Model comparison
DeepSeek V4 Pro vs GLM-5.1
DeepSeek V4 Pro (DeepSeek) and GLM-5.1 (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 Pro | GLM-5.1 | |
|---|---|---|
| Input price per 1M | $1.30 | $1.05 |
| Output price per 1M | $2.60 | $3.50 |
| Context window | 1M tokens | 200K tokens |
| Max output | 393K tokens | 131K tokens |
| Input types | text | text |
| Capabilities | tools, JSON, reasoning | tools, JSON, reasoning |
| Author | DeepSeek | Z.ai |
What a month costs on each
| Workload | DeepSeek V4 Pro | GLM-5.1 |
|---|---|---|
| Chatbot month (15M in, 4M out) | $29.90 | $29.75 |
| RAG month (40M in, 3M out) | $59.80 | $52.50 |
| Coding month (60M in, 10M out) | $104.00 | $98.00 |
On a typical 75/25 input-output mix, DeepSeek V4 Pro costs less (about 2% less than GLM-5.1). DeepSeek V4 Pro 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-pro", "messages": [{"role": "user", "content": "Hello"}]}'
# the other one: change the model string
-d '{"model": "z-ai/glm-5.1", ...}'Common questions
Which is cheaper, DeepSeek V4 Pro or GLM-5.1?
DeepSeek V4 Pro is cheaper on a typical mix of 75% input and 25% output tokens, by about 2%. Through Rapid Router both are billed at the provider list price per million tokens.
Which has the larger context window?
DeepSeek V4 Pro, at 1M tokens. GLM-5.1 offers 200K tokens.
Can I switch between DeepSeek V4 Pro and GLM-5.1 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-pro or z-ai/glm-5.1).
How do I pay for DeepSeek V4 Pro or GLM-5.1?
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