Claude Opus 4.8 vs JT-4.1 Flash 236B A21B
Wins 4 of 5 areas
Coding · Agents · Reasoning · Facts
Wins 0 of 5 areas
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Claude Opus 4.8 is the stronger all-rounder.
Scores updated · 15 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.
- AgentsCarrying out multi-step tasks on its own30Claude Opus 4.83 of 3 tests
- ReasoningHard problems that need careful thinking30Claude Opus 4.83 of 3 tests
- CodingWriting and fixing software20Claude Opus 4.82 of 2 tests
- FactsGetting facts right instead of making them up10Claude Opus 4.81 of 2 tests · 1 tie
- Long documentsFinding answers in very long texts00Even0 each · 1 tie
Long documents rests on a single test.
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 Opus 4.8 pulls ahead
- Command-line tasks in a real terminalTerminal-Bench 2.1+25points ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+18.7points ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+17.7points ahead
Where JT-4.1 Flash 236B A21B pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 15 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Opus 4.8
- Terminal-Bench 2.1Claude Opus 4.8 by 2584.659.6+25
- SciCodeClaude Opus 4.8 by 2.454.452+2.4
AgentsClaude Opus 4.8
- Terminal-Bench 4.0Claude Opus 4.8 by 18.721.73+18.7
- GDPValClaude Opus 4.8 by 6.447.841.4+6.4
- τ-Bench V3 · BankingClaude Opus 4.8 by 6.234.228+6.2
ReasoningClaude Opus 4.8
- GPQA DiamondClaude Opus 4.8 by 7.59284.5+7.5
- CritPtClaude Opus 4.8 by 6.920.914+6.9
- Humanity's Last ExamClaude Opus 4.8 by 5.148.743.6+5.1
FactsClaude Opus 4.8
- AA-Omniscience · Non-hallucinationClaude Opus 4.8 by 17.760.743+17.7
- AA-Omniscience · Accuracytie48.849.4tie
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.
- Artificial Analysis Coding IndexClaude Opus 4.8 by 21.974.352.4+21.9
- AA-OmniscienceClaude Opus 4.8 by 8.228.820.6+8.2
- AA IntelligenceClaude Opus 4.8 by 7.941.833.9+7.9
- AA Agentic IndexClaude Opus 4.8 by 7.742.634.9+7.7
Questions people ask
Which is better, Claude Opus 4.8 or JT-4.1 Flash 236B A21B?
Claude Opus 4.8 wins four of the five areas where both have results: coding, agents, reasoning and facts. JT-4.1 Flash 236B A21B wins none. They are level on long documents.
Which is better for coding?
Claude Opus 4.8. It wins 2 of the 2 coding tests both models report; JT-4.1 Flash 236B A21B wins none.
How do you compare the two?
We use the 15 benchmark tests both models have published scores on. The verdict counts the 11 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.