Claude Opus 4.6 vs Nemotron 3 Ultra 550B A55B
Wins 5 of 7 areas
Coding · Agents · Reasoning · Facts · Math
Wins 2 of 7 areas
Long documents · Following instructions
Claude Opus 4.6 is the stronger all-rounder.Nemotron 3 Ultra 550B A55B is cheaper and better at following instructions.
Scores updated · 38 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.
- CodingWriting and fixing software70Claude Opus 4.67 of 8 tests · 1 tie
- ReasoningHard problems that need careful thinking50Claude Opus 4.65 of 5 tests
- AgentsCarrying out multi-step tasks on its own30Claude Opus 4.63 of 3 tests
- MathCompetition and research-level math21Claude Opus 4.62 of 4 tests · 1 tie
- FactsGetting facts right instead of making them up21Claude Opus 4.62 of 3 tests
- Following instructionsDoing exactly what it is asked03Nemotron 3 Ultra 550B A55B3 of 3 tests
- Long documentsFinding answers in very long texts01Nemotron 3 Ultra 550B A55B1 of 1 test
Long documents rests on a single test.
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 90% less for the same work.
The biggest differences
The three tests each model wins by the widest margin. Scores are out of 100.
Where Claude Opus 4.6 pulls ahead
- Finds hard-to-locate facts by browsing the webBrowseComp+39.6points ahead
- Real work tasks from 44 professionsGDPVal+30.2points ahead
- Common-sense trick questionsSimpleBench+25.9points ahead
Where Nemotron 3 Ultra 550B A55B pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+33.1points ahead
- Follows unfamiliar, precisely checkable instructionsIFBench+28.3points ahead
- Keeps track of context across a multi-turn chatMulti-Challenge+26.6points ahead
Every test, side by side
All 38 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Opus 4.6
- SciCodeClaude Opus 4.6 by 11.651.940.3+11.6
- LiveBench · Agentic CodingClaude Opus 4.6 by 10.34938.7+10.3
- SWE-bench MultilingualClaude Opus 4.6 by 10.177.867.7+10.1
- SWE-bench VerifiedClaude Opus 4.6 by 10.180.870.7+10.1
- Terminal-Bench HardClaude Opus 4.6 by 9.846.236.4+9.8
- LiveBench · CodingClaude Opus 4.6 by 7.578.270.7+7.5
- SWE-bench ProClaude Opus 4.6 by 3.753.449.7+3.7
- LiveCodeBench v6tie88.889tie
AgentsClaude Opus 4.6
- BrowseCompClaude Opus 4.6 by 39.68444.4+39.6
- GDPValClaude Opus 4.6 by 30.255.925.7+30.2
- MCP AtlasClaude Opus 4.6 by 1862.744.7+18
ReasoningClaude Opus 4.6
- SimpleBenchClaude Opus 4.6 by 25.967.641.7+25.9
- LiveBench · ReasoningClaude Opus 4.6 by 1488.774.7+14
- Humanity's Last ExamClaude Opus 4.6 by 11.539.928.4+11.5
- CritPtClaude Opus 4.6 by 9.512.63.1+9.5
- GPQA DiamondClaude Opus 4.6 by 2.989.686.7+2.9
FactsClaude Opus 4.6
- AA-Omniscience · Non-hallucinationNemotron 3 Ultra 550B A55B by 33.137.270.3+33.1
- AA-Omniscience · AccuracyClaude Opus 4.6 by 24.44722.6+24.4
- SimpleQA VerifiedClaude Opus 4.6 by 14.64732.4+14.6
MathClaude Opus 4.6
- HMMT Feb. 2026Claude Opus 4.6 by 17.496.278.8+17.4
- IMOAnswerBenchNemotron 3 Ultra 550B A55B by 1775.392.3+17
- AIME 2026Claude Opus 4.6 by 2.596.794.2+2.5
- LiveBench · Mathematicstie89.388.7tie
Long documentsNemotron 3 Ultra 550B A55B
- AA-LCRNemotron 3 Ultra 550B A55B by 1.37879.3+1.3
Following instructionsNemotron 3 Ultra 550B A55B
- IFBenchNemotron 3 Ultra 550B A55B by 28.353.181.4+28.3
- Multi-ChallengeNemotron 3 Ultra 550B A55B by 26.637.163.8+26.6
- LiveBench · Instruction FollowingNemotron 3 Ultra 550B A55B by 10.263.373.5+10.2
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.
- Apex (Pass@1)Nemotron 3 Ultra 550B A55B by 50.334.584.8+50.3
- AA Agentic IndexClaude Opus 4.6 by 45.967.621.7+45.9
- HLE (with tools)Claude Opus 4.6 by 15.953.337.4+15.9
- livebench_data_analysisClaude Opus 4.6 by 15.469.954.5+15.4
- AA-OmniscienceClaude Opus 4.6 by 14.113.7-0.4+14.1
- livebench_languageClaude Opus 4.6 by 12.583.370.8+12.5
- AA IntelligenceClaude Opus 4.6 by 931.922.9+9
- τ²-Bench Telecom (AA run)Claude Opus 4.6 by 8.892.183.3+8.8
- Finance AgentClaude Opus 4.6 by 760.753.7+7
- MMLU-ProClaude Opus 4.6 by 2.389.186.8+2.3
- Artificial Analysis Coding IndexNemotron 3 Ultra 550B A55B by 1.248.149.3+1.2
Questions people ask
Which is better, Claude Opus 4.6 or Nemotron 3 Ultra 550B A55B?
Claude Opus 4.6 wins five of the seven areas where both have results: coding, agents, reasoning, facts and math. Nemotron 3 Ultra 550B A55B wins long documents and following instructions, and costs 90% less.
Which is better for coding?
Claude Opus 4.6. It wins 7 of the 8 coding tests both models report; Nemotron 3 Ultra 550B A55B wins none, and 1 is a tie.
Which is cheaper?
Claude Opus 4.6 costs $5.00 per million input tokens and $25.00 per million output tokens; Nemotron 3 Ultra 550B A55B costs $0.60 and $2.50. That makes Nemotron 3 Ultra 550B A55B about 90% cheaper for the same work.
How do you compare the two?
We use the 38 benchmark tests both models have published scores on. The verdict counts the 27 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.