Gemini 3.1 Pro (Preview) vs Gemini 3.8 Flash-Lite TTS

Gemini 3.1 Pro (Preview) (Google) versus Gemini 3.8 Flash-Lite TTS (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 Credits / M for Gemini 3.8 Flash-Lite TTS, so Gemini 3.8 Flash-Lite TTS is 75% cheaper. Context windows are 1M and 8K.

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
Gemini 3.8 Flash-Lite TTSgemini-3.8-flash-lite-tts
Google
Input (prompt)
1Credits / M
≈ $0.152
Output (completion)
—Credits / M
8K context · 16K output70% off
Gemini 3.8 Flash-Lite TTS details
Lower input price
Gemini 3.8 Flash-Lite TTS
75% cheaper
Larger context
Gemini 3.1 Pro (Preview)
1M · 8K
More exclusive capabilities
Gemini 3.1 Pro (Preview)
Vision, Function Calling, Reasoning

Specs side by side

Item
Gemini 3.1 Pro (Preview)gemini-3.1-pro-preview
Gemini 3.8 Flash-Lite TTSgemini-3.8-flash-lite-tts
Input (prompt) · Credits / M4≈ $0.6081≈ $0.152
Output (completion) · Credits / M24≈ $3.65—
Cache read · Credits / M0.4—
Context window1M8K
Max output64K16K
7-day uptime93.1%—
Latest probe latency3.4s—
Measured throughput5.1 t/s—
ProtocolsGemini generateContent / OpenAI ResponsesGemini generateContent
Sample monthly cost (10M in + 2M out)88≈ $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 Pro (Preview)Gemini 3.8 Flash-Lite TTS
Audio
Streaming
Vision
Function Calling
Reasoning
Prompt Caching
Response Schema
Video
File Input
Web Search
Realtime
Session
Media
Multipart Form
Binary Response

FAQ

Which is cheaper, Gemini 3.1 Pro (Preview) or Gemini 3.8 Flash-Lite TTS?

At the WandAPI default channel price, Gemini 3.1 Pro (Preview) input costs 4 Credits / M and Gemini 3.8 Flash-Lite TTS input costs 1 Credits / M, so Gemini 3.8 Flash-Lite TTS is 75% 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-Lite TTS?

Gemini 3.1 Pro (Preview) offers 1M tokens, Gemini 3.8 Flash-Lite TTS offers 8K tokens.

Can I switch between Gemini 3.1 Pro (Preview) and Gemini 3.8 Flash-Lite TTS 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-Lite TTS differ?

Only Gemini 3.1 Pro (Preview): Vision, Function Calling, Reasoning, Prompt Caching, Response Schema, Video. 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 3.8 Flash-Lite TTS

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

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