OpenAI compatible API · Attested · Public status

Z.ai: GLM 5.2 vs OpenAI: GPT-5.5

Compare Z.ai: GLM 5.2 and OpenAI: GPT-5.5 by providers, context, price, and TrustedRouter route support.

Verify gateway

Onebase URL to migrate

100sof models and routes

Noneprompt 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 5.2 has the lower cheapest prompt+completion route on TrustedRouter. Z.ai: GLM 5.2 has more provider fallback routes, while OpenAI: GPT-5.5 has the larger context window. Probe-backed speed data is shown when enough recent samples exist.

$2.07942/1MZ.ai: GLM 5.2 cheapest route

$36.75/1MOpenAI: GPT-5.5 cheapest route

1832 msZ.ai: GLM 5.2 measured p50 TTFT

not enough dataOpenAI: GPT-5.5 measured p50 TTFT

Z.ai: GLM 5.2OpenAI: GPT-5.5

Model idz-ai/glm-5.2openai/gpt-5.5

PublisherZ.AIOpenAI

AI IQ IQ 120#16 IQ 132#3

Context1,048,576 tokens1,050,000 tokens

Provider routes394

Cheapest route$2.07942/1M$36.75/1M

Privacy posturehas provider E2EE routeprovider posture varies

Modes chat chat

Z.ai: GLM 5.2 routes

Overview39 endpoints
PricingPrompt and completion rates
BenchmarksTrustedRouter and external sources
ProvidersAll serving providers

OpenAI: GPT-5.5 routes

Overview4 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-5.2",
    messages=messages,
)