Astorias

Astorias publishes zero retention and no training for inference prompts and outputs, with legal, abuse, and security exceptions. Account, billing, and operational metadata may be retained. Automatic prompt caching is supported; cross-request cache hits have been observed, but the published request-only KV lifetime wording does not establish a cache retention period. Inference location has not been verified.

Models served by Astorias

Model name

Model	Context	Input /M	Output /M	Cache read /M	TTFT	Throughput
GLM 5.3 Flash NVFP4 ZDR z-ai/glm-5.3-flash:astorias	1.0M	$0.0525/M	$0.21/M	$0.0315/M	N/A	N/A
GLM 5.3 Flash Uncensored NVFP4 ZDR z-ai/glm-5.3-flash-uncensored:astorias	1.0M	$0.105/M	$0.42/M	$0.0315/M	N/A	N/A
Qwen3.8 27B FP8 ZDR qwen3.8-27b:astorias	262k	$0.105/M	$1.68/M	$0.0525/M	N/A	N/A
Qwen3.8 27B Thinking FP8 ZDR qwen3.8-27b:thinking:astorias	262k	$0.105/M	$1.68/M	$0.0525/M	N/A	N/A

GLM 5.3 Flash

NVFP4

ZDR

z-ai/glm-5.3-flash:astorias

Context

1.0M

Input /M

$0.0525/M

Output /M

$0.21/M

Cache read /M

$0.0315/M

TTFT

N/A

Throughput

N/A

GLM 5.3 Flash Uncensored

NVFP4

ZDR

z-ai/glm-5.3-flash-uncensored:astorias

Context

1.0M

Input /M

$0.105/M

Output /M

$0.42/M

Cache read /M

$0.0315/M

TTFT

N/A

Throughput

N/A

Qwen3.8 27B

FP8

ZDR

qwen3.8-27b:astorias

Context

262k

Input /M

$0.105/M

Output /M

$1.68/M

Cache read /M

$0.0525/M

TTFT

N/A

Throughput

N/A

Qwen3.8 27B Thinking

FP8

ZDR

qwen3.8-27b:thinking:astorias

Context

262k

Input /M

$0.105/M

Output /M

$1.68/M

Cache read /M

$0.0525/M

TTFT

N/A

Throughput

N/A

Prices are per million tokens. TTFT is the observed time to first token. Selectable routes include the applicable provider-selection markup; fixed routes show the standard model price. Availability and pricing refresh continuously; each model page shows the live provider comparison.

Using Astorias via the API

Call a model served by Astorias using its displayed model ID, including the provider suffix when selection is supported.

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

For models with provider selection, append :astorias to the model ID, set "provider": "astorias" in the request body, or send an X-Provider: astorias header. Explicit provider selection adds a route-specific markup over that provider's base price; the prices in the table above already include it. Models without provider selection use the displayed model ID without a provider suffix or selection surcharge.

See the API documentation for provider preferences, price-aware routing, and error behavior.