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 WandAPI default channel price. Input costs 1 Credits / M for Gemini 3.1 Flash Image and 4 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-image
Google
Input (prompt)
1Credits / M
≈ $0.152
Output (completion)
6Credits / M
≈ $0.912
128K context · 32K output70% off
Gemini 3.1 Flash Image details
Gemini 3.1 Pro (Preview)gemini-3.1-pro-preview
Google
Input (prompt)
4Credits / M
≈ $0.608
Output (completion)
24Credits / M
≈ $3.65
1M context · 64K output70% off
Gemini 3.1 Pro (Preview) details
Lower input price
Gemini 3.1 Flash Image
75% cheaper
Larger context
Gemini 3.1 Pro (Preview)
128K · 1M
More exclusive capabilities
Gemini 3.1 Pro (Preview)
Function Calling, Prompt Caching, Response Schema

Specs side by side

Item
Gemini 3.1 Flash Imagegemini-3.1-flash-image
Gemini 3.1 Pro (Preview)gemini-3.1-pro-preview
Input (prompt) · Credits / M1≈ $0.1524≈ $0.608
Output (completion) · Credits / M6≈ $0.91224≈ $3.65
Cache read · Credits / M—0.4
Context window128K1M
Max output32K64K
7-day uptime—93.1%
Latest probe latency—3.4s
Measured throughput125.7 t/s5.1 t/s
ProtocolsGemini generateContentGemini generateContent / OpenAI Responses
Sample monthly cost (10M in + 2M out)22≈ $3.3488≈ $13.37

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

CapabilityGemini 3.1 Flash ImageGemini 3.1 Pro (Preview)
Vision
Reasoning
Video
Streaming
Function Calling
Prompt Caching
Response Schema
Audio
File Input
Web Search
Realtime
Session
Media
Multipart Form
Binary Response

FAQ

Which is cheaper, Gemini 3.1 Flash Image or Gemini 3.1 Pro (Preview)?

At the WandAPI default channel price, Gemini 3.1 Flash Image input costs 1 Credits / M and Gemini 3.1 Pro (Preview) input costs 4 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. 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 Flash Image and Gemini 3.1 Pro (Preview) differ?

Only Gemini 3.1 Flash Image: File Input, Web Search. 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

Gemini 3.1 Flash Image vs Gemini 2.5 Flash ImageGemini 3.1 Flash Image vs Gemini 3 Pro ImageGemini 3.1 Flash Image vs Gemini 3.1 Flash-Lite ImageGemini 3.1 Flash Image vs Gemini 3.5 FlashGemini 3.1 Flash Image vs Gemini 3.5 Flash-LiteGemini 3.1 Flash Image vs Gemini 3.6 FlashGemini 3.1 Flash Image vs Gemini 3.7 FlashGemini 3.1 Pro (Preview) vs Gemini 2.5 Flash ImageGemini 3.1 Pro (Preview) vs Gemini 3 Pro ImageGemini 3.1 Pro (Preview) vs Gemini 3.1 Flash-Lite ImageGemini 3.1 Pro (Preview) vs Gemini 3.5 FlashGemini 3.1 Pro (Preview) vs Gemini 3.5 Flash-Lite

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.

Get an API Key