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 K3.1 Pro
Updated Nov 13, 2026. Checked daily.
The short answer
GPT-6 Astra ranks ahead in every job we track where either appears (coding & software, reasoning, math & science).
GPT-6 Astra
2 of 2 jobs ahead
Paid plan
Kimi K3.1 Pro
0 of 2 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 K3.1 Pro
Moonshot AI
Pick this when the problem cannot leave your own machines.
Skip it if you lack multi-GPU cluster hardware to host massive parameter weights locally.
Humanity's Last Exam 52.5%.
Price, access, and privacy
GPT-6 AstraKimi K3.1 Pro
Cost
Plus is $20/month; API is $10 per million input tokens and $50 per million output tokens.
Weights are free to download. API is $2 per million input tokens and $10 per million output.
Free tier
Not on the free plan. Plus includes access inside Work and Codex.
The weights are free to download and run locally, and Kimi.ai offers limited free chat.
Where to get it
Apps
- ChatGPT, Pro ($100/month)
- Perplexity, Max ($200/month)
- GitHub Copilot, Copilot Pro ($10/month)
- Codex, Plus ($20/month)
- Hugging Face, Free (Free)
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 K3.1 Pro
Explain this concept with one example, then give me a harder practice problem.
Want a sharper prompt? Build one for either model.
Questions
Is GPT-6 Astra or Kimi K3.1 Pro better for coding & software?
GPT-6 Astra ranks ahead for coding & software on LMArena Code. GPT-6 Astra is the alternative pick (1764); Kimi K3.1 Pro is not in today's top three.
Is GPT-6 Astra or Kimi K3.1 Pro 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 K3.1 Pro is the open weights pick (52.5).
Which is cheaper, GPT-6 Astra or Kimi K3.1 Pro?
GPT-6 Astra: Plus is $20/month; API is $10 per million input tokens and $50 per million output tokens. Kimi K3.1 Pro: Weights are free to download. API is $2 per million input tokens and $10 per million output.
Can I use GPT-6 Astra or Kimi K3.1 Pro for free?
GPT-6 Astra: Not on the free plan. Plus includes access inside Work and Codex. Kimi K3.1 Pro: The weights are free to download and run locally, and Kimi.ai offers limited free chat.
Which is newer, GPT-6 Astra or Kimi K3.1 Pro?
Kimi K3.1 Pro was released on Oct 23, 2026, after GPT-6 Astra on Sep 3, 2026.
Which is more private, GPT-6 Astra or Kimi K3.1 Pro?
GPT-6 Astra (OpenAI): Yes on personal Free, Plus, and Pro. Improve the model for everyone is on by default. Kimi K3.1 Pro (Moonshot AI): Yes. The Kimi consumer policy says prompts and files can be used to improve models.