OpenAI compatible API · Attested · Public status

Z.ai: GLM 5 vs OpenAI: GPT-4o

Compare Z.ai: GLM 5 and OpenAI: GPT-4o 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 has the lower cheapest prompt+completion route on TrustedRouter. Z.ai: GLM 5 has more provider fallback routes, while Z.ai: GLM 5 has the larger context window. Current TrustedRouter probes show OpenAI: GPT-4o with the lower p50 TTFT.

$2.814/1MZ.ai: GLM 5 cheapest route

$13.125/1MOpenAI: GPT-4o cheapest route

2412 msZ.ai: GLM 5 measured p50 TTFT

1841 msOpenAI: GPT-4o measured p50 TTFT

Z.ai: GLM 5OpenAI: GPT-4o

Model idz-ai/glm-5openai/gpt-4o

PublisherZ.AIOpenAI

AI IQ IQ 106#50 IQ #

Context204,800 tokens128,000 tokens

Provider routes185

Cheapest route$2.814/1M$13.125/1M

Privacy posturehas provider E2EE routeprovider posture varies

Modes chat chat

Z.ai: GLM 5 routes

Overview18 endpoints
PricingPrompt and completion rates
BenchmarksTrustedRouter and external sources
ProvidersAll serving providers

OpenAI: GPT-4o routes

Overview5 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",
    messages=messages,
)