OpenAI compatible API · Attested · Public status

Z.ai: GLM 4.7 Flash vs Z.ai: GLM 5.1

Z.ai: GLM 4.7 Flash vs Z.ai: 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

Z.ai: GLM 4.7 Flash has the lower cheapest prompt+completion route on TrustedRouter. Z.ai: GLM 5.1 has more provider fallback routes, while Z.ai: GLM 5.1 has the larger context window. Current TrustedRouter probes show Z.ai: GLM 4.7 Flash with the lower p50 TTFT.

$0.483/1MZ.ai: GLM 4.7 Flash cheapest route

$4.263/1MZ.ai: GLM 5.1 cheapest route

639 msZ.ai: GLM 4.7 Flash fastest measured p50 TTFT via deepinfra

1249 msZ.ai: GLM 5.1 fastest measured p50 TTFT via digitalocean

Z.ai: GLM 4.7 FlashZ.ai: GLM 5.1

Model idz-ai/glm-4.7-flashz-ai/glm-5.1

Publisher Z.AI Z.AI

AI IQ — IQ 114#32

Context202,752 tokens204,800 tokens

Provider routes624

Cheapest route$0.483/1M$4.263/1M

Privacy posturehas ZDR routehas confidential-compute route

Fastest measured p50 TTFT639 ms via deepinfra1249 ms via digitalocean

Highest measured throughputnot enough datanot enough data

Recent route uptime range100.00%66.67% to 100.00%

Modes chat chat

Z.ai: GLM 4.7 Flash routes

Overview6 endpoints
PricingPrompt and completion rates
ProvidersAll serving providers

Z.ai: GLM 5.1 routes

Overview24 endpoints
PricingPrompt and completion rates
BenchmarksTrustedRouter and external sources
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="z-ai/glm-4.7-flash",
    messages=messages,
)

Questions

Which should I use, Z.ai: GLM 4.7 Flash or Z.ai: GLM 5.1?

Is Z.ai: GLM 4.7 Flash or Z.ai: GLM 5.1 cheaper?

The current cheapest TrustedRouter route is $0.483/1M for Z.ai: GLM 4.7 Flash and $4.263/1M for Z.ai: GLM 5.1. The comparison uses current catalog prices and updates as provider pricing changes.

Is Z.ai: GLM 4.7 Flash or Z.ai: GLM 5.1 faster?

Current measured p50 time to first token is 639 ms for Z.ai: GLM 4.7 Flash and 1249 ms for Z.ai: GLM 5.1. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test Z.ai: GLM 4.7 Flash and Z.ai: 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-4.7-flash and z-ai/glm-5.1. This makes side-by-side evals possible without maintaining two provider integrations.