Claude Haiku 4.5 vs LongCat Flash Lite
Wins 5 of 6 areas
Coding · Reasoning · Facts · Long documents · Following instructions
Wins 1 of 6 areas
Agents
Claude Haiku 4.5 is the stronger all-rounder.LongCat Flash Lite is better at agents.
Scores updated · 21 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 Haiku 4.54 of 4 tests
- ReasoningHard problems that need careful thinking20Claude Haiku 4.52 of 3 tests · 1 tie
- FactsGetting facts right instead of making them up20Claude Haiku 4.52 of 2 tests
- Long documentsFinding answers in very long texts10Claude Haiku 4.51 of 1 test
- Following instructionsDoing exactly what it is asked10Claude Haiku 4.51 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 Haiku 4.5 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+68.9points ahead
- Reasons across sets of long documentsAA-LCR+46points ahead
- Fixes real GitHub issues in many programming languagesSWE-bench Multilingual+29.3points ahead
Where LongCat Flash Lite pulls ahead
- Real work tasks from 44 professionsGDPVal+5points ahead
Every test, side by side
All 21 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Haiku 4.5
- SWE-bench MultilingualClaude Haiku 4.5 by 29.367.438.1+29.3
- SWE-bench VerifiedClaude Haiku 4.5 by 18.973.354.4+18.9
- Terminal-Bench HardClaude Haiku 4.5 by 16.727.310.6+16.7
- SciCodeClaude Haiku 4.5 by 13.842.228.4+13.8
ReasoningClaude Haiku 4.5
- Humanity's Last ExamClaude Haiku 4.5 by 4.610.45.8+4.6
- GPQA DiamondClaude Haiku 4.5 by 3.667.263.6+3.6
- CritPttie00tie
FactsClaude Haiku 4.5
- AA-Omniscience · Non-hallucinationClaude Haiku 4.5 by 68.972.73.8+68.9
- AA-Omniscience · AccuracyClaude Haiku 4.5 by 4.71813.3+4.7
Following instructionsClaude Haiku 4.5
- IFBenchClaude Haiku 4.5 by 11.254.343.1+11.2
Other results9 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 Haiku 4.5 by 65.7-4.4-70.1+65.7
- AA Agentic IndexLongCat Flash Lite by 28.510.338.8+28.5
- Artificial Analysis Coding IndexClaude Haiku 4.5 by 27.443.916.5+27.4
- τ²-Bench Telecom (AA run)LongCat Flash Lite by 24.854.779.5+24.8
- AIME 2025Claude Haiku 4.5 by 17.580.763.2+17.5
- τ²-Bench (Retail)Claude Haiku 4.5 by 10.183.273.1+10.1
- Terminal-BenchClaude Haiku 4.5 by 7.24133.8+7.2
- Tau2 airlineClaude Haiku 4.5 by 5.663.658+5.6
- AA IntelligenceClaude Haiku 4.5 by 5.416.911.5+5.4
Questions people ask
Which is better, Claude Haiku 4.5 or LongCat Flash Lite?
Claude Haiku 4.5 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 Haiku 4.5. 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 21 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 9 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.