Gemini 3.1 Pro Preview vs Gemini 3.7 Flash

Gemini 3.1 Pro Preview (Google) versus Gemini 3.7 Flash (Google): API pricing, context window, capabilities and uptime, from the same data as each model page, at the SoleAPI default channel price. Input costs 3.2 Credits / M for Gemini 3.1 Pro Preview and 1.2 Credits / M for Gemini 3.7 Flash, so Gemini 3.7 Flash is 63% cheaper. Context windows are 1M and 1M.

Gemini 3.1 Pro Previewgemini-3.1-pro-preview
Google
Input (prompt)
3.2Credits / M
≈ $0.485
Output (completion)
19.2Credits / M
≈ $2.91
1M context · 64K output76% off
Gemini 3.1 Pro Preview details
Gemini 3.7 Flashgemini-3.7-flash
Google
Input (prompt)
1.2Credits / M
≈ $0.182
Output (completion)
6Credits / M
≈ $0.909
1M context · 64K output76% off
Gemini 3.7 Flash details
Lower input price
Gemini 3.7 Flash
63% cheaper
Higher 7-day uptime
Gemini 3.7 Flash
90.1% · 92.6%
More exclusive capabilities
Gemini 3.1 Pro Preview
Audio

Specs side by side

Item
Gemini 3.1 Pro Previewgemini-3.1-pro-preview
Gemini 3.7 Flashgemini-3.7-flash
Input (prompt) · Credits / M3.2≈ $0.4851.2≈ $0.182
Output (completion) · Credits / M19.2≈ $2.916≈ $0.909
Cache read · Credits / M0.320.12
Context window1M1M
Max output64K64K
7-day uptime90.1%92.6%
Latest probe latency3.07 s3.51 s
Measured throughput76.7 t/s44.2 t/s
ProtocolsAnthropic Messages / Gemini generateContentAnthropic Messages / Gemini generateContent
Sample monthly cost (10M in + 2M out)70.4≈ $10.6624≈ $3.63

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

CapabilityGemini 3.1 Pro PreviewGemini 3.7 Flash
Vision
Function Calling
Reasoning
Prompt Caching
Response Schema
Video
File Input
Streaming
Web Search
Audio
Realtime
Session
Media
Multipart Form
Binary Response

FAQ

Which is cheaper, Gemini 3.1 Pro Preview or Gemini 3.7 Flash?

At the SoleAPI default channel price, Gemini 3.1 Pro Preview input costs 3.2 Credits / M and Gemini 3.7 Flash input costs 1.2 Credits / M, so Gemini 3.7 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 3.7 Flash?

Gemini 3.1 Pro Preview offers 1M tokens, Gemini 3.7 Flash offers 1M tokens.

Can I switch between Gemini 3.1 Pro Preview and Gemini 3.7 Flash 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 Pro Preview and Gemini 3.7 Flash differ?

Only Gemini 3.1 Pro Preview: Audio. Every other capability is either supported by both or by neither; see the capability table above.

More comparisons

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One API key for both Gemini 3.1 Pro Preview and Gemini 3.7 Flash

Free credits on sign-up, pay as you go, no monthly fee.

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