Overview
Models
The models Stac offers, the exact value to send as model, and which plans include each one.
Every request picks its model with the model field. Send one of the values
below exactly as written — your key's plan decides which ones you can use.
Text
Used by Chat completions and Messages.
| Model | model value | Plans |
|---|---|---|
| Qwen 3.5 9B | qwen/qwen3.5-9b | Go, Pro, Enterprise |
| GLM 5.3 Flash | z-ai/glm-5.3-flash | Go, Pro, Enterprise |
| Qwen 3.8 27B | qwen/qwen3.8-27b | Pro, Enterprise |
| Kimi K3 | moonshotai/kimi-k3 | Coming soon — not available on any plan yet |
Image
Used by the Image endpoints.
| Model | model value | Plans |
|---|---|---|
| Qwen 3 Image | qwen/qwen-image-3 | Go, Pro, Enterprise |
| FLUX.2 Klein 4B | black-forest-labs/flux.2-klein-4b | Go, Pro, Enterprise |
Example
bash
curl "https://api.trystac.com/v1/chat/completions" \
-H "Authorization: Bearer $STAC_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "qwen/qwen3.5-9b",
"messages": [{ "role": "user", "content": "Hello" }]
}'Models outside your plan
Requesting a model from the tables above that your key's plan doesn't include
returns 403. The same goes for a model marked as coming soon. Upgrade the
plan or switch to a model your plan includes — retrying won't help.
Tip
GET /v1/models returns exactly the models
your key can use. Call it to check a key, or to fill a model picker in your
own product.
Next steps
- List models — the endpoint behind the tip above.
- Pricing model — what each plan includes.
- Errors & rate limits — every status code.