GPT-6 Astra vs Nemotron 3 Ultra 550B A55B
Wins 7 of 7 areas
Coding · Agents · Reasoning · Facts · Math · Long documents · Following instructions
Wins 0 of 7 areas
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GPT-6 Astra is the stronger all-rounder.Nemotron 3 Ultra 550B A55B is cheaper.
Scores updated · 30 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.
- ReasoningHard problems that need careful thinking50GPT-6 Astra5 of 5 tests
- CodingWriting and fixing software40GPT-6 Astra4 of 4 tests
- AgentsCarrying out multi-step tasks on its own40GPT-6 Astra4 of 4 tests
- FactsGetting facts right instead of making them up21GPT-6 Astra2 of 3 tests
- MathCompetition and research-level math10GPT-6 Astra1 of 1 test
- Long documentsFinding answers in very long texts10GPT-6 Astra1 of 1 test
- Following instructionsDoing exactly what it is asked10GPT-6 Astra1 of 1 test
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 95% 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 GPT-6 Astra pulls ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+58.6points ahead
- Finds hard-to-locate facts by browsing the webBrowseComp+47.1points ahead
- Short factual questions, answered correctlySimpleQA Verified+43.2points ahead
Where Nemotron 3 Ultra 550B A55B pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+21.6points ahead
Every test, side by side
All 30 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGPT-6 Astra
- Terminal-Bench 2.1GPT-6 Astra by 34.588.453.9+34.5
- LiveBench · Agentic CodingGPT-6 Astra by 18.657.338.7+18.6
- SciCodeGPT-6 Astra by 16.256.540.3+16.2
- LiveBench · CodingGPT-6 Astra by 9.780.470.7+9.7
AgentsGPT-6 Astra
- Terminal-Bench 4.0GPT-6 Astra by 58.659.10.5+58.6
- BrowseCompGPT-6 Astra by 47.191.544.4+47.1
- GDPValGPT-6 Astra by 27.953.625.7+27.9
- τ-Bench V3 · BankingGPT-6 Astra by 27.241.414.2+27.2
ReasoningGPT-6 Astra
- SimpleBenchGPT-6 Astra by 41.983.641.7+41.9
- CritPtGPT-6 Astra by 28.631.73.1+28.6
- Humanity's Last ExamGPT-6 Astra by 26.354.728.4+26.3
- LiveBench · ReasoningGPT-6 Astra by 1892.774.7+18
- GPQA DiamondGPT-6 Astra by 9.496.186.7+9.4
FactsGPT-6 Astra
- SimpleQA VerifiedGPT-6 Astra by 43.275.632.4+43.2
- AA-Omniscience · AccuracyGPT-6 Astra by 4062.622.6+40
- AA-Omniscience · Non-hallucinationNemotron 3 Ultra 550B A55B by 21.648.770.3+21.6
Following instructionsGPT-6 Astra
- LiveBench · Instruction FollowingGPT-6 Astra by 2.175.673.5+2.1
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.
- Terminal-Bench-Science 0.1GPT-6 Astra by 63.363.30+63.3
- CritPt v2 HardGPT-6 Astra by 55.570.515+55.5
- HLE-DiamondGPT-6 Astra by 55.363.88.5+55.3
- AA-OmniscienceGPT-6 Astra by 43.843.4-0.4+43.8
- AA Agentic IndexGPT-6 Astra by 29.851.521.7+29.8
- AA IntelligenceGPT-6 Astra by 29.852.722.9+29.8
- livebench_data_analysisGPT-6 Astra by 28.58354.5+28.5
- Artificial Analysis Coding IndexGPT-6 Astra by 27.676.949.3+27.6
- GDP (Surge AI)GPT-6 Astra by 26315+26
- HLE (with tools)GPT-6 Astra by 19.857.237.4+19.8
- livebench_languageGPT-6 Astra by 18.689.470.8+18.6
Questions people ask
Which is better, GPT-6 Astra or Nemotron 3 Ultra 550B A55B?
GPT-6 Astra wins all seven areas where both have results: coding, agents, reasoning, facts, math, long documents and following instructions. Nemotron 3 Ultra 550B A55B wins none, but costs 95% less.
Which is better for coding?
GPT-6 Astra. It wins 4 of the 4 coding tests both models report; Nemotron 3 Ultra 550B A55B wins none.
Which is cheaper?
GPT-6 Astra costs $10.00 per million input tokens and $50.00 per million output tokens; Nemotron 3 Ultra 550B A55B costs $0.60 and $2.70. That makes Nemotron 3 Ultra 550B A55B about 95% cheaper for the same work.
How do you compare the two?
We use the 30 benchmark tests both models have published scores on. The verdict counts the 19 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.