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Model comparison

DeepSeek V4 Flash 0731 vs GLM-5.3-Flash

DeepSeek V4 Flash 0731 (DeepSeek) and GLM-5.3-Flash (Z.ai) 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 0731GLM-5.3-Flash
Input price per 1M$0.060$0.012
Output price per 1M$0.180$0.900
Context window1M tokens1M tokens
Max output944K tokens131K tokens
Input typestexttext, image, video, pdf
Capabilitiestools, JSON, reasoningtools, JSON, vision, reasoning
AuthorDeepSeekZ.ai

What a month costs on each

WorkloadDeepSeek V4 Flash 0731GLM-5.3-Flash
Chatbot month (15M in, 4M out)$1.62$3.78
RAG month (40M in, 3M out)$2.94$3.18
Coding month (60M in, 10M out)$5.40$9.72

On a typical 75/25 input-output mix, DeepSeek V4 Flash 0731 costs less (about 62% less than GLM-5.3-Flash). 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": "z-ai/glm-5.3-flash", ...}'

Common questions

Which is cheaper, DeepSeek V4 Flash 0731 or GLM-5.3-Flash?

DeepSeek V4 Flash 0731 is cheaper on a typical mix of 75% input and 25% output tokens, by about 62%. 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. GLM-5.3-Flash offers 1M tokens.

Can I switch between DeepSeek V4 Flash 0731 and GLM-5.3-Flash 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 z-ai/glm-5.3-flash).

How do I pay for DeepSeek V4 Flash 0731 or GLM-5.3-Flash?

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 GLM: Z.ai API pricing