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GLM 5.3 Flash API

  • 1.05MContext
  • 524KMax output
  • $0.10/ $0.45From, per 1M in / out
  • 6Providers
Providers
  • Morph
  • DeepInfra
  • Nebius
  • Novita AI
  • Inference.net
  • RunInfra

Pricing

ProviderInput / 1MCached / 1MOutput / 1M
MorphDefault$0.20$0.04$0.70
DeepInfra$0.15$0.03$0.50
Nebius$0.15$0.03$0.50
Novita AI$0.15$0.03$0.50
Inference.netLowest$0.10$0.03$0.45
RunInfra$0.11$0.03$0.45

USD, as of October 27, 2026. Live prices

Cost

WorkloadMorphInference.net
1,000 chat replies2K in, 500 out each$0.75$0.43
1,000 agent tasks50K in, 5K out each$13.50$7.25
Monthly batch job500M in, 50M out$135.00$72.50

Quickstart

OpenAI-compatible
curl https://api.routerplus.com/v1/chat/completions \
  -H "Authorization: Bearer $ROUTERPLUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "z-ai/glm-5.3-flash",
    "messages": [{ "role": "user", "content": "Hello" }]
  }'

FAQ

How much does the GLM 5.3 Flash API cost?

On RouterPlus, routing for GLM 5.3 Flash starts at Morph: $0.20 per million input tokens and $0.70 per million output tokens. The lowest listed prices are at Inference.net: $0.10 input and $0.45 output. Name a provider with provider.only and you pay its price. Prices as of October 27, 2026.

Which providers serve GLM 5.3 Flash?

6 providers serve GLM 5.3 Flash on RouterPlus: Morph, DeepInfra, Nebius, Novita AI, Inference.net and RunInfra. By default the router tries them in routing order and fails over before the first byte, never mid-answer.

What is the GLM 5.3 Flash model ID?

Use "z-ai/glm-5.3-flash" as the model with the OpenAI-compatible endpoint at https://api.routerplus.com/v1. The same key also accepts the Anthropic API format.

What is the GLM 5.3 Flash context window?

1.05M tokens of context and up to 524K output tokens, per the RouterPlus catalog. A provider can list a lower limit; the console shows each one.

Is GLM 5.3 Flash open weights?

Yes. Z.ai publishes GLM 5.3 Flash as an open-weight model, which is why several independent providers can host it.

Do any GLM 5.3 Flash providers retain prompts?

5 of 6 providers list no prompt retention (DeepInfra, Nebius, Novita AI, Inference.net and RunInfra). Morph may retain prompts. Pin the providers you accept with a routing policy.

Can I reserve capacity for GLM 5.3 Flash?

Yes. Tell us the model, the throughput you need and the region with "I need inference", and RouterPlus lines up reserved capacity for it.

Need GLM 5.3 Flash at volume?