Gemini 2.5 Flash vs Gemini 3.1 Flash Image
Gemini 2.5 Flash (Google) versus Gemini 3.1 Flash Image (Google): API pricing, context window, capabilities and uptime, from the same data as each model page, at the SoleAPI default channel price. Input costs 0.48 Credits / M for Gemini 2.5 Flash and 0.8 Credits / M for Gemini 3.1 Flash Image, so Gemini 2.5 Flash is 40% cheaper. Context windows are 1M and 128K.
Gemini 2.5 Flashgemini-2.5-flashGemini 3.1 Flash Imagegemini-3.1-flash-imageSpecs side by side
| Item | Gemini 2.5 Flashgemini-2.5-flash | Gemini 3.1 Flash Imagegemini-3.1-flash-image |
|---|---|---|
| Input (prompt) · Credits / M | 0.48≈ $0.0727 | 0.8≈ $0.121 |
| Output (completion) · Credits / M | 4≈ $0.606 | 4.8≈ $0.727 |
| Cache read · Credits / M | 0.048 | — |
| Context window | 1M | 128K |
| Max output | 64K | 32K |
| 7-day uptime | — | — |
| Latest probe latency | — | — |
| Measured throughput | 80.7 t/s | 78.9 t/s |
| Protocols | Anthropic Messages / Gemini generateContent | Anthropic Messages / Gemini generateContent |
| Sample monthly cost (10M in + 2M out) | 12.8≈ $1.94 | 17.6≈ $2.67 |
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
FAQ
Which is cheaper, Gemini 2.5 Flash or Gemini 3.1 Flash Image?
At the SoleAPI default channel price, Gemini 2.5 Flash input costs 0.48 Credits / M and Gemini 3.1 Flash Image input costs 0.8 Credits / M, so Gemini 2.5 Flash is 40% cheaper. Output and cache prices are in the specs table above.
Which has the larger context window, Gemini 2.5 Flash or Gemini 3.1 Flash Image?
Gemini 2.5 Flash offers 1M tokens, Gemini 3.1 Flash Image offers 128K tokens.
Can I switch between Gemini 2.5 Flash and Gemini 3.1 Flash Image 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 Flash and Gemini 3.1 Flash Image differ?
Only Gemini 2.5 Flash: Function Calling, Prompt Caching, Response Schema, Audio. Only Gemini 3.1 Flash Image: Video, File Input. Every other capability is either supported by both or by neither; see the capability table above.
More comparisons
One API key for both Gemini 2.5 Flash and Gemini 3.1 Flash Image
Free credits on sign-up, pay as you go, no monthly fee.