GPT-6 Astra vs Kimi K2.6
Wins 7 of 8 areas
Coding · Agents · Reasoning · Facts · Images and charts · Math · Following instructions
Wins 0 of 8 areas
—
GPT-6 Astra is the stronger all-rounder.Kimi K2.6 is cheaper.
Scores updated · 36 tests both models report · How we compare
Where each one wins
Tests won in each of the eight areas we test. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.
- CodingWriting and fixing software50GPT-6 Astra5 of 5 tests
- AgentsCarrying out multi-step tasks on its own50GPT-6 Astra5 of 5 tests
- ReasoningHard problems that need careful thinking40GPT-6 Astra4 of 4 tests
- MathCompetition and research-level math30GPT-6 Astra3 of 3 tests
- FactsGetting facts right instead of making them up31GPT-6 Astra3 of 4 tests
- Images and chartsUnderstanding pictures, charts and video10GPT-6 Astra1 of 2 tests · 1 tie
- Following instructionsDoing exactly what it is asked10GPT-6 Astra1 of 1 test
- Long documentsFinding answers in very long texts00Even0 each · 1 tie
Long documents and following instructions 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 K2.6 costs 92% 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
- Extremely hard research-level math problemsFrontierMath Tier 4+72points ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+58.6points ahead
- Short factual questions, answered correctlySimpleQA Verified+40.7points ahead
Where Kimi K2.6 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+10.8points ahead
Every test, side by side
All 36 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 265 rating points17741509+265 rating
- Terminal-Bench 2.1GPT-6 Astra by 22.588.465.9+22.5
- LiveBench · Agentic CodingGPT-6 Astra by 10.457.346.9+10.4
- SciCodeGPT-6 Astra by 556.551.5+5
- LiveBench · CodingGPT-6 Astra by 1.880.478.6+1.8
AgentsGPT-6 Astra
- Terminal-Bench 4.0GPT-6 Astra by 58.659.10.5+58.6
- GDPValGPT-6 Astra by 26.753.626.9+26.7
- τ-Bench V3 · BankingGPT-6 Astra by 18.141.423.3+18.1
- AA IT-Bench SREGPT-6 Astra by 17.448.631.2+17.4
- BrowseCompGPT-6 Astra by 5.291.586.3+5.2
ReasoningGPT-6 Astra
- CritPtGPT-6 Astra by 23.731.78+23.7
- Humanity's Last ExamGPT-6 Astra by 17.254.737.5+17.2
- LiveBench · ReasoningGPT-6 Astra by 13.392.779.4+13.3
- GPQA DiamondGPT-6 Astra by 596.191.1+5
FactsGPT-6 Astra
- SimpleQA VerifiedGPT-6 Astra by 40.775.634.9+40.7
- AA-Omniscience · AccuracyGPT-6 Astra by 3062.632.6+30
- AA-Omniscience · Non-hallucinationKimi K2.6 by 10.848.759.5+10.8
- Vectara HHEM hallucination ratelower is betterGPT-6 Astra by 2.18.710.8+2.1
Images and chartsGPT-6 Astra
- MMMU-ProGPT-6 Astra by 7.586.979.4+7.5
- LMArena · Visiontie12801282tie
MathGPT-6 Astra
- FrontierMath Tier 4GPT-6 Astra by 7297.625.6+72
- FrontierMath Tiers 1-3 (v2)GPT-6 Astra by 36.593.757.2+36.5
- LiveBench · MathematicsGPT-6 Astra by 12.596.884.3+12.5
Following instructionsGPT-6 Astra
- LiveBench · Instruction FollowingGPT-6 Astra by 11.275.664.4+11.2
Other results11 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.
- HiL-Bench (Tools-allowed)GPT-6 Astra by 46.665.318.7+46.6
- AA-OmniscienceGPT-6 Astra by 38.143.45.3+38.1
- AA Agentic IndexGPT-6 Astra by 29.451.522.1+29.4
- AA IntelligenceGPT-6 Astra by 25.752.727+25.7
- livebench_data_analysisGPT-6 Astra by 17.98365.1+17.9
- Artificial Analysis Coding IndexGPT-6 Astra by 15.176.961.8+15.1
- livebench_languageGPT-6 Astra by 14.389.475.1+14.3
- HLE (with tools)GPT-6 Astra by 3.257.254+3.2
- vectara_avg_summary_lengthGPT-6 Astra by 31.8 rating points148.5116.7+31.8 rating
- vectara_factual_consistencyGPT-6 Astra by 2.191.389.2+2.1
- vectara_answer_ratetie10099.7tie
Questions people ask
Which is better, GPT-6 Astra or Kimi K2.6?
GPT-6 Astra wins seven of the eight areas we test: coding, agents, reasoning, facts, images and charts, math and following instructions. Kimi K2.6 wins none, but costs 92% less. They are level on long documents.
Which is better for coding?
GPT-6 Astra. It wins 5 of the 5 coding tests both models report; Kimi K2.6 wins none.
Which is cheaper?
GPT-6 Astra costs $10.00 per million input tokens and $50.00 per million output tokens; Kimi K2.6 costs $0.95 and $4.00. That makes Kimi K2.6 about 92% cheaper for the same work.
How do you compare the two?
We use the 36 benchmark tests both models have published scores on. The verdict counts the 25 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 11 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.