OpenAI compatible API · Attested · Public status

DeepSeek V4 Flash 0731 Fast vs Z.ai: GLM 5.1

DeepSeek V4 Flash 0731 Fast 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

Monthly evidence

DeepSeek V4 Flash 0731 Fast has the lower cheapest prompt+completion route on TrustedRouter. Z.ai: GLM 5.1 has more provider fallback routes, while DeepSeek V4 Flash 0731 Fast has the larger context window. Current TrustedRouter probes show DeepSeek V4 Flash 0731 Fast with the lower p50 TTFT.

$0.36925/1MDeepSeek V4 Flash 0731 Fast cheapest route

$4.2833/1MZ.ai: GLM 5.1 cheapest route

1145 msDeepSeek V4 Flash 0731 Fast fastest measured p50 TTFT via wafer

1938 msZ.ai: GLM 5.1 fastest measured p50 TTFT via telnyx

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 V4 Flash 0731 FastZ.ai: GLM 5.1

Model iddeepseek/deepseek-v4-flash-0731-fastz-ai/glm-5.1

Publisher DeepSeek Z.AI

AI IQ — IQ 114#43

Context1,000,000 tokens200,000 tokens

Credits provider routes215

Cheapest route$0.36925/1M$4.2833/1M

Cached input$0.05275/1M to $0.092313/1M$0.10339/1M to $0.643403/1M

Privacy posturehas ZDR routehas provider E2EE route

Fastest measured p50 TTFT1145 ms via wafer1938 ms via telnyx

Highest measured throughputnot enough datanot enough data

Recent route uptime range100.00%0.00% to 100.00%

Modes chat chat

DeepSeek V4 Flash 0731 Fast routes

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

Z.ai: GLM 5.1 routes

Overview15 Credits routes
PricingInput, cached input, and output 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="deepseek/deepseek-v4-flash-0731-fast",
    messages=messages,
)

Questions

Which should I use, DeepSeek V4 Flash 0731 Fast or Z.ai: GLM 5.1?

Is DeepSeek V4 Flash 0731 Fast or Z.ai: GLM 5.1 cheaper?

The current cheapest TrustedRouter route is $0.36925/1M for DeepSeek V4 Flash 0731 Fast and $4.2833/1M for Z.ai: GLM 5.1. The comparison uses current catalog prices and updates as provider pricing changes.

Is DeepSeek V4 Flash 0731 Fast or Z.ai: GLM 5.1 faster?

Current measured p50 time to first token is 1145 ms for DeepSeek V4 Flash 0731 Fast and 1938 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 DeepSeek V4 Flash 0731 Fast 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 deepseek/deepseek-v4-flash-0731-fast and z-ai/glm-5.1. This makes side-by-side evals possible without maintaining two provider integrations.