River

Models served by River

Model name

Model	Context	Input /M	Output /M	Cache read /M	TTFT	Throughput
GLM 5.3 Flash Unverified z-ai/glm-5.3-flash:river	1.0M	$0.126/M	$0.42/M	$0.0252/M	N/A	N/A

GLM 5.3 Flash

Unverified

z-ai/glm-5.3-flash:river

Context

1.0M

Input /M

$0.126/M

Output /M

$0.42/M

Cache read /M

$0.0252/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 River via the API

Call a model served by River 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:river",
    "messages": [{"role": "user", "content": "Hello"}]
  }'

For models with provider selection, append :river to the model ID, set "provider": "river" in the request body, or send an X-Provider: river 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.