Claude Sonnet 4.5 vs Nova Premier
Wins 5 of 5 areas
Coding · Reasoning · Facts · Long documents · Following instructions
Wins 0 of 5 areas
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Claude Sonnet 4.5 is the stronger all-rounder.
Scores updated · 14 tests both models report · How we compare
Where each one wins
Tests won in each of the five 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 thinking30Claude Sonnet 4.53 of 3 tests
- CodingWriting and fixing software20Claude Sonnet 4.52 of 2 tests
- FactsGetting facts right instead of making them up20Claude Sonnet 4.52 of 2 tests
- Long documentsFinding answers in very long texts10Claude Sonnet 4.51 of 1 test
- Following instructionsDoing exactly what it is asked10Claude Sonnet 4.51 of 1 test
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.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where Claude Sonnet 4.5 pulls ahead
- Reasons across sets of long documentsAA-LCR+38points ahead
- Hard command-line tasks in a real terminalTerminal-Bench Hard+28.8points ahead
- Graduate-level biology, physics and chemistry questionsGPQA Diamond+26.5points ahead
Where Nova Premier pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 14 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Sonnet 4.5
- Terminal-Bench HardClaude Sonnet 4.5 by 28.835.66.8+28.8
- SciCodeClaude Sonnet 4.5 by 17.845.727.9+17.8
ReasoningClaude Sonnet 4.5
- GPQA DiamondClaude Sonnet 4.5 by 26.583.456.9+26.5
- Humanity's Last ExamClaude Sonnet 4.5 by 13.617.84.2+13.6
- CritPtClaude Sonnet 4.5 by 1.11.10+1.1
FactsClaude Sonnet 4.5
- AA-Omniscience · Non-hallucinationClaude Sonnet 4.5 by 22.850.928.1+22.8
- AA-Omniscience · AccuracyClaude Sonnet 4.5 by 11.632.921.3+11.6
Following instructionsClaude Sonnet 4.5
- IFBenchClaude Sonnet 4.5 by 21.157.336.2+21.1
Other results5 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.
- τ²-Bench Telecom (AA run)Claude Sonnet 4.5 by 39.878.138.3+39.8
- Artificial Analysis Coding IndexClaude Sonnet 4.5 by 38.352.113.8+38.3
- AA-OmniscienceClaude Sonnet 4.5 by 35.3-0.1-35.4+35.3
- AA IntelligenceClaude Sonnet 4.5 by 11.520.79.2+11.5
- AA Agentic IndexClaude Sonnet 4.5 by 1.117.516.4+1.1
Questions people ask
Which is better, Claude Sonnet 4.5 or Nova Premier?
Claude Sonnet 4.5 wins all five areas where both have results: coding, reasoning, facts, long documents and following instructions. Nova Premier wins none.
Which is better for coding?
Claude Sonnet 4.5. It wins 2 of the 2 coding tests both models report; Nova Premier wins none.
How do you compare the two?
We use the 14 benchmark tests both models have published scores on. The verdict counts the 9 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 5 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.