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
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

Anthropic: Claude Sonnet 5 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,
)
Workspace access

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