GLM 5.3 Flash
z-ai/glm-5.3-flashGLM-5.3-Flash is the first native multimodal model in Z.ai's GLM-5 series, a 320B-parameter mixture-of-experts model with 18B active parameters that combines sparse and linear attention to cut long-context compute and KV cache. Vision is built into its coding loop, letting it inspect rendered interfaces and GUI feedback for frontend, game and computer-use work, and it also handles office documents and financial research. Z.ai reports it outperforms GLM-5.2; GLM-5.3-FlashX serves it at higher speed.
- Input price
- $0.11
$0.15USD / 1M tokens - Output price
- $0.38
$0.50USD / 1M tokens - Cache read
- $0.02
$0.03USD / 1M tokens - Context window
- 1M
- Max output
- 131.1K
Specifications
- Input
- Text, image
- Output
- Text
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OpenAI-compatible endpoint with unified authentication and usage tracking.
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/chat/completions" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "z-ai/glm-5.3-flash",
"messages": [
{
"role": "user",
"content": "Hello"
}
],
"max_tokens": 2048
}
SANDBASE_JSON
)
printf '%s\n' "$result"Questions
FAQ
How do I call Z.ai GLM 5.3 Flash through SandBase?
Create a SandBase API key, then send requests with the model ID "z-ai/glm-5.3-flash" to Chat Completions API (/v1/chat/completions) at https://api.sandbase.ai. The request examples on this page show the exact payload.
How much does Z.ai GLM 5.3 Flash cost?
$0.11 per 1M input tokens and $0.38 per 1M output tokens with the current 25% discount (list price $0.15 / $0.50), billed per request from your SandBase balance.
What is the context window of Z.ai GLM 5.3 Flash?
1M tokens of context, with up to 131.1K output tokens per response.
Which features does Z.ai GLM 5.3 Flash support?
Z.ai GLM 5.3 Flash supports vision (image input), reasoning, function calling, structured output. See Specifications above for the full list.
Do I need a separate Z.ai account?
No. One SandBase API key and balance gives you access to Z.ai GLM 5.3 Flash and the other models in the catalog; you do not need to sign up with Z.ai separately.