DeepSeek V3.1 vs DeepSeek V4.1 Flash
deepseek/deepseek-v3.1 · deepseek/deepseek-v4.1-flash
As of November 8, 2026, DeepSeek V4.1 Flash is the cheaper API on UberLLM: $0.0001 per million input tokens and $0.0027 per million output, versus $0.0025 / $0.0094 for DeepSeek V3.1, about 73% less when output is 3 tokens for every input token. These are the best prices on the market right now. Both work with one OpenAI-compatible key and UberLLM adds no fee. Choose DeepSeek V4.1 Flash to cut cost; choose DeepSeek V3.1 when its capabilities fit your task better.
DeepSeek V3.1 vs DeepSeek V4.1 Flash, side by side
| Spec | DeepSeek V3.1 | DeepSeek V4.1 Flash |
|---|---|---|
| Price · input / 1M | $0.0025 | $0.0001 |
| Price · output / 1M | $0.0094 | $0.0027 |
| Context length | 128,000 | 1,048,576 |
| Max output tokens | 8,000 | 384,000 |
| Input modalities | text | text, image |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | — | Yes |
| Reasoning | — | Yes |
| % off list | 99% off | 99.7% off |
| First token, median (7 days) | — | 4.3 s (185,578 requests) |
Best prices on UberLLM right now. No UberLLM fee on requests; adding credit by card costs 5.5% + $0.50. Updated November 8, 2026. A price more than 70% below list is what buyers were billed, not an error. Why so cheap?
DeepSeek V3.1 vs DeepSeek V4.1 Flash — FAQ
Is DeepSeek V3.1 or DeepSeek V4.1 Flash cheaper?
DeepSeek V4.1 Flash is cheaper on a blended token mix, by about 73%. A request costs what its provider charged, UberLLM adds no fee, and every request is listed with its cost in Activity.
What's the price difference between DeepSeek V3.1 and DeepSeek V4.1 Flash?
DeepSeek V3.1: $0.0025 in / $0.0094 out per 1M tokens. DeepSeek V4.1 Flash: $0.0001 in / $0.0027 out per 1M tokens. That's roughly a 73% blended difference. Prices are live; UberLLM adds no fee.
Can I use both DeepSeek V3.1 and DeepSeek V4.1 Flash with one API?
Yes. Both are served through a single OpenAI-compatible endpoint — set the base URL to https://api.uberllm.dev/v1 and your UberLLM key, then switch between them by changing the model id. Anthropic SDKs work via https://api.uberllm.dev/v1/messages.