OpenAI compatible API · Attested · Public status

DeepSeek: DeepSeek V4 Flash 0423 vs Z.ai: GLM 5.3 Flash

DeepSeek V4 Flash 0423 vs Z.ai: GLM 5.3 Flash: 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

DeepSeek: DeepSeek V4 Flash 0423 has the lower cheapest prompt+completion route on TrustedRouter. DeepSeek: DeepSeek V4 Flash 0423 has more provider fallback routes, while Z.ai: GLM 5.3 Flash has the larger context window. Current TrustedRouter probes show DeepSeek: DeepSeek V4 Flash 0423 with the lower p50 TTFT.

$0.28485/1MDeepSeek: DeepSeek V4 Flash 0423 cheapest route

$0.342875/1MZ.ai: GLM 5.3 Flash cheapest route

881 msDeepSeek: DeepSeek V4 Flash 0423 fastest measured p50 TTFT via tinfoil

6157 msZ.ai: GLM 5.3 Flash fastest measured p50 TTFT via zai

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: DeepSeek V4 Flash 0423Z.ai: GLM 5.3 Flash

Model iddeepseek/deepseek-v4-flashz-ai/glm-5.3-flash

Publisher DeepSeek Z.AI

AI IQ IQ 113#44 IQ 121#20

Context1,048,576 tokens1,310,720 tokens

Provider routes3126

Cheapest route$0.28485/1M$0.342875/1M

Privacy posturehas provider E2EE routehas ZDR route

Fastest measured p50 TTFT881 ms via tinfoil6157 ms via zai

Highest measured throughput150 tok/s via nebiusnot enough data

Recent route uptime range80.00% to 100.00%100.00%

Modes chat chat

DeepSeek: DeepSeek V4 Flash 0423 routes

Overview31 endpoints
PricingPrompt and completion rates
BenchmarksTrustedRouter and external sources
ProvidersAll serving providers

Z.ai: GLM 5.3 Flash routes

Overview26 endpoints
PricingPrompt and completion 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-v4-flash",
    messages=messages,
)

Questions

Which should I use, DeepSeek: DeepSeek V4 Flash 0423 or Z.ai: GLM 5.3 Flash?

Is DeepSeek: DeepSeek V4 Flash 0423 or Z.ai: GLM 5.3 Flash cheaper?

The current cheapest TrustedRouter route is $0.28485/1M for DeepSeek: DeepSeek V4 Flash 0423 and $0.342875/1M for Z.ai: GLM 5.3 Flash. The comparison uses current catalog prices and updates as provider pricing changes.

Is DeepSeek: DeepSeek V4 Flash 0423 or Z.ai: GLM 5.3 Flash faster?

Current measured p50 time to first token is 881 ms for DeepSeek: DeepSeek V4 Flash 0423 and 6157 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: DeepSeek V4 Flash 0423 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-v4-flash and z-ai/glm-5.3-flash. This makes side-by-side evals possible without maintaining two provider integrations.