Nemotron 3 Ultra 550B A55B vs Claude Opus 5
Wins 1 of 7 areas
Following instructions
Wins 5 of 7 areas
Coding · Agents · Reasoning · Facts · Math
Claude Opus 5 is the stronger all-rounder.Nemotron 3 Ultra 550B A55B is cheaper and better at following instructions.
Scores updated · 32 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 software07Claude Opus 57 of 7 tests
- AgentsCarrying out multi-step tasks on its own05Claude Opus 55 of 5 tests
- ReasoningHard problems that need careful thinking05Claude Opus 55 of 5 tests
- FactsGetting facts right instead of making them up12Claude Opus 52 of 3 tests
- MathCompetition and research-level math01Claude Opus 51 of 1 test
- Following instructionsDoing exactly what it is asked10Nemotron 3 Ultra 550B A55B1 of 1 test
- Long documentsFinding answers in very long texts00Even0 each · 1 tie
Math, 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 89% 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 Claude Opus 5 pulls ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+48.5points ahead
- Finds hard-to-locate facts by browsing the webBrowseComp+46.4points ahead
- Multi-step tasks using many real software toolsMCP Atlas+41.1points ahead
Where Nemotron 3 Ultra 550B A55B pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+31.1points ahead
- Follows detailed instructions exactlyLiveBench · Instruction Following+9.7points ahead
Every test, side by side
All 32 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Opus 5
- Terminal-Bench 2.1Claude Opus 5 by 35.253.989.1+35.2
- SWE-bench ProClaude Opus 5 by 29.549.779.2+29.5
- LiveBench · Agentic CodingClaude Opus 5 by 26.538.765.2+26.5
- SWE-bench VerifiedClaude Opus 5 by 25.370.796+25.3
- SWE-bench MultilingualClaude Opus 5 by 21.867.789.5+21.8
- SciCodeClaude Opus 5 by 16.140.356.4+16.1
- LiveBench · CodingClaude Opus 5 by 10.870.781.5+10.8
AgentsClaude Opus 5
- Terminal-Bench 4.0Claude Opus 5 by 48.50.549+48.5
- BrowseCompClaude Opus 5 by 46.444.490.8+46.4
- MCP AtlasClaude Opus 5 by 41.144.785.8+41.1
- GDPValClaude Opus 5 by 35.425.761.1+35.4
- τ-Bench V3 · BankingClaude Opus 5 by 27.914.242.1+27.9
ReasoningClaude Opus 5
- SimpleBenchClaude Opus 5 by 38.941.780.6+38.9
- Humanity's Last ExamClaude Opus 5 by 26.528.454.9+26.5
- CritPtClaude Opus 5 by 263.129.1+26
- LiveBench · ReasoningClaude Opus 5 by 16.574.791.2+16.5
- GPQA DiamondClaude Opus 5 by 6.586.793.2+6.5
FactsClaude Opus 5
- AA-Omniscience · AccuracyClaude Opus 5 by 38.322.660.9+38.3
- AA-Omniscience · Non-hallucinationNemotron 3 Ultra 550B A55B by 31.170.339.2+31.1
- SimpleQA VerifiedClaude Opus 5 by 27.532.459.9+27.5
Following instructionsNemotron 3 Ultra 550B A55B
- LiveBench · Instruction FollowingNemotron 3 Ultra 550B A55B by 9.773.563.8+9.7
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 v2Claude Opus 5 by 676 rating points11481824+676 rating
- Toolathlon VerifiedClaude Opus 5 by 46.334.380.6+46.3
- AA-OmniscienceClaude Opus 5 by 37.5-0.437.1+37.5
- AA Agentic IndexClaude Opus 5 by 34.521.756.2+34.5
- Artificial Analysis Coding IndexClaude Opus 5 by 28.749.378+28.7
- AA IntelligenceClaude Opus 5 by 27.922.950.8+27.9
- HLE (with tools)Claude Opus 5 by 26.237.463.6+26.2
- livebench_data_analysisClaude Opus 5 by 20.154.574.5+20.1
- livebench_languageClaude Opus 5 by 17.970.888.7+17.9
Questions people ask
Which is better, Nemotron 3 Ultra 550B A55B or Claude Opus 5?
Claude Opus 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 89% less. They are level on long documents.
Which is better for coding?
Claude Opus 5. It wins 7 of the 7 coding tests both models report; Nemotron 3 Ultra 550B A55B wins none.
Which is cheaper?
Nemotron 3 Ultra 550B A55B costs $0.60 per million input tokens and $2.70 per million output tokens; Claude Opus 5 costs $5.00 and $25.00. That makes Nemotron 3 Ultra 550B A55B about 89% cheaper for the same work.
How do you compare the two?
We use the 32 benchmark tests both models have published scores on. The verdict counts the 23 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.