OpenAI compatible API · Attested · Public status

Google: Gemini 2.5 Pro vs Z.ai: GLM 5.3 Flash

Z.ai: GLM 5.3 Flash has the lower published input-plus-output rate, more Credits provider routes and the lower measured p50 time to first token. Their context windows are the same size. Compare price, speed, context, and privacy.

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 published input-plus-output rate, more Credits provider routes and the lower measured p50 time to first token. Their context windows are the same size.

$11.86875/1MGoogle: Gemini 2.5 Pro cheapest route

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

2415 msGoogle: Gemini 2.5 Pro fastest measured p50 TTFT via google-vertex

432 msZ.ai: GLM 5.3 Flash fastest measured p50 TTFT via crusoe

The price comparison adds each route's rate for one million input tokens and one million output tokens; your cost depends on your input/output mix. 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 2.5 ProZ.ai: GLM 5.3 Flash

Model idgoogle/gemini-2.5-proz-ai/glm-5.3-flash

Publisher Google AI Studio Z.AI

AI IQ IQ 99#121 IQ 120#42

Context1,048,576 tokens1,048,576 tokens

Credits provider routes333

Cheapest route$11.86875/1M$0.32705/1M

Cached input$0.131875/1M to $0.26375/1M$0.015825/1M to $0.076488/1M

Privacy posturehas ZDR routehas Confidential route (E2EE + ZDR)

Fastest measured p50 TTFT2415 ms via google-vertex432 ms via crusoe

Highest measured throughputnot enough datanot enough data

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

Modes chat chat

Google: Gemini 2.5 Pro routes

Overview3 Credits routes
PricingInput, cached input, and output rates
BenchmarksTrustedRouter and external sources
ProvidersAll serving providers

Z.ai: GLM 5.3 Flash routes

Overview33 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-2.5-pro",
    messages=messages,
)

Questions

Which should I use, Google: Gemini 2.5 Pro or Z.ai: GLM 5.3 Flash?

Z.ai: GLM 5.3 Flash has the lower published input-plus-output rate, more Credits provider routes and the lower measured p50 time to first token. Their context windows are the same size.

Is Google: Gemini 2.5 Pro or Z.ai: GLM 5.3 Flash cheaper?

The current cheapest TrustedRouter route is $11.86875/1M for Google: Gemini 2.5 Pro 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 2.5 Pro or Z.ai: GLM 5.3 Flash faster?

Current measured p50 time to first token is 2415 ms for Google: Gemini 2.5 Pro and 432 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 2.5 Pro 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-2.5-pro and z-ai/glm-5.3-flash. This makes side-by-side evals possible without maintaining two provider integrations.