WhichAI.todayGPT-6 Astra
OpenAI
Pick this when you already work in ChatGPT or Codex.
Skip it if you want to run completely offline without sending source code to proprietary servers.
LMArena Code 1764; 90.2% on SWE-bench Pro V2 HARD
GPT-6 Astra vs Kimi K3
Updated Nov 13, 2026. Checked daily.
The short answer
GPT-6 Astra ranks ahead for coding & software, reasoning, math & science. Kimi K3 ranks ahead for legal & long documents.
GPT-6 Astra
2 of 3 jobs ahead
Paid plan
Kimi K3
1 of 3 jobs ahead
Free (limited)
Head to head, job by job
Each job ranks a #1, an alternative, and an open-weights pick from public leaderboards. Bars compare the two scores on that job's own signal.
Which one should you pick?
Kimi K3
Moonshot AI
Pick this when the code cannot leave your own machines.
Skip self-hosting if you lack multi-GPU cluster infrastructure required to serve 2.8 trillion parameters.
88.2% on SWE-bench Pro V2 HARD
Price, access, and privacy
GPT-6 AstraKimi K3
Cost
Plus is $20/month; API is $10 per million input tokens and $50 per million output tokens.
Free to download weights; hosted Kimi app is free with usage limits or available via API.
Free tier
Not on the free plan. Plus includes access inside Work and Codex.
Yes, available for free with standard rate limits in the Kimi web and mobile apps.
Where to get it
Apps
- ChatGPT, Pro ($100/month)
- Perplexity, Max ($200/month)
- GitHub Copilot, Copilot Pro ($10/month)
- Codex, Plus ($20/month)
- Perplexity, Pro ($20/month)
- Cursor, Premium ($30/month)
- GitHub Copilot, Copilot Pro ($10/month)
- Hugging Face, Free (Free)
- Ollama, Pro ($20/month)
Trains on chats
Yes on personal Free, Plus, and Pro. Improve the model for everyone is on by default. Settings, Data controls, turn off Improve the model for everyone.
Yes. The Kimi consumer policy says prompts and files can be used to improve models. Ask Kimi support to stop training use if the app has no toggle.
Try both with the same prompt
GPT-6 Astra
Implement this feature in the repo, then list the files you changed and why.
Kimi K3
Refactor this module for clarity and add tests for the edge cases.
Want a sharper prompt? Build one for either model.
Questions
Is GPT-6 Astra or Kimi K3 better for coding & software?
GPT-6 Astra ranks ahead for coding & software on LMArena Code. GPT-6 Astra is the alternative pick (1764); Kimi K3 is the open weights pick.
Is GPT-6 Astra or Kimi K3 better for legal & long documents?
Kimi K3 ranks ahead for legal & long documents on Vals LegalBench. GPT-6 Astra is not in today's top three; Kimi K3 is the open weights pick (86.2).
Is GPT-6 Astra or Kimi K3 better for reasoning, math & science?
GPT-6 Astra ranks ahead for reasoning, math & science on Humanity's Last Exam. GPT-6 Astra is the alternative pick (57.2); Kimi K3 is not in today's top three.
Which is cheaper, GPT-6 Astra or Kimi K3?
GPT-6 Astra: Plus is $20/month; API is $10 per million input tokens and $50 per million output tokens. Kimi K3: Free to download weights; hosted Kimi app is free with usage limits or available via API.
Can I use GPT-6 Astra or Kimi K3 for free?
GPT-6 Astra: Not on the free plan. Plus includes access inside Work and Codex. Kimi K3: Yes, available for free with standard rate limits in the Kimi web and mobile apps.
Which is more private, GPT-6 Astra or Kimi K3?
GPT-6 Astra (OpenAI): Yes on personal Free, Plus, and Pro. Improve the model for everyone is on by default. Kimi K3 (Moonshot AI): Yes. The Kimi consumer policy says prompts and files can be used to improve models.