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DeepSeek: R1 0528 vs Z.ai: GLM 5.3 Flash

Try both on us. Starter credit covers your first requests, then one key routes R1 0528 and GLM 5.3 Flash. Switch by changing the model name.

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 Flash has the lower published input-plus-output rate, more Credits provider routes, the larger context window and the lower measured p50 time to first token.

$2.79575/1MDeepSeek: R1 0528 cheapest route

$0.32705/1MZ.ai: GLM 5.3 Flash cheapest route

1672 msDeepSeek: R1 0528 fastest measured p50 TTFT via io-net

1003 msZ.ai: GLM 5.3 Flash fastest measured p50 TTFT via crusoe

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.

DeepSeek: R1 0528Z.ai: GLM 5.3 Flash

Model iddeepseek/deepseek-r1-0528z-ai/glm-5.3-flash

Publisher DeepSeek Z.AI

AI IQ — IQ 119#45

Context163,840 tokens1,048,576 tokens

Credits provider routes332

Cheapest route$2.79575/1M$0.32705/1M

Cached input$0.276235/1M to $0.36925/1M$0.015825/1M to $0.068575/1M

Privacy postureprovider posture varieshas Confidential route (E2EE + ZDR)

Fastest measured p50 TTFT1672 ms via io-net1003 ms via crusoe

Highest measured throughputnot enough datanot enough data

Recent route uptime range100.00%96.67% to 100.00%

Modes chat chat

DeepSeek: R1 0528 routes

Overview3 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

Z.ai: GLM 5.3 Flash routes

Overview32 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="deepseek/deepseek-r1-0528",
    messages=messages,
)

Questions

Which should I use, DeepSeek: R1 0528 or Z.ai: GLM 5.3 Flash?

Z.ai: GLM 5.3 Flash has the lower published input-plus-output rate, more Credits provider routes, the larger context window and the lower measured p50 time to first token.

Is DeepSeek: R1 0528 or Z.ai: GLM 5.3 Flash cheaper?

The current cheapest TrustedRouter route is $2.79575/1M for DeepSeek: R1 0528 and $0.32705/1M for Z.ai: GLM 5.3 Flash. The comparison uses current catalog prices and updates as provider pricing changes.

Is DeepSeek: R1 0528 or Z.ai: GLM 5.3 Flash faster?

Current measured p50 time to first token is 1672 ms for DeepSeek: R1 0528 and 1003 ms for Z.ai: GLM 5.3 Flash. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test DeepSeek: R1 0528 and Z.ai: GLM 5.3 Flash with the same API?

Yes. Use the same OpenAI-compatible TrustedRouter base URL and API key, then change only the model id between deepseek/deepseek-r1-0528 and z-ai/glm-5.3-flash. This makes side-by-side evals possible without maintaining two provider integrations.