OpenAI compatible API · Attested · Public status

Z.ai: GLM 5.3 vs GLM 5.1

Z.ai: GLM 5.3 vs GLM 5.1: 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 has the lower cheapest prompt+completion route on TrustedRouter. Z.ai: GLM 5.3 has more provider fallback routes, while Z.ai: GLM 5.3 has the larger context window. Current TrustedRouter probes show Z.ai: GLM 5.3 with the lower p50 TTFT.

$4.2833/1MZ.ai: GLM 5.3 cheapest route

$6.119/1MGLM 5.1 cheapest route

666 msZ.ai: GLM 5.3 fastest measured p50 TTFT via parasail

5292 msGLM 5.1 fastest measured p50 TTFT via nebius

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.

Z.ai: GLM 5.3GLM 5.1

Model idz-ai/glm-5.3zai-org/GLM-5.1

Publisher Z.AI Nebius Token Factory

AI IQ IQ 123#19 IQ 114#43

Context1,048,576 tokens204,800 tokens

Credits provider routes221

Cheapest route$4.2833/1M$6.119/1M

Cached input$0.1266/1M to $1.02546/1MNot published

Privacy posturehas provider E2EE routehas ZDR route

Fastest measured p50 TTFT666 ms via parasail5292 ms via nebius

Highest measured throughputnot enough datanot enough data

Recent route uptime range0.00% to 100.00%100.00%

Modes chat chat

Z.ai: GLM 5.3 routes

Overview22 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

GLM 5.1 routes

Overview1 Credits routes

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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="z-ai/glm-5.3",
    messages=messages,
)

Questions

Which should I use, Z.ai: GLM 5.3 or GLM 5.1?

Is Z.ai: GLM 5.3 or GLM 5.1 cheaper?

The current cheapest TrustedRouter route is $4.2833/1M for Z.ai: GLM 5.3 and $6.119/1M for GLM 5.1. The comparison uses current catalog prices and updates as provider pricing changes.

Is Z.ai: GLM 5.3 or GLM 5.1 faster?

Current measured p50 time to first token is 666 ms for Z.ai: GLM 5.3 and 5292 ms for GLM 5.1. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test Z.ai: GLM 5.3 and GLM 5.1 with the same API?

Yes. Use the same OpenAI-compatible TrustedRouter base URL and API key, then change only the model id between z-ai/glm-5.3 and zai-org/GLM-5.1. This makes side-by-side evals possible without maintaining two provider integrations.