Claude Opus 4 vs Claude Opus 4.1
Wins 0 of 5 areas
—
Wins 3 of 5 areas
Coding · Reasoning · Long documents
Claude Opus 4.1 is the stronger all-rounder.
Scores updated · 26 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.
- CodingWriting and fixing software03Claude Opus 4.13 of 3 tests
- ReasoningHard problems that need careful thinking01Claude Opus 4.11 of 2 tests · 1 tie
- Long documentsFinding answers in very long texts01Claude Opus 4.11 of 1 test
- FactsGetting facts right instead of making them up00Even0 each · 1 tie
- Following instructionsDoing exactly what it is asked11Even1 each
Facts 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 Claude Opus 4.1 pulls ahead
- Reasons across sets of long documentsAA-LCR+6.7points ahead
- Hard command-line tasks in a real terminalTerminal-Bench Hard+3.2points ahead
- Fixes real GitHub issues in Python projectsSWE-bench Verified+2points ahead
Where Claude Opus 4 pulls ahead
- Keeps track of context across a multi-turn chatMulti-Challenge+1.4points ahead
Every test, side by side
All 26 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Opus 4.1
- Terminal-Bench HardClaude Opus 4.1 by 3.231.134.3+3.2
- SWE-bench VerifiedClaude Opus 4.1 by 272.574.5+2
- SciCodeClaude Opus 4.1 by 1.139.840.9+1.1
ReasoningClaude Opus 4.1
- GPQA DiamondClaude Opus 4.1 by 1.379.680.9+1.3
- Humanity's Last Examtie12.312.5tie
Following instructionsEven
- IFBenchClaude Opus 4.1 by 1.753.755.4+1.7
- Multi-ChallengeClaude Opus 4 by 1.458.657.2+1.4
Other results17 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.
- τ²-BenchClaude Opus 4.1 by 14.55771.5+14.5
- metr_re_benchClaude Opus 4 by 52015+5
- τ²-Bench (Retail)Claude Opus 4.1 by 581.886.8+5
- SWE-bench Verified (hard subset)Claude Opus 4.1 by 4.339.543.8+4.3
- TAU-bench (airline)Claude Opus 4 by 3.659.656+3.6
- AIME 2025Claude Opus 4.1 by 2.575.578+2.5
- Artificial Analysis Coding IndexClaude Opus 4.1 by 2.53436.5+2.5
- AA IntelligenceClaude Opus 4.1 by 2.220.622.8+2.2
- τ²-Bench Telecom (AA run)Claude Opus 4 by 273.471.4+2
- vectara_answer_rateClaude Opus 4.1 by 1.49192.4+1.4
- TAU-bench (retail)Claude Opus 4.1 by 181.482.4+1
- MMMLUtie88.889.5tie
- vectara_avg_summary_lengthtie123.2129.1tie
- metr_swaatie99.8100tie
- vectara_factual_consistencytie8888.2tie
- Terminal-Benchtie43.243.3tie
- frontiermath_tier_4_v1tie4.24.2tie
Questions people ask
Which is better, Claude Opus 4 or Claude Opus 4.1?
Claude Opus 4.1 wins three of the five areas where both have results: coding, reasoning and long documents. Claude Opus 4 wins none. They are level on facts and following instructions.
Which is better for coding?
Claude Opus 4.1. It wins 3 of the 3 coding tests both models report; Claude Opus 4 wins none.
Which is cheaper?
Claude Opus 4 costs $15.00 per million input tokens and $75.00 per million output tokens; Claude Opus 4.1 costs $15.00 and $75.00. For a million tokens read plus a million written, they cost about the same.
How do you compare the two?
We use the 26 benchmark tests both models have published scores on. The verdict counts the 9 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 17 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.