Claude Sonnet 4 vs LongCat Flash Lite
Wins 5 of 6 areas
Coding · Reasoning · Facts · Long documents · Following instructions
Wins 1 of 6 areas
Agents
Claude Sonnet 4 is the stronger all-rounder.LongCat Flash Lite is better at agents.
Scores updated · 23 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 software40Claude Sonnet 44 of 4 tests
- ReasoningHard problems that need careful thinking20Claude Sonnet 42 of 3 tests · 1 tie
- 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
- Following instructionsDoing exactly what it is asked10Claude Sonnet 41 of 1 test
- AgentsCarrying out multi-step tasks on its own01LongCat Flash Lite1 of 1 test
Agents, 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+67.1points ahead
- Reasons across sets of long documentsAA-LCR+42points ahead
- Hard command-line tasks in a real terminalTerminal-Bench Hard+20.5points ahead
Where LongCat Flash Lite pulls ahead
- Real work tasks from 44 professionsGDPVal+7.1points ahead
Every test, side by side
All 23 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 20.531.110.6+20.5
- SWE-bench MultilingualClaude Sonnet 4 by 18.856.938.1+18.8
- SWE-bench VerifiedClaude Sonnet 4 by 18.372.754.4+18.3
- SciCodeClaude Sonnet 4 by 11.64028.4+11.6
ReasoningClaude Sonnet 4
- GPQA DiamondClaude Sonnet 4 by 14.177.763.6+14.1
- Humanity's Last ExamClaude Sonnet 4 by 4.910.75.8+4.9
- CritPttie0.30tie
FactsClaude Sonnet 4
- AA-Omniscience · Non-hallucinationClaude Sonnet 4 by 67.170.93.8+67.1
- AA-Omniscience · AccuracyClaude Sonnet 4 by 9.422.713.3+9.4
Following instructionsClaude Sonnet 4
- IFBenchClaude Sonnet 4 by 11.654.743.1+11.6
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.
- AA-OmniscienceClaude Sonnet 4 by 70.30.2-70.1+70.3
- AA Agentic IndexLongCat Flash Lite by 21.217.638.8+21.2
- Artificial Analysis Coding IndexClaude Sonnet 4 by 21.137.616.5+21.1
- τ²-Bench Telecom (AA run)LongCat Flash Lite by 14.964.679.5+14.9
- AA IntelligenceClaude Sonnet 4 by 7.418.911.5+7.4
- AIME 2025Claude Sonnet 4 by 7.370.563.2+7.3
- MMLU-ProClaude Sonnet 4 by 5.483.778.3+5.4
- MATH-500 (EM)LongCat Flash Lite by 2.89496.8+2.8
- Tau2 airlineLongCat Flash Lite by 2.555.558+2.5
- τ²-Bench (Retail)Claude Sonnet 4 by 1.97573.1+1.9
- Terminal-BenchClaude Sonnet 4 by 1.735.533.8+1.7
Questions people ask
Which is better, Claude Sonnet 4 or LongCat Flash Lite?
Claude Sonnet 4 wins five of the six areas where both have results: coding, reasoning, facts, long documents and following instructions. LongCat Flash Lite wins agents.
Which is better for coding?
Claude Sonnet 4. It wins 4 of the 4 coding tests both models report; LongCat Flash Lite wins none.
How do you compare the two?
We use the 23 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 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.