Deepseek V3.1 Terminus vs Deepseek v4 Flash

Live API pricing and availability, side by side. Both models run on FastInfra's OpenAI-compatible endpoint — switching between them is a one-line change.

Pricing

Price per 1M tokens

Prices are live and sync automatically from wholesale providers.

Deepseek V3.1 Terminus Deepseek v4 Flash
Input $0.28 $0.09
Output $1.00 $0.19
Default provider DeepInfra DeepInfra
Providers available 3 4

On input tokens, Deepseek v4 Flash is currently 3× cheaper than Deepseek V3.1 Terminus on FastInfra. Output-token pricing and quality trade-offs differ per workload — test both with the free tier.

Quickstart

Try both in 30 seconds

Same endpoint, same SDK — only the model string changes.

from openai import OpenAI

client = OpenAI(api_key="YOUR_API_KEY", base_url="https://api.fastinfra.ai/v1")

for model in ["deepseek/deepseek-v3.1-terminus", "deepseek/deepseek-v4-flash"]:
    response = client.chat.completions.create(
        model=model,
        messages=[{"role": "user", "content": "Hello!"}]
    )
    print(model, "->", response.choices[0].message.content)