What's free
Access to all Cerebras-hosted models
Rate limits
Officially published per-model: 5 RPM / 30,000 TPM / 1,000,000 TPH / 1,000,000 TPD (e.g. gpt-oss-120b, zai-glm-4.7, gemma-4-31b); limits vary by model
The catch
Free tier includes community support (Discord) only; paid Developer tier gives "10x higher" rate limits
Free models · sample
gpt-oss-120bzai-glm-4.7gemma-4-31bA sample of models reachable on the free tier — the live catalog changes. Pull the current set with GET https://api.cerebras.ai/v1/models.
Quickstart — chat completions
from openai import OpenAI
client = OpenAI(base_url="https://api.cerebras.ai/v1", api_key="<YOUR_FREE_API_KEY>")
resp = client.chat.completions.create(
model="gpt-oss-120b",
messages=[{"role": "user", "content": "Hello!"}],
)
print(resp.choices[0].message.content)…or with curl:
curl https://api.cerebras.ai/v1/chat/completions \
-H "Authorization: Bearer $API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"gpt-oss-120b","messages":[{"role":"user","content":"Hello!"}]}'