OpenAI compatible API. Attested gateway. Public status.

Z.ai: GLM 5.1 vs Claude Sonnet 5

Compare Z.ai: GLM 5.1 and Claude Sonnet 5 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 Claude Sonnet 5 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

$13.2/1MClaude Sonnet 5 cheapest route

3190 msZ.ai: GLM 5.1 measured p50 TTFT

3905 msClaude Sonnet 5 measured p50 TTFT

Z.ai: GLM 5.1Claude Sonnet 5

Model idz-ai/glm-5.1anthropic/claude-sonnet-5

PublisherZ.AIAnthropic

AI IQ IQ 113#27 IQ 126#8

Context204,800 tokens1,048,576 tokens

Provider routes242

Cheapest route$4.62/1M$13.2/1M

Privacy posturehas provider E2EE routeprovider posture varies

Modes chat chat

Z.ai: GLM 5.1 routes

Overview24 endpoints
PricingPrompt and completion rates
BenchmarksTrustedRouter and external sources
ProvidersAll serving providers

Claude Sonnet 5 routes

Overview2 endpoints
PricingPrompt and completion rates
BenchmarksTrustedRouter and external sources
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,
)