GLM 5.3 Flash API

GLM 5.3 Flash is a large language model by Z.ai, available on the Venice API as z-ai-glm-5-3-flash. Private and end-to-end encrypted variants are available.GLM-5.3 Flash is a reasoning model designed for coding, sustained agentic work, and production workloads. It is suited for long-horizon software engineering, complex reasoning, and workflows that combine text with visual context.

GLM 5.3 Flash API pricing

Model ID	Variant	Privacy	Price
`z-ai-glm-5-3-flash`	Standard	Private	$0.15 input /$ 0.50 output per 1M tokens
`e2ee-glm-5-3-flash`	E2EE	End-to-end encrypted	$0.16 input /$ 0.54 output per 1M tokens

GLM 5.3 Flash specifications

Spec	Value
Provider	Z.ai
Released	Aug 21, 2026
Privacy	Private, End-to-end encrypted
Open weights	Yes
Context window	1M tokens
Max output	128K tokens
Reasoning effort	none, low, medium, high

How to use the GLM 5.3 Flash API

Send requests to POST https://api.venice.ai/api/v1/chat/completions with "model": "z-ai-glm-5-3-flash" and your API key.

curl https://api.venice.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $VENICE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "z-ai-glm-5-3-flash",
    "messages": [{ "role": "user", "content": "Explain TEE attestation in two sentences." }],
    "reasoning_effort": "high"
  }'

GLM 5.3 Flash API FAQ

How much does the GLM 5.3 Flash API cost?

0.15 per 1M input tokens and

0.50 per 1M output tokens, with cached input at

0.03 per 1M. The E2EE variant costs

0.16 input and $0.54 output. Prices are in USD and can be paid in DIEM at parity.

What is the GLM 5.3 Flash model ID?

Use z-ai-glm-5-3-flash as the model parameter. Other variants: e2ee-glm-5-3-flash (E2EE).

Is the GLM 5.3 Flash API private?

The Standard variant is private: requests run on infrastructure Venice controls with zero data retention, and prompts and outputs are never stored or used for training. The E2EE variant is end-to-end encrypted: prompts are encrypted on your device and decrypted only inside an attested hardware enclave, so neither Venice nor the GPU provider can read them.

What is the context window of GLM 5.3 Flash?

1M tokens of context, with up to 128K output tokens per response.

What does GLM 5.3 Flash support?

GLM 5.3 Flash supports function calling, structured outputs, reasoning, image input, web search and prompt caching. Reasoning effort is adjustable with reasoning_effort: none, low, medium and high (default high).

Which endpoint does the GLM 5.3 Flash API use?

Call POST /chat/completions. /responses (Alpha) is also supported.

Related models

GLM 4.7 Flash API: $0.06 input /$ 0.40 output per 1M tokens
Qwen 3.8 Flash API: $0.14 input /$ 0.49 output per 1M tokens
GPT-6 Luna API: $0.13 input /$ 0.63 output per 1M tokens
DeepSeek V4 Flash 0731 API: $0.17 input /$ 0.35 output per 1M tokens
MiMo-V2.6-Flash API: $0.17 input /$ 0.35 output per 1M tokens

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