OpenAI compatible API · Attested · Public status

Google: Gemini 3.1 Pro Preview vs Z.ai: GLM 5.3 Flash

Google: Gemini 3.1 Pro Preview vs Z.ai: GLM 5.3 Flash: compare current API pricing, context, provider routes, privacy, p50 latency, and OpenAI-compatible access.

Verify gateway

Onebase URL to migrate

100sof models and routes

0prompt or output logs. Always.

Compare routesProviders, price, context, and policy posture in one view.

Use auto when uptime mattersKeep a primary model and let fallback handle provider failures.

Same API shapeUse the OpenAI client and set the model you want.

Practical read

Monthly evidence

Z.ai: GLM 5.3 Flash has the lower cheapest prompt+completion route on TrustedRouter. Z.ai: GLM 5.3 Flash has more provider fallback routes, while Google: Gemini 3.1 Pro Preview has the larger context window. Current TrustedRouter probes show Z.ai: GLM 5.3 Flash with the lower p50 TTFT.

$14.77/1MGoogle: Gemini 3.1 Pro Preview cheapest route

$0.32705/1MZ.ai: GLM 5.3 Flash cheapest route

2704 msGoogle: Gemini 3.1 Pro Preview fastest measured p50 TTFT via google-ai-studio

1284 msZ.ai: GLM 5.3 Flash fastest measured p50 TTFT via friendli

Prices and live route measurements can change. Use the monthly reports when you need a stable evidence window, then run a small task-specific eval before choosing a production default.

Google: Gemini 3.1 Pro PreviewZ.ai: GLM 5.3 Flash

Model idgoogle/gemini-3.1-pro-previewz-ai/glm-5.3-flash

Publisher Google AI Studio Z.AI

AI IQ IQ 127#11 IQ 121#24

Context1,048,576 tokens1,048,576 tokens

Credits provider routes420

Cheapest route$14.77/1M$0.32705/1M

Cached input$0.211/1M to $0.422/1M$0.015825/1M to $0.1055/1M

Privacy posturehas ZDR routehas provider E2EE route

Fastest measured p50 TTFT2704 ms via google-ai-studio1284 ms via friendli

Highest measured throughputnot enough datanot enough data

Recent route uptime range100.00%0.00% to 100.00%

Modes chat chat

Google: Gemini 3.1 Pro Preview routes

Overview4 Credits routes
PricingInput, cached input, and output rates
BenchmarksTrustedRouter and external sources
ProvidersAll serving providers

Z.ai: GLM 5.3 Flash routes

Overview20 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

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Production choice

Pick a default model. Keep fallback enabled.

TrustedRouter is useful when you know the model you want, but still need provider rollover, budget limits, usage records, and a prompt path you can verify.

OpenAI clientPython

client = OpenAI(
    base_url="https://api.trustedrouter.com/v1",
    api_key="sk-tr-v1-..."
)

response = client.chat.completions.create(
    model="google/gemini-3.1-pro-preview",
    messages=messages,
)

Questions

Which should I use, Google: Gemini 3.1 Pro Preview or Z.ai: GLM 5.3 Flash?

Is Google: Gemini 3.1 Pro Preview or Z.ai: GLM 5.3 Flash cheaper?

The current cheapest TrustedRouter route is $14.77/1M for Google: Gemini 3.1 Pro Preview and $0.32705/1M for Z.ai: GLM 5.3 Flash. The comparison uses current catalog prices and updates as provider pricing changes.

Is Google: Gemini 3.1 Pro Preview or Z.ai: GLM 5.3 Flash faster?

Current measured p50 time to first token is 2704 ms for Google: Gemini 3.1 Pro Preview and 1284 ms for Z.ai: GLM 5.3 Flash. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test Google: Gemini 3.1 Pro Preview and Z.ai: GLM 5.3 Flash with the same API?

Yes. Use the same OpenAI-compatible TrustedRouter base URL and API key, then change only the model id between google/gemini-3.1-pro-preview and z-ai/glm-5.3-flash. This makes side-by-side evals possible without maintaining two provider integrations.