DeepSeek V4.1 Flash API
DeepSeek's chat model. Call it on 666 AI with the same API key as every other model. Pay as you go; prices follow the upstream in real time and this page updates hourly.
| Vendor | DeepSeek |
| Type | chat |
| Price | $0.1215 per 1M input tokens · $0.3375 per 1M output tokens |
| Context window | 64K tokens |
| Live test | Passed our live test in the last 7 days · 2 supply routes, automatic failover |
| Latency (short request) | Median ~2s (5+ calls in the last 7 days) |
| Model ID (use this in your request) | deepseek/deepseek-v4.1-flash |
How to call DeepSeek V4.1 Flash
The API is OpenAI-compatible. Replace YOUR-ENDPOINT with the endpoint shown on your API Key page after you sign up, and YOUR-KEY with your key.
curl https://YOUR-ENDPOINT/v1/chat/completions \
-H "Authorization: Bearer YOUR-KEY" \
-H "Content-Type: application/json" \
-d '{"model": "deepseek/deepseek-v4.1-flash", "messages": [{"role": "user", "content": "Hello"}]}'from openai import OpenAI
client = OpenAI(base_url="https://YOUR-ENDPOINT/v1", api_key="YOUR-KEY")
r = client.chat.completions.create(
model="deepseek/deepseek-v4.1-flash",
messages=[{"role": "user", "content": "Hello"}],
)
print(r.choices[0].message.content)Similar models — price comparison
| Model | Price |
|---|---|
| Ling 3.1 Flash | $0.1013 per 1M input tokens · $0.3037 per 1M output tokens |
| GLM 5.3 Flash | $0.1453 per 1M input tokens · $0.27 per 1M output tokens |
| DeepSeek V4 Flash 0731 | $0.081 per 1M input tokens · $0.378 per 1M output tokens |
| DeepSeek V4 1 Flash 260910 | $0.0985 per 1M input tokens · $0.3942 per 1M output tokens |
| DeepSeek V4 1 Flash 261017 | $0.0985 per 1M input tokens · $0.3942 per 1M output tokens |
| Mimo V2.6 Flash | $0.1607 per 1M input tokens · $0.378 per 1M output tokens |
More models from DeepSeek
| Model | Price |
|---|---|
| DeepSeek V4 Flash | $0.1229 per 1M input tokens · $0.2457 per 1M output tokens |
| DeepSeek V4 Pro | $1.29 per 1M input tokens · $2.58 per 1M output tokens |
| DeepSeek V4 Pro 0813 | $0.6075 per 1M input tokens · $1.08 per 1M output tokens |
| DeepSeek V4.1 Flash 1017 | $0.405 per 1M input tokens · $1.62 per 1M output tokens |
| DeepSeek R1 | $0.7142 per 1M input tokens · $3.07 per 1M output tokens |
| DeepSeek R1 0528 | $0.7709 per 1M input tokens · $3.09 per 1M output tokens |
| DeepSeek V4 Flash Latest | $0.0641 per 1M input tokens · $0.2117 per 1M output tokens |
| DeepSeek V4 Flash Vision Exp | $0.3942 per 1M input tokens · $1.58 per 1M output tokens |
FAQ
How much does the DeepSeek V4.1 Flash API cost?
On 666 AI, DeepSeek V4.1 Flash costs $0.1215 per 1M input tokens · $0.3375 per 1M output tokens. You pay only for what you use — no monthly fee. Prices follow the upstream in real time; this page updates every hour.
Can I use the official OpenAI SDK?
Yes. The API is OpenAI-compatible: in the OpenAI Python or Node.js SDK just change base_url and api_key, and set model to deepseek/deepseek-v4.1-flash.
How do I pay?
Bank card (including Google Pay / Apple Pay), USDT / ETH, or bank wire. Top up once and usage is deducted as you go.