GPT-6 Astra wins more areas, narrowly.Kimi K3.1 Pro is cheaper and better at images and charts.
Scores updated · 21 tests both models report · How we compare
Where each one wins
Tests won in each of the four areas where both have results. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.
Coding, agents and images and charts rest on a single test each.
What it costs
Prices per million tokens, roughly 750,000 words. The bars show the cost of a million tokens read plus a million written.
Kimi K3.1 Pro costs 80% less for the same work.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where GPT-6 Astra pulls ahead
- Very hard expert questions across many subjectsHumanity's Last Exam+3.6points ahead
- Graduate-level biology, physics and chemistry questionsGPQA Diamond+1.9points ahead
Where Kimi K3.1 Pro pulls ahead
- Harder college exam questions with imagesMMMU-Pro+3.1points ahead
Every test, side by side
All 21 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGPT-6 Astra
- LMArena · WebDevGPT-6 Astra by 78 rating points17731695+78 rating
ReasoningGPT-6 Astra
- Humanity's Last ExamGPT-6 Astra by 3.654.751.1+3.6
- GPQA DiamondGPT-6 Astra by 1.996.194.2+1.9
Other results16 tests, not counted
Tests outside the eight areas. They are not counted above: several are summary scores built from other tests, or the same test under another name.
- Terminal-Bench-Science 0.1GPT-6 Astra by 26.564.638.1+26.5
- Program BenchGPT-6 Astra by 18.55031.5+18.5
- Agents' Last ExamGPT-6 Astra by 16.159.343.2+16.1
- HLE (with tools)Kimi K3.1 Pro by 12.857.270+12.8
- SWE Marathon v1.1Kimi K3.1 Pro by 9.242.551.7+9.2
- Terminal-Bench 4.0Kimi K3.1 Pro by 857.765.7+8
- PostTrainBenchGPT-6 Astra by 7.844.336.5+7.8
- AA IntelligenceGPT-6 Astra by 6.752.746+6.7
- PostTrain Bench v1.2GPT-6 Astra by 5.441.936.5+5.4
- ZeroBench_main w/ python (pass@5)Kimi K3.1 Pro by 55863+5
- BenchCAD w/ toolsGPT-6 Astra by 3.295.992.7+3.2
- mmmu_pro_with_pythonKimi K3.1 Pro by 2.287.890+2.2
- DeepSWE 1.1Kimi K3.1 Pro by 1.474.175.5+1.4
- baby_vision_with_pythonGPT-6 Astra by 1.296.695.4+1.2
- ChartoGraphy w/ pythontie9190.2tie
- charxiv_rq_with_pythontie92.893.4tie
Questions people ask
Which is better, GPT-6 Astra or Kimi K3.1 Pro?
GPT-6 Astra wins two of the four areas where both have results: coding and reasoning. Kimi K3.1 Pro wins images and charts, and costs 80% less. They are level on agents.
Which is better for coding?
GPT-6 Astra. It wins the one coding test both models report.
Which is cheaper?
GPT-6 Astra costs $10.00 per million input tokens and $50.00 per million output tokens; Kimi K3.1 Pro costs $2.00 and $10.00. That makes Kimi K3.1 Pro about 80% cheaper for the same work.
How do you compare the two?
We use the 21 benchmark tests both models have published scores on. The verdict counts the 5 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 16 are listed but not counted, because several are summary scores or repeat a test. Each score is the one shown on the model's own page.