Claude Sonnet 4 vs K-EXAONE
Wins 4 of 6 areas
Coding · Agents · Facts · Long documents
Wins 2 of 6 areas
Reasoning · Following instructions
Claude Sonnet 4 is the stronger all-rounder.K-EXAONE is better at reasoning.
Scores updated · 17 tests both models report · How we compare
Where each one wins
Tests won in each of the six 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 software30Claude Sonnet 43 of 3 tests
- AgentsCarrying out multi-step tasks on its own20Claude Sonnet 42 of 2 tests
- FactsGetting facts right instead of making them up20Claude Sonnet 42 of 2 tests
- Long documentsFinding answers in very long texts10Claude Sonnet 41 of 1 test
- ReasoningHard problems that need careful thinking01K-EXAONE1 of 3 tests · 2 ties
- Following instructionsDoing exactly what it is asked01K-EXAONE1 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 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+59.7points ahead
- Reasons across sets of long documentsAA-LCR+9points ahead
- Hard command-line tasks in a real terminalTerminal-Bench Hard+8.4points ahead
Where K-EXAONE pulls ahead
- Follows unfamiliar, precisely checkable instructionsIFBench+10points ahead
- Very hard expert questions across many subjectsHumanity's Last Exam+3.2points ahead
Every test, side by side
All 17 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Sonnet 4
- Terminal-Bench HardClaude Sonnet 4 by 8.431.122.7+8.4
- Terminal-Bench 2.1Claude Sonnet 4 by 636.330.3+6
- SciCodeClaude Sonnet 4 by 4.44035.6+4.4
AgentsClaude Sonnet 4
- GDPValClaude Sonnet 4 by 9.79.70+9.7
- τ-Bench V3 · BankingClaude Sonnet 4 by 2.516.714.2+2.5
ReasoningK-EXAONE
- Humanity's Last ExamK-EXAONE by 3.210.713.9+3.2
- CritPttie0.31.1tie
- GPQA Diamondtie77.778.3tie
FactsClaude Sonnet 4
- AA-Omniscience · Non-hallucinationClaude Sonnet 4 by 59.770.911.2+59.7
- AA-Omniscience · AccuracyClaude Sonnet 4 by 6.322.716.4+6.3
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.
- AA-OmniscienceClaude Sonnet 4 by 58.20.2-58+58.2
- τ²-Bench Telecom (AA run)K-EXAONE by 9.764.674.3+9.7
- AA Agentic IndexClaude Sonnet 4 by 9.617.68+9.6
- Artificial Analysis Coding IndexClaude Sonnet 4 by 5.537.632.1+5.5
- AA IntelligenceClaude Sonnet 4 by 4.518.914.4+4.5
Questions people ask
Which is better, Claude Sonnet 4 or K-EXAONE?
Claude Sonnet 4 wins four of the six areas where both have results: coding, agents, facts and long documents. K-EXAONE wins reasoning and following instructions.
Which is better for coding?
Claude Sonnet 4. It wins 3 of the 3 coding tests both models report; K-EXAONE wins none.
How do you compare the two?
We use the 17 benchmark tests both models have published scores on. The verdict counts the 12 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.