OpenAI compatible API. Attested gateway. Public status.

Z.ai: GLM 5.1 vs Google: Gemini 3.5 Flash

Compare Z.ai: GLM 5.1 and Google: Gemini 3.5 Flash by providers, context, price, and TrustedRouter route support.

Verify gateway
1 URLbase_url migration
100smodels and routes
0prompt logs by default
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 5.1 has the lower cheapest prompt+completion route on TrustedRouter. Z.ai: GLM 5.1 has more provider fallback routes, while Google: Gemini 3.5 Flash has the larger context window. Current TrustedRouter probes show Z.ai: GLM 5.1 with the lower p50 TTFT.

$4.62/1MZ.ai: GLM 5.1 cheapest route
$11.55/1MGoogle: Gemini 3.5 Flash cheapest route
3190 msZ.ai: GLM 5.1 measured p50 TTFT
3894 msGoogle: Gemini 3.5 Flash measured p50 TTFT
Z.ai: GLM 5.1Google: Gemini 3.5 Flash
Model idz-ai/glm-5.1google/gemini-3.5-flash
PublisherZ.AIGemini
AI IQ IQ 113#27 IQ 122#12
Context204,800 tokens1,048,576 tokens
Provider routes246
Cheapest route$4.62/1M$11.55/1M
Privacy posturehas provider E2EE routeprovider posture varies
Modes chat chat

Z.ai: GLM 5.1 routes

Google: Gemini 3.5 Flash routes

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,
)

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