Kimi K3 API
Kimi K3 is Kimi's 2.8T-parameter open-source flagship with a 1M-token context and native visual understanding. The official page describes Kimi Delta Attention and Attention Residuals, full weight release, and positioning for long-horizon coding, knowledge work and reasoning.
Official source: model page · verified 2026-10-22
Pricing
Prices can change with upstream providers; the rate at settlement is authoritative.
Call the API
Use the OpenAI-compatible endpoint; no model-specific SDK setup is required.
curl https://api.kimiseek.app/v1/chat/completions \
-H "Authorization: Bearer $KIMISEEK_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "kimi/kimi-k3",
"messages": [{"role": "user", "content": "Hello from KimiSeek"}]
}'Where it fits
Best for
- Long-horizon coding and repository work
- Long-context knowledge synthesis
- Teams that need an open-weight frontier model
Tradeoffs
- Premium positioning and serving requirements
- Use a smaller model for short chat and bulk extraction
Model details
FAQ
Is Kimi K3 open source?
Yes. The official Kimi page states that the full model weights have been released.
What is its context window?
1M tokens, with native visual understanding according to the official quickstart.
How do I call this model?
Use KimiSeek's OpenAI-compatible API and set the model field to kimi/kimi-k3 with your KimiSeek API key.