OpenAI compatible API · Attested · Public status

DeepSeek: DeepSeek V4.1 Flash vs Z.ai: GLM 5.1

DeepSeek V4.1 Flash 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 V4.1 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.

$0.1266/1MDeepSeek: DeepSeek V4.1 Flash cheapest route

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

813 msDeepSeek: DeepSeek V4.1 Flash fastest measured p50 TTFT via pearl

933 msZ.ai: GLM 5.1 fastest measured p50 TTFT via io-net

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: DeepSeek V4.1 FlashZ.ai: GLM 5.1

Model iddeepseek/deepseek-v4.1-flashz-ai/glm-5.1

Publisher DeepSeek Z.AI

AI IQ IQ 124#22 IQ 113#55

Context1,048,576 tokens202,752 tokens

Credits provider routes1812

Cheapest route$0.1266/1M$4.2833/1M

Cached input$0.01/1M to $0.146118/1M$0.10339/1M to $0.686805/1M

Privacy posturehas provider E2EE routehas provider E2EE route

Fastest measured p50 TTFT813 ms via pearl933 ms via io-net

Highest measured throughputnot enough datanot enough data

Recent route uptime range0.00% to 100.00%0.00% to 100.00%

Modes chat decide chat

DeepSeek: DeepSeek V4.1 Flash routes

Overview18 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

Z.ai: GLM 5.1 routes

Overview12 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-v4.1-flash",
    messages=messages,
)

Questions

Which should I use, DeepSeek: DeepSeek V4.1 Flash or Z.ai: GLM 5.1?

DeepSeek V4.1 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: DeepSeek V4.1 Flash or Z.ai: GLM 5.1 cheaper?

The current cheapest TrustedRouter route is $0.1266/1M for DeepSeek: DeepSeek V4.1 Flash and $4.2833/1M for Z.ai: GLM 5.1. The comparison uses current catalog prices and updates as provider pricing changes.

Is DeepSeek: DeepSeek V4.1 Flash or Z.ai: GLM 5.1 faster?

Current measured p50 time to first token is 813 ms for DeepSeek: DeepSeek V4.1 Flash and 933 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: DeepSeek V4.1 Flash 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-v4.1-flash and z-ai/glm-5.1. This makes side-by-side evals possible without maintaining two provider integrations.