Kimi K3 vs Nemotron 3 Ultra 550B A55B
Wins 6 of 7 areas
Coding · Agents · Reasoning · Facts · Math · Long documents
Wins 1 of 7 areas
Following instructions
Kimi K3 is the stronger all-rounder.Nemotron 3 Ultra 550B A55B is cheaper and better at following instructions.
Scores updated · 31 tests both models report · How we compare
Where each one wins
Tests won in each of the seven 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.
- AgentsCarrying out multi-step tasks on its own50Kimi K35 of 5 tests
- ReasoningHard problems that need careful thinking50Kimi K35 of 5 tests
- CodingWriting and fixing software40Kimi K34 of 4 tests
- FactsGetting facts right instead of making them up21Kimi K32 of 3 tests
- MathCompetition and research-level math21Kimi K32 of 3 tests
- Long documentsFinding answers in very long texts10Kimi K31 of 1 test
- Following instructionsDoing exactly what it is asked01Nemotron 3 Ultra 550B A55B1 of 1 test
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.
Nemotron 3 Ultra 550B A55B costs 82% less for the same work.
The biggest differences
The three tests each model wins by the widest margin. Scores are out of 100.
Where Kimi K3 pulls ahead
- Finds hard-to-locate facts by browsing the webBrowseComp+46.8points ahead
- Multi-step tasks using many real software toolsMCP Atlas+39.5points ahead
- Customer-service tasks in a simulated bankτ-Bench V3 · Banking+31.8points ahead
Where Nemotron 3 Ultra 550B A55B pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+23.5points ahead
- Fresh competition math problemsLiveBench · Mathematics+4.3points ahead
- Follows detailed instructions exactlyLiveBench · Instruction Following+2.1points ahead
Every test, side by side
All 31 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingKimi K3
- Terminal-Bench 2.1Kimi K3 by 31.18553.9+31.1
- LiveBench · Agentic CodingKimi K3 by 23.562.238.7+23.5
- SciCodeKimi K3 by 19.259.540.3+19.2
- LiveBench · CodingKimi K3 by 10.881.570.7+10.8
AgentsKimi K3
- BrowseCompKimi K3 by 46.891.244.4+46.8
- MCP AtlasKimi K3 by 39.584.244.7+39.5
- τ-Bench V3 · BankingKimi K3 by 31.84614.2+31.8
- GDPValKimi K3 by 2651.725.7+26
- Terminal-Bench 4.0Kimi K3 by 12.112.60.5+12.1
ReasoningKimi K3
- CritPtKimi K3 by 20.323.43.1+20.3
- SimpleBenchKimi K3 by 1960.741.7+19
- Humanity's Last ExamKimi K3 by 18.546.928.4+18.5
- LiveBench · ReasoningKimi K3 by 1690.774.7+16
- GPQA DiamondKimi K3 by 6.893.586.7+6.8
FactsKimi K3
- AA-Omniscience · AccuracyKimi K3 by 2547.622.6+25
- AA-Omniscience · Non-hallucinationNemotron 3 Ultra 550B A55B by 23.546.870.3+23.5
- SimpleQA VerifiedKimi K3 by 18.250.632.4+18.2
MathKimi K3
- HMMT Feb. 2026Kimi K3 by 18.29778.8+18.2
- LiveBench · MathematicsNemotron 3 Ultra 550B A55B by 4.384.488.7+4.3
- AIME 2026Kimi K3 by 2.596.794.2+2.5
Following instructionsNemotron 3 Ultra 550B A55B
- LiveBench · Instruction FollowingNemotron 3 Ultra 550B A55B by 2.171.473.5+2.1
Other results9 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.
- GDPval-AA v2Kimi K3 by 534 rating points16821148+534 rating
- Toolathlon VerifiedKimi K3 by 42.276.534.3+42.2
- AA Agentic IndexKimi K3 by 28.950.621.7+28.9
- Artificial Analysis Coding IndexKimi K3 by 26.976.249.3+26.9
- livebench_data_analysisKimi K3 by 24.278.754.5+24.2
- HLE (with tools)Kimi K3 by 22.459.837.4+22.4
- AA IntelligenceKimi K3 by 20.743.622.9+20.7
- AA-OmniscienceKimi K3 by 20.119.7-0.4+20.1
- livebench_languageKimi K3 by 14.785.570.8+14.7
Questions people ask
Which is better, Kimi K3 or Nemotron 3 Ultra 550B A55B?
Kimi K3 wins six of the seven areas where both have results: coding, agents, reasoning, facts, math and long documents. Nemotron 3 Ultra 550B A55B wins following instructions, and costs 82% less.
Which is better for coding?
Kimi K3. It wins 4 of the 4 coding tests both models report; Nemotron 3 Ultra 550B A55B wins none.
Which is cheaper?
Kimi K3 costs $3.00 per million input tokens and $15.00 per million output tokens; Nemotron 3 Ultra 550B A55B costs $0.60 and $2.70. That makes Nemotron 3 Ultra 550B A55B about 82% cheaper for the same work.
How do you compare the two?
We use the 31 benchmark tests both models have published scores on. The verdict counts the 22 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 9 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.