Claude Opus 4.5 vs Nemotron 3 Ultra 550B A55B
Wins 5 of 7 areas
Coding · Agents · Reasoning · Facts · Math
Wins 1 of 7 areas
Following instructions
Claude Opus 4.5 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 software62Claude Opus 4.56 of 8 tests
- ReasoningHard problems that need careful thinking30Claude Opus 4.53 of 4 tests · 1 tie
- MathCompetition and research-level math21Claude Opus 4.52 of 4 tests · 1 tie
- AgentsCarrying out multi-step tasks on its own21Claude Opus 4.52 of 3 tests
- FactsGetting facts right instead of making them up21Claude Opus 4.52 of 3 tests
- Following instructionsDoing exactly what it is asked03Nemotron 3 Ultra 550B A55B3 of 3 tests
- Long documentsFinding answers in very long texts11Even1 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 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 4.5 pulls ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+24points ahead
- Real work tasks from 44 professionsGDPVal+21.6points ahead
- Multi-step tasks using many real software toolsMCP Atlas+17.6points ahead
Where Nemotron 3 Ultra 550B A55B pulls ahead
- Fixes real GitHub issues in many programming languagesSWE-bench Multilingual+60.7points ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+31.3points ahead
- Follows unfamiliar, precisely checkable instructionsIFBench+23.4points 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 4.5
- SWE-bench MultilingualNemotron 3 Ultra 550B A55B by 60.7767.7+60.7
- Terminal-Bench HardClaude Opus 4.5 by 10.64736.4+10.6
- SWE-bench VerifiedClaude Opus 4.5 by 10.280.970.7+10.2
- SciCodeClaude Opus 4.5 by 9.249.540.3+9.2
- LiveBench · CodingClaude Opus 4.5 by 979.770.7+9
- LiveCodeBench v6Nemotron 3 Ultra 550B A55B by 4.284.889+4.2
- SWE-bench ProClaude Opus 4.5 by 2.35249.7+2.3
- LiveBench · Agentic CodingClaude Opus 4.5 by 139.738.7+1
AgentsClaude Opus 4.5
- GDPValClaude Opus 4.5 by 21.647.325.7+21.6
- MCP AtlasClaude Opus 4.5 by 17.662.344.7+17.6
- BrowseCompNemotron 3 Ultra 550B A55B by 7.43744.4+7.4
ReasoningClaude Opus 4.5
- LiveBench · ReasoningClaude Opus 4.5 by 5.480.174.7+5.4
- Humanity's Last ExamClaude Opus 4.5 by 1.730.128.4+1.7
- CritPtClaude Opus 4.5 by 1.54.63.1+1.5
- GPQA Diamondtie86.686.7tie
FactsClaude Opus 4.5
- AA-Omniscience · Non-hallucinationNemotron 3 Ultra 550B A55B by 31.33970.3+31.3
- AA-Omniscience · AccuracyClaude Opus 4.5 by 2446.622.6+24
- SimpleQA VerifiedClaude Opus 4.5 by 13.345.732.4+13.3
MathClaude Opus 4.5
- IMOAnswerBenchNemotron 3 Ultra 550B A55B by 8.38492.3+8.3
- HMMT Feb. 2026Claude Opus 4.5 by 6.585.378.8+6.5
- LiveBench · MathematicsClaude Opus 4.5 by 1.790.488.7+1.7
- AIME 2026tie95.194.2tie
Long documentsEven
- LongBench v2Claude Opus 4.5 by 2.564.461.9+2.5
- AA-LCRNemotron 3 Ultra 550B A55B by 277.379.3+2
Following instructionsNemotron 3 Ultra 550B A55B
- IFBenchNemotron 3 Ultra 550B A55B by 23.45881.4+23.4
- LiveBench · Instruction FollowingNemotron 3 Ultra 550B A55B by 10.962.573.5+10.9
- Multi-ChallengeNemotron 3 Ultra 550B A55B by 4.85963.8+4.8
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.
- AA Agentic IndexClaude Opus 4.5 by 37.959.621.7+37.9
- livebench_data_analysisClaude Opus 4.5 by 19.974.454.5+19.9
- AA-OmniscienceClaude Opus 4.5 by 14.414-0.4+14.4
- livebench_languageClaude Opus 4.5 by 10.581.370.8+10.5
- AA IntelligenceClaude Opus 4.5 by 6.229.122.9+6.2
- τ²-Bench Telecom (AA run)Claude Opus 4.5 by 6.289.583.3+6.2
- HLE (with tools)Claude Opus 4.5 by 5.843.237.4+5.8
- BrowseComp (context management)Nemotron 3 Ultra 550B A55B by 5.257.863+5.2
- MMLU-ProClaude Opus 4.5 by 2.789.586.8+2.7
- Artificial Analysis Coding IndexNemotron 3 Ultra 550B A55B by 1.547.849.3+1.5
- Finance AgentClaude Opus 4.5 by 1.555.253.7+1.5
Questions people ask
Which is better, Claude Opus 4.5 or Nemotron 3 Ultra 550B A55B?
Claude Opus 4.5 wins five of the seven areas where both have results: coding, agents, reasoning, facts and math. Nemotron 3 Ultra 550B A55B wins following instructions, and costs 90% less. They are level on long documents.
Which is better for coding?
Claude Opus 4.5. It wins 6 of the 8 coding tests both models report; Nemotron 3 Ultra 550B A55B wins 2.
Which is cheaper?
Claude Opus 4.5 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.