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Claude Sonnet 4.5 vs Nemotron 3 Ultra 550B A55B

Anthropic · released

Wins 1 of 7 areas

Coding

NVIDIA · released

Wins 6 of 7 areas

Agents · Reasoning · Facts · Math · Long documents · Following instructions

Nemotron 3 Ultra 550B A55B is the stronger all-rounder.Claude Sonnet 4.5 is better at coding.

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.

Math 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.

Claude Sonnet 4.5$3.00 to read · $15.00 to write$18Price from Anthropic's own price page
Nemotron 3 Ultra 550B A55B$0.60 to read · $2.70 to write$3.30Price from Artificial Analysis

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 Nemotron 3 Ultra 550B A55B pulls ahead

  • Olympiad math problems with short answersIMOAnswerBench+26.5points aheadNemotron 3 Ultra 550B A55B92.3Claude Sonnet 4.565.8
  • Recent programming contest problemsLiveCodeBench v6+25points aheadNemotron 3 Ultra 550B A55B89Claude Sonnet 4.564
  • Finds hard-to-locate facts by browsing the webBrowseComp+24.8points aheadNemotron 3 Ultra 550B A55B44.4Claude Sonnet 4.519.6

Where Claude Sonnet 4.5 pulls ahead

  • Common-sense trick questionsSimpleBench+12.6points aheadClaude Sonnet 4.554.3Nemotron 3 Ultra 550B A55B41.7
  • Customer-service tasks in a simulated bankτ-Bench V3 · Banking+10.3points aheadClaude Sonnet 4.524.5Nemotron 3 Ultra 550B A55B14.2
  • Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+10.3points aheadClaude Sonnet 4.532.9Nemotron 3 Ultra 550B A55B22.6

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 Sonnet 4.5

Full coding ranking

AgentsNemotron 3 Ultra 550B A55B

Full agents ranking

ReasoningNemotron 3 Ultra 550B A55B

Full reasoning ranking

FactsNemotron 3 Ultra 550B A55B

Full facts ranking

MathNemotron 3 Ultra 550B A55B

Full math ranking

Long documentsNemotron 3 Ultra 550B A55B

Full long documents ranking

Following instructionsNemotron 3 Ultra 550B A55B
  • IFBenchNemotron 3 Ultra 550B A55B by 24.157.381.4+24.1
  • Multi-ChallengeNemotron 3 Ultra 550B A55B by 8.555.363.8+8.5

Full following instructions ranking

Other results8 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.

Questions people ask

Which is better, Claude Sonnet 4.5 or Nemotron 3 Ultra 550B A55B?

Nemotron 3 Ultra 550B A55B wins six of the seven areas where both have results: agents, reasoning, facts, math, long documents and following instructions. Claude Sonnet 4.5 wins coding.

Which is better for coding?

Claude Sonnet 4.5. It wins 3 of the 7 coding tests both models report; Nemotron 3 Ultra 550B A55B wins 2, and 2 are ties.

Which is cheaper?

Claude Sonnet 4.5 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 32 benchmark tests both models have published scores on. The verdict counts the 24 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 8 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.

Compare Claude Sonnet 4.5 with

Anthropic

Across the field

Compare Nemotron 3 Ultra 550B A55B with

All comparisons