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Model comparison

DeepSeek V4 Flash 0731 vs Kimi K3

DeepSeek V4 Flash 0731 (DeepSeek) and Kimi K3 (Moonshot) side by side: what each costs per million tokens through Rapid Router, how much context each takes, what each supports, and where independent benchmarks place them. Same API, same key; switching is a one-string change.

DeepSeek V4 Flash 0731Kimi K3
Input price per 1M$0.060$0.304
Output price per 1M$0.180$11.94
Context window1M tokens1M tokens
Max output944K tokens131K tokens
Input typestexttext, image, video
Capabilitiestools, JSON, reasoningtools, JSON, vision, reasoning
AuthorDeepSeekMoonshot

What a month costs on each

WorkloadDeepSeek V4 Flash 0731Kimi K3
Chatbot month (15M in, 4M out)$1.62$52.30
RAG month (40M in, 3M out)$2.94$47.97
Coding month (60M in, 10M out)$5.40$137.60

On a typical 75/25 input-output mix, DeepSeek V4 Flash 0731 costs less (about 97% less than Kimi K3). DeepSeek V4 Flash 0731 takes the longer prompt at 1M tokens. Try your own numbers in the cost calculator.

Call either one

curl https://rapidrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $RAPIDROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "deepseek/deepseek-v4-flash-0731", "messages": [{"role": "user", "content": "Hello"}]}'

# the other one: change the model string
  -d '{"model": "moonshotai/kimi-k3", ...}'

Common questions

Which is cheaper, DeepSeek V4 Flash 0731 or Kimi K3?

DeepSeek V4 Flash 0731 is cheaper on a typical mix of 75% input and 25% output tokens, by about 97%. Through Rapid Router both are billed at the provider list price per million tokens.

Which has the larger context window?

DeepSeek V4 Flash 0731, at 1M tokens. Kimi K3 offers 1M tokens.

Can I switch between DeepSeek V4 Flash 0731 and Kimi K3 without changing code?

Yes. Both are callable at https://rapidrouter.ai/api/v1 with the same OpenAI-compatible request; only the model string changes (deepseek/deepseek-v4-flash-0731 or moonshotai/kimi-k3).

How do I pay for DeepSeek V4 Flash 0731 or Kimi K3?

Top up a Rapid Router balance by card in US dollars, and both models debit that balance per request.

More DeepSeek models: DeepSeek API pricing · More Kimi: Moonshot API pricing