OpenAI compatible API · Attested · Public status

OpenAI: o3 Mini vs Z.ai: GLM 5.1

o3 Mini vs Z.ai: GLM 5.1: compare current API pricing, context, provider routes, privacy, p50 latency, and OpenAI-compatible access.

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 Z.ai: GLM 5.1 has the larger context window. Probe-backed speed data is shown when enough recent samples exist.

$5.775/1MOpenAI: o3 Mini cheapest route

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

not enough dataOpenAI: o3 Mini fastest measured p50 TTFT

664 msZ.ai: GLM 5.1 fastest measured p50 TTFT via wafer

OpenAI: o3 MiniZ.ai: GLM 5.1

Model idopenai/o3-miniz-ai/glm-5.1

Publisher OpenAI Z.AI

AI IQ — IQ 114#32

Context200,000 tokens204,800 tokens

Provider routes224

Cheapest route$5.775/1M$4.263/1M

Privacy posturehas ZDR routehas confidential-compute route

Fastest measured p50 TTFTnot enough data664 ms via wafer

Highest measured throughputnot enough datanot enough data

Recent route uptime range100.00%75.00% to 100.00%

Modes chat chat

OpenAI: o3 Mini routes

Overview2 endpoints
PricingPrompt and completion rates
ProvidersAll serving providers

Z.ai: GLM 5.1 routes

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

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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="openai/o3-mini",
    messages=messages,
)

Questions

Which should I use, OpenAI: o3 Mini or Z.ai: GLM 5.1?

Is OpenAI: o3 Mini or Z.ai: GLM 5.1 cheaper?

The current cheapest TrustedRouter route is $5.775/1M for OpenAI: o3 Mini and $4.263/1M for Z.ai: GLM 5.1. The comparison uses current catalog prices and updates as provider pricing changes.

Is OpenAI: o3 Mini or Z.ai: GLM 5.1 faster?

Current measured p50 time to first token is not enough data for OpenAI: o3 Mini and 664 ms for Z.ai: GLM 5.1. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test OpenAI: o3 Mini and Z.ai: GLM 5.1 with the same API?

Yes. Use the same OpenAI-compatible TrustedRouter base URL and API key, then change only the model id between openai/o3-mini and z-ai/glm-5.1. This makes side-by-side evals possible without maintaining two provider integrations.