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Model comparison

GLM-5.3-Flash vs Grok Build 0.1

GLM-5.3-Flash (Z.ai) and Grok Build 0.1 (xAI) 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.

GLM-5.3-FlashGrok Build 0.1
Input price per 1M$0.012$1.00
Output price per 1M$0.900$2.00
Context window1M tokens256K tokens
Max output131K tokens256K tokens
Input typestext, image, video, pdftext, image, pdf
Capabilitiestools, JSON, vision, reasoningtools, JSON, vision, reasoning
AuthorZ.aixAI

What a month costs on each

WorkloadGLM-5.3-FlashGrok Build 0.1
Chatbot month (15M in, 4M out)$3.78$23.00
RAG month (40M in, 3M out)$3.18$46.00
Coding month (60M in, 10M out)$9.72$80.00

On a typical 75/25 input-output mix, GLM-5.3-Flash costs less (about 81% less than Grok Build 0.1). GLM-5.3-Flash 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": "z-ai/glm-5.3-flash", "messages": [{"role": "user", "content": "Hello"}]}'

# the other one: change the model string
  -d '{"model": "x-ai/grok-build-0.1", ...}'

Common questions

Which is cheaper, GLM-5.3-Flash or Grok Build 0.1?

GLM-5.3-Flash is cheaper on a typical mix of 75% input and 25% output tokens, by about 81%. Through Rapid Router both are billed at the provider list price per million tokens.

Which has the larger context window?

GLM-5.3-Flash, at 1M tokens. Grok Build 0.1 offers 256K tokens.

Can I switch between GLM-5.3-Flash and Grok Build 0.1 without changing code?

Yes. Both are callable at https://rapidrouter.ai/api/v1 with the same OpenAI-compatible request; only the model string changes (z-ai/glm-5.3-flash or x-ai/grok-build-0.1).

How do I pay for GLM-5.3-Flash or Grok Build 0.1?

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

More GLM models: Z.ai API pricing · More Grok: xAI API pricing