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DeepSeek: DeepSeek V4.1 Flash vs Z.ai: GLM 4.5 Air

Try both on us. Starter credit covers your first requests, then one key routes DeepSeek V4.1 Flash and GLM 4.5 Air. 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

DeepSeek V4.1 Flash has the lower published input-plus-output rate, more Credits provider routes and the larger context window. There is not enough recent probe data to compare speed.

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

$1.153468/1MZ.ai: GLM 4.5 Air cheapest route

957 msDeepSeek: DeepSeek V4.1 Flash fastest measured p50 TTFT via together

not enough dataZ.ai: GLM 4.5 Air fastest measured p50 TTFT

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 4.5 Air

Model iddeepseek/deepseek-v4.1-flashz-ai/glm-4.5-air

Publisher DeepSeek Z.AI

AI IQ IQ 126#22 —

Context1,048,576 tokens131,072 tokens

Credits provider routes241

Cheapest route$0.1266/1M$1.153468/1M

Cached input$0.01/1M to $0.1899/1M$0.082643/1M

Privacy posturehas Confidential route (E2EE + ZDR)provider posture varies

Fastest measured p50 TTFT957 ms via togethernot enough data

Highest measured throughputnot enough datanot enough data

Recent route uptime range98.56% to 100.00%not enough data

Modes chat decide chat

DeepSeek: DeepSeek V4.1 Flash routes

Overview24 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

Z.ai: GLM 4.5 Air routes

Overview1 Credits routes

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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 4.5 Air?

DeepSeek V4.1 Flash has the lower published input-plus-output rate, more Credits provider routes and the larger context window. There is not enough recent probe data to compare speed.

Is DeepSeek: DeepSeek V4.1 Flash or Z.ai: GLM 4.5 Air cheaper?

The current cheapest TrustedRouter route is $0.1266/1M for DeepSeek: DeepSeek V4.1 Flash and $1.153468/1M for Z.ai: GLM 4.5 Air. The comparison uses current catalog prices and updates as provider pricing changes.

Is DeepSeek: DeepSeek V4.1 Flash or Z.ai: GLM 4.5 Air faster?

Current measured p50 time to first token is 957 ms for DeepSeek: DeepSeek V4.1 Flash and not enough data for Z.ai: GLM 4.5 Air. 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 4.5 Air 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-4.5-air. This makes side-by-side evals possible without maintaining two provider integrations.