Gemini 2.5 Pro vs Gemini 3.8 Flash

Gemini 2.5 Pro (Google) versus Gemini 3.8 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 2 Credits / M for Gemini 2.5 Pro and 1.2 Credits / M for Gemini 3.8 Flash, so Gemini 3.8 Flash is 40% cheaper. Context windows are 1M and 1M.

Gemini 2.5 Progemini-2.5-pro
Google
Input (prompt)
2Credits / M
≈ $0.303
Output (completion)
16Credits / M
≈ $2.42
1M context · 64K output76% off
Gemini 2.5 Pro details
Gemini 3.8 Flashgemini-3.8-flash
Google
Input (prompt)
1.2Credits / M
≈ $0.182
Output (completion)
6Credits / M
≈ $0.909
1M context · 64K output76% off
Gemini 3.8 Flash details
Lower input price
Gemini 3.8 Flash
40% cheaper

Specs side by side

Item
Gemini 2.5 Progemini-2.5-pro
Gemini 3.8 Flashgemini-3.8-flash
Input (prompt) · Credits / M2≈ $0.3031.2≈ $0.182
Output (completion) · Credits / M16≈ $2.426≈ $0.909
Cache read · Credits / M0.20.12
Context window1M1M
Max output64K64K
7-day uptime——
Latest probe latency——
Measured throughput60.1 t/s83.9 t/s
ProtocolsAnthropic Messages / Gemini generateContentAnthropic Messages / Gemini generateContent
Sample monthly cost (10M in + 2M out)52≈ $7.8724≈ $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 2.5 ProGemini 3.8 Flash
Vision
Function Calling
Reasoning
Prompt Caching
Response Schema
Audio
Video
File Input
Streaming
Web Search
Realtime
Session
Media
Multipart Form
Binary Response

FAQ

Which is cheaper, Gemini 2.5 Pro or Gemini 3.8 Flash?

At the SoleAPI default channel price, Gemini 2.5 Pro input costs 2 Credits / M and Gemini 3.8 Flash input costs 1.2 Credits / M, so Gemini 3.8 Flash is 40% cheaper. Output and cache prices are in the specs table above.

Which has the larger context window, Gemini 2.5 Pro or Gemini 3.8 Flash?

Gemini 2.5 Pro offers 1M tokens, Gemini 3.8 Flash offers 1M tokens.

Can I switch between Gemini 2.5 Pro and Gemini 3.8 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 2.5 Pro and Gemini 3.8 Flash differ?

Their capability flags are identical. 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 2.5 Pro and Gemini 3.8 Flash

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

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