Gemini 3.1 Pro (Preview) vs Gemini 3.8 Flash
Gemini 3.1 Pro (Preview) (Google) versus Gemini 3.8 Flash (Google): API pricing, context window, capabilities and uptime, from the same data as each model page, at the WandAPI default channel price. Input costs 4 Credits / M for Gemini 3.1 Pro (Preview) and 1.5 Credits / M for Gemini 3.8 Flash, so Gemini 3.8 Flash is 63% cheaper. Context windows are 1M and 1M.
Gemini 3.1 Pro (Preview)gemini-3.1-pro-previewGemini 3.8 Flashgemini-3.8-flashSpecs side by side
| Item | Gemini 3.1 Pro (Preview)gemini-3.1-pro-preview | Gemini 3.8 Flashgemini-3.8-flash |
|---|---|---|
| Input (prompt) · Credits / M | 4≈ $0.608 | 1.5≈ $0.228 |
| Output (completion) · Credits / M | 24≈ $3.65 | 7.5≈ $1.14 |
| Cache read · Credits / M | 0.4 | 0.15 |
| Context window | 1M | 1M |
| Max output | 64K | 64K |
| 7-day uptime | 93.1% | 95.1% |
| Latest probe latency | 3.1s | 3.9s |
| Measured throughput | 5.1 t/s | 103.8 t/s |
| Protocols | Gemini generateContent / OpenAI Responses | Anthropic Messages / Gemini generateContent / OpenAI Responses |
| Sample monthly cost (10M in + 2M out) | 88≈ $13.37 | 30≈ $4.56 |
Prices are the WandAPI default channel price in Credits (1 Credit = ¥1); green marks the better side. Uptime and latency come from WandAPI probes; a dash means the model is not probed yet.
Capabilities
FAQ
Which is cheaper, Gemini 3.1 Pro (Preview) or Gemini 3.8 Flash?
At the WandAPI default channel price, Gemini 3.1 Pro (Preview) input costs 4 Credits / M and Gemini 3.8 Flash input costs 1.5 Credits / M, so Gemini 3.8 Flash is 63% cheaper. Output and cache prices are in the specs table above.
Which has the larger context window, Gemini 3.1 Pro (Preview) or Gemini 3.8 Flash?
Gemini 3.1 Pro (Preview) offers 1M tokens, Gemini 3.8 Flash offers 1M tokens.
Can I switch between Gemini 3.1 Pro (Preview) and Gemini 3.8 Flash at any time?
Yes. WandAPI 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 Pro (Preview) and Gemini 3.8 Flash differ?
Only Gemini 3.8 Flash: File Input, Web Search. 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 Pro (Preview) and Gemini 3.8 Flash
Free credits on sign-up, pay as you go, no monthly fee.