$ diff astra kimi-k3
Astra vs Kimi K3
Values come from Astra and Kimi K3, where each is cited to its source. This page states no benchmark result and ranks neither model — it puts two published specifications next to each other. Where a lab has not published a figure, the row says so rather than guessing.
OpenAIAstra
- context
- 1.1M
- weights
- closed
- $/M in
- $10
- $/M out
- $50
- context
- 1M
- weights
- open
- $/M in
- $3
- $/M out
- $15
What actually differs
- Context window
- Astra takes 1.1M against 1M — modestly more room in a single request.
- Input price
- Kimi K3 at $3/M against $10/M — 3.3× cheaper to feed. Standard rates: one of these labs also quotes a lower cached-input tier, which applies only when a prefix is reused — see the full spec below.
- Output price
- Kimi K3 at $15/M against $50/M — 3.3× cheaper to generate. Output dominates the bill on most agentic workloads, where the model writes far more than it reads.
- Weights
- Kimi K3 publishes weights (Modified MIT (commercial use permitted; weights publicly downloadable)); Astra is API-only. That decides self-hosting, air-gapped deployment and fine-tuning before any capability question does.
- Recency
- Astra shipped 49 days after Kimi K3 (2026-09-03 vs 2026-07-16).
Full spec
| Attribute | Astra | Kimi K3 |
|---|---|---|
| Developer | OpenAI | Moonshot AI |
| Released | 2026-09-03 | 2026-07-16 |
| Context window | 1,050,000 tokens (128,000 max output) | 1M tokens |
| Pricing | $10/M input · $50/M output | $0.30/M cache-hit input · $3.00/M cache-miss input · $15.00/M output |
| License | proprietary | Modified MIT (commercial use permitted; weights publicly downloadable) |
| Availability | ChatGPT Plus, Pro, Business, Enterprise · OpenAI API · AWS — staged, see below | Kimi Code, Kimi app, Kimi API; weights on Hugging Face (`moonshot-ai/kimi-k3`, released 2026-07-27) |