Gemini 3.1 Flash Image vs Gemini 3.1 Pro Preview
Gemini 3.1 Flash Image (Google) versus Gemini 3.1 Pro Preview (Google): API pricing, context window, capabilities and uptime, from the same data as each model page, at the SoleAPI default channel price. Input costs 0.8 Credits / M for Gemini 3.1 Flash Image and 3.2 Credits / M for Gemini 3.1 Pro Preview, so Gemini 3.1 Flash Image is 75% cheaper. Context windows are 128K and 1M.
Gemini 3.1 Flash Imagegemini-3.1-flash-imageGemini 3.1 Pro Previewgemini-3.1-pro-previewSpecs side by side
| Item | Gemini 3.1 Flash Imagegemini-3.1-flash-image | Gemini 3.1 Pro Previewgemini-3.1-pro-preview |
|---|---|---|
| Input (prompt) · Credits / M | 0.8≈ $0.121 | 3.2≈ $0.485 |
| Output (completion) · Credits / M | 4.8≈ $0.727 | 19.2≈ $2.91 |
| Cache read · Credits / M | — | 0.32 |
| Context window | 128K | 1M |
| Max output | 32K | 64K |
| 7-day uptime | — | 90.1% |
| Latest probe latency | — | 3.07 s |
| Measured throughput | 78.9 t/s | 76.7 t/s |
| Protocols | Anthropic Messages / Gemini generateContent | Anthropic Messages / Gemini generateContent |
| Sample monthly cost (10M in + 2M out) | 17.6≈ $2.67 | 70.4≈ $10.66 |
Prices are the SoleAPI default channel price in Credits (1 Credit = ¥1); green marks the better side. Uptime and latency come from SoleAPI probes; a dash means the model is not probed yet.
Capabilities
FAQ
Which is cheaper, Gemini 3.1 Flash Image or Gemini 3.1 Pro Preview?
At the SoleAPI default channel price, Gemini 3.1 Flash Image input costs 0.8 Credits / M and Gemini 3.1 Pro Preview input costs 3.2 Credits / M, so Gemini 3.1 Flash Image is 75% cheaper. Output and cache prices are in the specs table above.
Which has the larger context window, Gemini 3.1 Flash Image or Gemini 3.1 Pro Preview?
Gemini 3.1 Flash Image offers 128K tokens, Gemini 3.1 Pro Preview offers 1M tokens.
Can I switch between Gemini 3.1 Flash Image and Gemini 3.1 Pro Preview at any time?
Yes. SoleAPI calls every model with the same API key; switching is just changing the model field in the request, and billing is split per model in one console.
How do the capabilities of Gemini 3.1 Flash Image and Gemini 3.1 Pro Preview differ?
Only Gemini 3.1 Pro Preview: Function Calling, Prompt Caching, Response Schema, Audio. Every other capability is either supported by both or by neither; see the capability table above.
More comparisons
One API key for both Gemini 3.1 Flash Image and Gemini 3.1 Pro Preview
Free credits on sign-up, pay as you go, no monthly fee.