Claude Sonnet 4.5 vs JT-4.1 Flash 236B A21B
Wins 1 of 6 areas
Images and charts
Wins 4 of 6 areas
Coding · Agents · Reasoning · Long documents
JT-4.1 Flash 236B A21B is the stronger all-rounder.Claude Sonnet 4.5 is better at images and charts.
Scores updated · 16 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.
- AgentsCarrying out multi-step tasks on its own03JT-4.1 Flash 236B A21B3 of 3 tests
- ReasoningHard problems that need careful thinking03JT-4.1 Flash 236B A21B3 of 3 tests
- CodingWriting and fixing software02JT-4.1 Flash 236B A21B2 of 2 tests
- Long documentsFinding answers in very long texts01JT-4.1 Flash 236B A21B1 of 1 test
- Images and chartsUnderstanding pictures, charts and video10Claude Sonnet 4.51 of 1 test
- FactsGetting facts right instead of making them up11Even1 each
Images and charts and long documents 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 JT-4.1 Flash 236B A21B pulls ahead
- Very hard expert questions across many subjectsHumanity's Last Exam+25.8points ahead
- Real work tasks from 44 professionsGDPVal+20.9points ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+16.5points ahead
Where Claude Sonnet 4.5 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+7.9points ahead
- Harder college exam questions with imagesMMMU-Pro+4.6points ahead
Every test, side by side
All 16 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingJT-4.1 Flash 236B A21B
- SciCodeJT-4.1 Flash 236B A21B by 6.345.752+6.3
- Terminal-Bench 2.1JT-4.1 Flash 236B A21B by 3.855.859.6+3.8
AgentsJT-4.1 Flash 236B A21B
- GDPValJT-4.1 Flash 236B A21B by 20.920.541.4+20.9
- τ-Bench V3 · BankingJT-4.1 Flash 236B A21B by 3.524.528+3.5
- Terminal-Bench 4.0JT-4.1 Flash 236B A21B by 303+3
ReasoningJT-4.1 Flash 236B A21B
- Humanity's Last ExamJT-4.1 Flash 236B A21B by 25.817.843.6+25.8
- CritPtJT-4.1 Flash 236B A21B by 12.91.114+12.9
- GPQA DiamondJT-4.1 Flash 236B A21B by 1.183.484.5+1.1
FactsEven
- AA-Omniscience · AccuracyJT-4.1 Flash 236B A21B by 16.532.949.4+16.5
- AA-Omniscience · Non-hallucinationClaude Sonnet 4.5 by 7.950.943+7.9
Images and chartsClaude Sonnet 4.5
- MMMU-ProClaude Sonnet 4.5 by 4.668.764.1+4.6
Long documentsJT-4.1 Flash 236B A21B
- AA-LCRJT-4.1 Flash 236B A21B by 672.378.3+6
Other results4 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-OmniscienceJT-4.1 Flash 236B A21B by 20.7-0.120.6+20.7
- AA Agentic IndexJT-4.1 Flash 236B A21B by 17.417.534.9+17.4
- AA IntelligenceJT-4.1 Flash 236B A21B by 13.220.733.9+13.2
- Artificial Analysis Coding Indextie52.152.4tie
Questions people ask
Which is better, Claude Sonnet 4.5 or JT-4.1 Flash 236B A21B?
JT-4.1 Flash 236B A21B wins four of the six areas where both have results: coding, agents, reasoning and long documents. Claude Sonnet 4.5 wins images and charts. They are level on facts.
Which is better for coding?
JT-4.1 Flash 236B A21B. It wins 2 of the 2 coding tests both models report; Claude Sonnet 4.5 wins none.
How do you compare the two?
We use the 16 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 4 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.