OpenAI compatible API · Attested · Public status

Z.ai: GLM 5.1 vs Google: Gemma 3 27B

Compare Z.ai: GLM 5.1 and Google: Gemma 3 27B by providers, context, price, and TrustedRouter route support.

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

Google: Gemma 3 27B has the lower cheapest prompt+completion route on TrustedRouter. Z.ai: GLM 5.1 has more provider fallback routes, while Google: Gemma 3 27B has the larger context window. Current TrustedRouter probes show Google: Gemma 3 27B with the lower p50 TTFT.

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

$0.252/1MGoogle: Gemma 3 27B cheapest route

2972 msZ.ai: GLM 5.1 measured p50 TTFT

1727 msGoogle: Gemma 3 27B measured p50 TTFT

Z.ai: GLM 5.1Google: Gemma 3 27B

Model idz-ai/glm-5.1google/gemma-3-27b-it

PublisherZ.AIGoogle AI Studio

AI IQ IQ 114#32 —

Context204,800 tokens262,144 tokens

Provider routes238

Cheapest route$4.263/1M$0.252/1M

Privacy posturehas provider E2EE routehas ZDR route

Modes chat chat

Z.ai: GLM 5.1 routes

Overview23 endpoints
PricingPrompt and completion rates
BenchmarksTrustedRouter and external sources
ProvidersAll serving providers

Google: Gemma 3 27B routes

Overview8 endpoints
PricingPrompt and completion rates
ProvidersAll serving providers

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-5.1",
    messages=messages,
)