Compare / Claude Opus 5.5 vs DeepSeek V4.1 Flash
Claude Opus 5.5 vs DeepSeek V4.1 Flash
38 results from 2 sources that measured both models. Each row is in the source's own units; there is no overall winner.
| Benchmark | Metric | Claude Opus 5.5 | DeepSeek V4.1 Flash |
|---|---|---|---|
| CatalogBenchmeasured by us | Channel rules broken% of products | 0.6% | 1.8% |
| CatalogBenchmeasured by us | Content quality% of checks | 96.6% | 95.4% |
| CatalogBenchmeasured by us | Failed outputs% of products | 0.0% | 0.6% |
| CatalogBenchmeasured by us | Missing UK information% of products | 0.0% | 0.0% |
| CatalogBenchmeasured by us | Not findable% of products | 1.8% | 3.6% |
| CatalogBenchmeasured by us | Publish-ready listings% of products | 3.6% | 24.4% |
| CatalogBenchmeasured by us | Reliably publish-ready% of products | 0.0% | 10.7% |
| CatalogBenchmeasured by us | Unsupported claimsclaims per product | 4.36 | 2.79 |
| CatalogBenchmeasured by us | Unsupported claims% of products | 95.2% | 70.2% |
| CatalogBenchmeasured by us | Wrong attributes% of products | 15.5% | 20.2% |
| CatalogBenchmeasured by us | Wrong category or variant% of products | 1.8% | 2.4% |
| CatalogBenchmeasured by us | Channel compliance% of products | 100.0% | 99.4% |
| CatalogBenchmeasured by us | Channel rules broken% of products | 0.0% | 3.0% |
| CatalogBenchmeasured by us | Conflicts caught% of conflicts | 100.0% | 100.0% |
| CatalogBenchmeasured by us | Content quality% of checks | 97.2% | 96.3% |
| CatalogBenchmeasured by us | Cost per productUS dollars | $0.0400 | $0.0061 |
| CatalogBenchmeasured by us | Decision accuracy% of decisions | 96.6% | 96.2% |
| CatalogBenchmeasured by us | Failed outputs% of products | 0.0% | 0.0% |
| CatalogBenchmeasured by us | Field accuracy% of missing fields | 92.2% | 94.4% |
| CatalogBenchmeasured by us | Invented values% of filled values | 0.5% | 3.1% |
| CatalogBenchmeasured by us | Missing UK information% of products | 0.0% | 0.0% |
| CatalogBenchmeasured by us | Not findable% of products | 3.0% | 3.6% |
| CatalogBenchmeasured by us | Publish-ready listings% of products | 58.3% | 58.3% |
| CatalogBenchmeasured by us | Reliably publish-ready% of products | 39.3% | 35.7% |
| CatalogBenchmeasured by us | Unsupported claimsclaims per product | 0.83 | 0.72 |
| CatalogBenchmeasured by us | Unsupported claims% of products | 30.9% | 19.6% |
| CatalogBenchmeasured by us | Wrong attributes% of products | 15.5% | 20.2% |
| CatalogBenchmeasured by us | Wrong category or variant% of products | 1.8% | 3.0% |
| Arena (formerly LMArena)reported | Confirmed task successIPS effect estimate | 0.16 | 0.12 |
| Arena (formerly LMArena)reported | Praise over complaintIPS effect estimate | 0.19 | 0.03 |
| Arena (formerly LMArena)reported | SteerabilityIPS effect estimate | 0.14 | -0.03 |
| Arena (formerly LMArena)reported | Tool groundingIPS effect estimate | 0.00 | 0.00 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,499 | 1,481 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,521 | 1,440 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,556 | 1,518 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,516 | 1,478 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,509 | 1,477 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,520 | 1,455 |
Bold green marks the better value on that metric. Where a source reports ranges that overlap, the difference may not be meaningful; see the benchmark page for ranges.