.
- Lyria 3 Pro Preview can replace Gemini 3.1 Flash Lite (batch) when lower sample workload cost matters most: $0.
- Lyria 3 Clip Preview can replace Gemini 3.1 Flash Lite (batch) when lower sample workload cost matters most: $0.
- DeepSeek V4 Flash 0731 offers 1.31M context with $0.17 sample workload cost.
- DeepSeek V4 Flash Latest offers 1.31M context with $0.11 sample workload cost.
- Llama 4 Scout offers 1.31M context with $0.25 sample workload cost.
- MiMo-V2.5 offers 1.05M context with $0.28 sample workload cost.
- DeepSeek V4 Flash 0731 · DeepSeek · #1
- MiMo-V2.5 · Xiaomi · #2
- Hy3 · Tencent · #3
- Ox Alpha · stealth · #4
Cheaper alternatives
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Open Google modelsSolar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window. It is built for long-horizon tasks and agentic workflows, with strong capabilities in office productivity, document-intensive...
Gemini 3.1 Flash Lite is Google’s GA high-efficiency multimodal model optimized for low-latency, high-volume workloads. It supports text, image, video, audio, and PDF inputs, and is designed for lightweight agentic...