OpenAI compatible API · Attested · Public status

Z.ai: GLM 5.1 vs Anthropic: Claude Sonnet 5

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

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 Anthropic: Claude Sonnet 5 has the larger context window. Current TrustedRouter probes show Z.ai: GLM 5.1 with the lower p50 TTFT.

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

$12.6/1MAnthropic: Claude Sonnet 5 cheapest route

2732 msZ.ai: GLM 5.1 measured p50 TTFT

5307 msAnthropic: Claude Sonnet 5 measured p50 TTFT

Z.ai: GLM 5.1Anthropic: Claude Sonnet 5

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

PublisherZ.AIAnthropic

AI IQ IQ 114#32 IQ 125#12

Context204,800 tokens1,000,000 tokens

Provider routes232

Cheapest route$4.263/1M$12.6/1M

Privacy posturehas provider E2EE routeprovider posture varies

Modes chat chat messages

Z.ai: GLM 5.1 routes

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

Anthropic: Claude Sonnet 5 routes

Overview2 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,
)