DeepSeek: DeepSeek V4.1 Flash vs Microsoft Decision-1
DeepSeek V4.1 Flash has more Credits provider routes and the larger context window. Microsoft Decision-1 has the lower published input-plus-output rate. There is not enough recent probe data to compare speed. Compare price, speed, context, and privacy.
Practical read
Monthly evidenceDeepSeek V4.1 Flash has more Credits provider routes and the larger context window. Microsoft Decision-1 has the lower published input-plus-output rate. There is not enough recent probe data to compare speed.
The price comparison adds each route's rate for one million input tokens and one million output tokens; your cost depends on your input/output mix. Prices and live route measurements can change. Use the monthly reports when you need a stable evidence window, then run a small task-specific eval before choosing a production default.
deepseek/deepseek-v4.1-flashmicrosoft/microsoft-decision-1
DeepSeek: DeepSeek V4.1 Flash routes
Microsoft Decision-1 routes
- Overview1 Credits routes
Related comparisons
Browse every comparison- DeepSeek: DeepSeek V4.1 Flash vs Z.ai: GLM 5.3 Flash58 combined provider routes
- DeepSeek: DeepSeek V4.1 Flash vs Z.ai: GLM 5.357 combined provider routes
- DeepSeek: DeepSeek V4.1 Flash vs Z.ai: GLM 5.256 combined provider routes
- DeepSeek: DeepSeek V4.1 Flash vs MoonshotAI: Kimi K353 combined provider routes
- DeepSeek: DeepSeek V4 Flash 0731 vs DeepSeek: DeepSeek V4.1 Flash51 combined provider routes
- DeepSeek: DeepSeek V4.1 Flash vs OpenAI: gpt-oss-120b47 combined provider routes
- DeepSeek: DeepSeek V4.1 Flash vs Qwen: Qwen3.8 27B42 combined provider routes
- DeepSeek: DeepSeek V4.1 Flash vs Google: Gemma 4 31B41 combined provider routes
Pick a default model. Keep fallback enabled.
TrustedRouter is useful when you know the model you want, but still need provider rollover, budget limits, usage records, and a prompt path you can verify.
client = OpenAI(
base_url="https://api.trustedrouter.com/v1",
api_key="sk-tr-v1-..."
)
response = client.chat.completions.create(
model="deepseek/deepseek-v4.1-flash",
messages=messages,
)Questions
Which should I use, DeepSeek: DeepSeek V4.1 Flash or Microsoft Decision-1?
DeepSeek V4.1 Flash has more Credits provider routes and the larger context window. Microsoft Decision-1 has the lower published input-plus-output rate. There is not enough recent probe data to compare speed.
Is DeepSeek: DeepSeek V4.1 Flash or Microsoft Decision-1 cheaper?
The current cheapest TrustedRouter route is $0.1266/1M for DeepSeek: DeepSeek V4.1 Flash and $0.04431/1M for Microsoft Decision-1. The comparison uses current catalog prices and updates as provider pricing changes.
Is DeepSeek: DeepSeek V4.1 Flash or Microsoft Decision-1 faster?
Current measured p50 time to first token is 796 ms for DeepSeek: DeepSeek V4.1 Flash and not enough data for Microsoft Decision-1. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.
Can I test DeepSeek: DeepSeek V4.1 Flash and Microsoft Decision-1 with the same API?
Yes. Both take the same request on POST /api/alpha/decide, with the same TrustedRouter base URL and API key, so a side-by-side eval changes only the model id between deepseek/deepseek-v4.1-flash and microsoft/microsoft-decision-1. Microsoft Decision-1 does not take chat requests.