OpenAI compatible API · Attested · Public status

grok-4.20-0309-reasoning vs Z.ai: GLM 5.3

grok-4.20-0309-reasoning vs Z.ai: GLM 5.3: 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

Monthly evidence

Z.ai: GLM 5.3 has the lower published input-plus-output rate and more Credits provider routes. There is not enough recent probe data to compare speed.

$3.95625/1Mgrok-4.20-0309-reasoning cheapest route

$3.896326/1MZ.ai: GLM 5.3 cheapest route

not enough datagrok-4.20-0309-reasoning fastest measured p50 TTFT

767 msZ.ai: GLM 5.3 fastest measured p50 TTFT via sail-research

The price comparison adds each route's rate for one million input tokens and one million output tokens; your cost depends on your input/output mix. Prices and live route measurements can change. Use the monthly reports when you need a stable evidence window, then run a small task-specific eval before choosing a production default.

grok-4.20-0309-reasoningZ.ai: GLM 5.3

Model idx-ai/grok-4.20-reasoningz-ai/glm-5.3

Publisher xAI Grok Z.AI

AI IQ — IQ 127#15

Context0 tokens1,048,576 tokens

Credits provider routes226

Cheapest route$3.95625/1M$3.896326/1M

Cached input$0.211/1M to $0.422/1M$0.1477/1M to $1.02546/1M

Privacy postureprovider posture varieshas provider E2EE route

Fastest measured p50 TTFTnot enough data767 ms via sail-research

Highest measured throughputnot enough datanot enough data

Recent route uptime range100.00%100.00%

Modes chat chat

grok-4.20-0309-reasoning routes

Overview2 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

Z.ai: GLM 5.3 routes

Overview26 Credits routes
PricingInput, cached input, and output rates
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="x-ai/grok-4.20-reasoning",
    messages=messages,
)

Questions

Which should I use, grok-4.20-0309-reasoning or Z.ai: GLM 5.3?

Z.ai: GLM 5.3 has the lower published input-plus-output rate and more Credits provider routes. There is not enough recent probe data to compare speed.

Is grok-4.20-0309-reasoning or Z.ai: GLM 5.3 cheaper?

The current cheapest TrustedRouter route is $3.95625/1M for grok-4.20-0309-reasoning and $3.896326/1M for Z.ai: GLM 5.3. The comparison uses current catalog prices and updates as provider pricing changes.

Is grok-4.20-0309-reasoning or Z.ai: GLM 5.3 faster?

Current measured p50 time to first token is not enough data for grok-4.20-0309-reasoning and 767 ms for Z.ai: GLM 5.3. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test grok-4.20-0309-reasoning and Z.ai: GLM 5.3 with the same API?

Yes. Use the same OpenAI-compatible TrustedRouter base URL and API key, then change only the model id between x-ai/grok-4.20-reasoning and z-ai/glm-5.3. This makes side-by-side evals possible without maintaining two provider integrations.