Comparing 2 models
Kimi K3 vs GPT-6 Astra
Benchmarks through
Verdict
GPT-6 Astra places higher on 4 of the 6 tasks where both are ranked. Kimi K3 costs 32.9x less per input token. GPT-6 Astra accepts 1.0x more context. Only Kimi K3 has open weights for self-hosting.
- Choose Kimi K3 for JSON & Schema Output (#4), Structured Data Extraction (#4), you need to self-host.
- Choose GPT-6 Astra for Debugging & Code Review (#4), Agentic Coding (#5), Autonomous Agents (#5).
Built from the published task rankings below; ranks come from each task's own weighted benchmarks, so a win on one task says nothing about another.
Measured head to head
Benchmarks both models were run on
| Evaluation | Kimi K3 | GPT-6 Astra | Source |
|---|---|---|---|
| FrontierMath Tiers 1-3 (Epoch AI) | 72.2% ± 2.7 | 93.7% ± 1.4 | source · 2026-07-17 |
| GPQA Diamond (Epoch AI) | 91.9% ± 1.9 | 95.8% ± 1.4 | source · 2026-08-07 |
| GPQA Diamond (Epoch AI) | 93.1% ± 1.5 | 95.8% ± 1.4 | source · 2026-07-16 |
| LiveBench Agentic Coding | 62.2% | 57.3% | source · 2026-10-16 |
| LiveBench Coding | 81.5% | 80.4% | source · 2026-10-16 |
| LiveBench Data Analysis | 78.7% | 83.0% | source · 2026-10-16 |
| LiveBench Instruction Following | 71.4% | 75.6% | source · 2026-10-16 |
| LiveBench Language | 85.5% | 89.4% | source · 2026-10-16 |
| LiveBench Math | 84.4% | 96.8% | source · 2026-10-16 |
| LiveBench Reasoning | 90.7% | 92.7% | source · 2026-10-16 |
| LMArena Agent | 1.9 | 13.7 | source · 2026-10-14 |
| LMArena Agent Bash Recovery | 4.4 | 5.5 | source · 2026-10-08 |
| LMArena Agent Steerability | 0.5 | 14.6 | source · 2026-10-14 |
| LMArena Agent Task Outcome | 6.3 | 12.5 | source · 2026-10-14 |
| LMArena Agent Tool Hallucination | 0.6 | 0.6 | source · 2026-10-14 |
| LMArena Creative Writing | 1456 Elo | 1421 Elo | source · 2026-10-15 |
| LMArena Instruction Following | 1483 Elo | 1455 Elo | source · 2026-10-15 |
| LMArena Long Query | 1493 Elo | 1461 Elo | source · 2026-10-15 |
| LMArena Math | 1494 Elo | 1465 Elo | source · 2026-10-15 |
| LMArena Text | 1487 Elo | 1477 Elo | source · 2026-10-15 |
| LMArena Text Factuality | 1471 Elo | 1466 Elo | source · 2026-10-15 |
| LMArena WebDev | 1655 Elo | 1780 Elo | source · 2026-10-13 |
| LMArena WebDev Image-to-Web | 1579 Elo | 1731 Elo | source · 2026-10-09 |
| OTIS Mock AIME (Epoch AI) | 93.3% ± 3.8 | 100% ± 0 | source · 2026-08-07 |
| OTIS Mock AIME (Epoch AI) | 97.2% ± 1.1 | 100% ± 0 | source · 2026-07-16 |
| SimpleQA Verified (Epoch AI) | 50.6% ± 1.6 | 75.6% ± 1.4 | source · 2026-08-27 |
Values are as published by each evaluator, in its own units; rows from different evaluators are not on a common scale.
task evidence
How they place when the question changes
Lower ranks are better. “Best” marks the strongest option in this shortlist for that task.