DeepSeek V4 Flash Open vs 
Gemini 3.1 Pro Preview Paid
DeepSeek V4 Flash vs Gemini 3.1 Pro Preview compared — price per token, context window, multimodality, openness and which to choose. Can the open-source model replace the paid one? Full 2026 breakdown.
Gemini 3.1 Pro Preview — full profile ›
Prices & specs refreshed from live data · OpenSourceAI.tech
Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.
DeepSeek V4 Flash vs Gemini 3.1 Pro Preview specs
| Spec | DeepSeek V4 Flash | Gemini 3.1 Pro Preview |
|---|---|---|
| Maker | DeepSeek | |
| Type | Open-weight | Proprietary |
| Context window | 1M tokens | 1M tokens |
| Input price | $0.09/M · free self-host | $2/M |
| Output price | $0.19/M · free self-host | $12/M |
| Vision / multimodal | No | Yes |
| Tool / function calling | Yes | Yes |
| Self-hostable | Yes | No (API only) |
| License | MIT | Proprietary |
Feature comparison
| Capability | DeepSeek V4 Flash | Gemini 3.1 Pro Preview |
|---|---|---|
| Open weights (downloadable) | ✓ | ✗ |
| Self-hostable | ✓ | ✗ |
| Runs fully offline | ✓ | ✗ |
| Vision / multimodal | ✗ | ✓ |
| Tool / function calling | ✓ | ✓ |
| 1M+ context window | ✓ | ✓ |
Benchmarks: DeepSeek V4 Flash vs Gemini 3.1 Pro Preview
Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).
Benchmark data by Artificial Analysis.
How DeepSeek V4 Flash and Gemini 3.1 Pro Preview score
| Criterion | DeepSeek V4 Flash | Gemini 3.1 Pro Preview |
|---|---|---|
| Cost-efficiency | 5.0 | 3.5 |
| Context window | 5.0 | 5.0 |
| Openness | 5.0 | 1.5 |
| Self-hosting | 5.0 | 1.0 |
| Multimodality | 3.5 | 5.0 |
Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.
What each model is
DeepSeek V4 Flash Open
DeepSeek V4 Flash is an efficiency-optimized Mixture-of-Experts model from DeepSeek with 284B total parameters and 13B activated parameters, supporting a 1M-token context window. It is designed for fast inference and...
Gemini 3.1 Pro Preview Paid
Gemini 3.1 Pro Preview is Google’s frontier reasoning model, delivering enhanced software engineering performance, improved agentic reliability, and more efficient token usage across complex workflows. Building on the multimodal foundation.
Other models in these families
These variants are tracked but not compared here — one page per family keeps the comparison readable.
Frequently asked questions
Is DeepSeek V4 Flash as good as Gemini 3.1 Pro Preview?
DeepSeek V4 Flash is open-weight and competitive on many tasks, but Gemini 3.1 Pro Preview may still lead on the hardest reasoning and agentic work. The gap keeps narrowing — benchmark both on your actual use case before deciding.
Can I run DeepSeek V4 Flash locally?
Yes. DeepSeek V4 Flash has open weights, so you can self-host it on your own GPUs or run it via a low-cost API. Gemini 3.1 Pro Preview is API-only and cannot be self-hosted.
How much cheaper is DeepSeek V4 Flash?
DeepSeek V4 Flash costs $0.19/M output vs $12/M for Gemini 3.1 Pro Preview — roughly 63x cheaper via API, and free if you self-host.
DeepSeek V4 Flash vs Gemini 3.1 Pro Preview — which should I pick in 2026?
Choose DeepSeek V4 Flash if you want to self-host, keep your data private and skip per-token fees — it's open-weight and runs on your own hardware. Choose Gemini 3.1 Pro Preview if you want frontier capability through a managed API with zero infrastructure to run.
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