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Model comparison

Gemma 3 4B IT vs GLM-5.3-Flash

Gemma 3 4B IT (Google) 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.

Gemma 3 4B ITGLM-5.3-Flash
Input price per 1M$0.050$0.012
Output price per 1M$0.100$0.900
Context window131K tokens1M tokens
Max output16K tokens131K tokens
Input typestext, imagetext, image, video, pdf
CapabilitiesJSON, visiontools, JSON, vision, reasoning
AuthorGoogleZ.ai

What a month costs on each

WorkloadGemma 3 4B ITGLM-5.3-Flash
Chatbot month (15M in, 4M out)$1.15$3.78
RAG month (40M in, 3M out)$2.30$3.18
Coding month (60M in, 10M out)$4.00$9.72

On a typical 75/25 input-output mix, Gemma 3 4B IT costs less (about 73% less than GLM-5.3-Flash). 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": "google/gemma-3-4b-it:free", "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, Gemma 3 4B IT or GLM-5.3-Flash?

Gemma 3 4B IT is cheaper on a typical mix of 75% input and 25% output tokens, by about 73%. 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. Gemma 3 4B IT offers 131K tokens.

Can I switch between Gemma 3 4B IT 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 (google/gemma-3-4b-it:free or z-ai/glm-5.3-flash).

How do I pay for Gemma 3 4B IT 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 Gemini models: Google API pricing · More GLM: Z.ai API pricing