Model comparison
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Differences vs. claude-opus-5-5 · max
Score, cost & time differences
Current baseline · claude-opus-5-5 · max
84Backend engineering
Compared with claude-opus-5-5 · max
- k3.1-pro · max
Backend engineering: tiedReference cost $1.87 ($0.83 more)Evaluation time 42m 34s (33m 5s more)
Differences reflect these evaluation tasks. Cost and time cover the same dimension, not a typical conversation. Scoring & cost notes
| Metric | claude-opus-5-5 · max | k3.1-pro · max |
|---|---|---|
| Backend engineering | claude-opus-5-5max 84 | k3.1-promax 84Tied |
| Overall | claude-opus-5-5max 89.15 | k3.1-promax 79.60−9.55 pts |
| Frontend interaction | claude-opus-5-5max 97 | k3.1-promax 91−6 pts |
| Knowledge & Reasoning | claude-opus-5-5max 100 | k3.1-promax 80−20 pts |
| Visual aesthetics | claude-opus-5-5max 73 | k3.1-promax 68−5 pts |
| Maintainability | claude-opus-5-5max 70 | k3.1-promax 64−6 pts |
Backend engineering evaluation · Evaluation consumption, not a monthly subscription fee
Cost & time
Backend engineering evaluation| Metric | claude-opus-5-5 · max | k3.1-pro · max |
|---|---|---|
| Reference cost | claude-opus-5-5max $1.05 | k3.1-promax $1.87+$0.83 |
| Evaluation time | claude-opus-5-5max 9m 29s | k3.1-promax 42m 34s+349% |
Capability profiles
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Behind each score
Expand to inspect each subaxis.
Backend engineeringSubscores
| Scoring dimension | claude-opus-5-5max | k3.1-promax |
|---|---|---|
| Contracts and boundaries | 18 / 20 | 16 / 20 |
| Retries and failures | 16 / 20 | 18 / 20 |
| CI and adversarial review | 16 / 20 | 13 / 20 |
| Transactions and consistency | 16 / 20 | 19 / 20 |
| Caching and regression | 18 / 20 | 18 / 20 |
Frontend interactionSubscores
| Scoring dimension | claude-opus-5-5max | k3.1-promax |
|---|---|---|
| Layout and adaptation | 20 / 20 | 20 / 20 |
| Interaction behavior | 20 / 20 | 20 / 20 |
| State continuity | 20 / 20 | 15 / 20 |
| Accessibility and feedback | 12 / 15 | 15 / 15 |
| State validation and regression | 25 / 25 | 21 / 25 |
Knowledge & ReasoningSubscores
| Scoring dimension | claude-opus-5-5max | k3.1-promax |
|---|---|---|
| Mathematical reasoning | 15 / 15 | 15 / 15 |
| Computer science & AI | 15 / 15 | 5 / 15 |
| Science and engineering | 10 / 10 | 10 / 10 |
| Life sciences and medicine | 20 / 20 | 15 / 20 |
| Humanities and general knowledge | 40 / 40 | 35 / 40 |
Visual aestheticsSubscores
| Scoring dimension | claude-opus-5-5max | k3.1-promax |
|---|---|---|
| Composition | 19 / 20 | 20 / 20 |
| Spacing and alignment | 18 / 20 | 15 / 20 |
| Typography and expression | 18 / 20 | 16 / 20 |
| Color and surfaces | 19 / 20 | 20 / 20 |
| Control styling | 16 / 20 | 17 / 20 |
Subscores retain their original scale; the axis score uses a consistent conversion.
MaintainabilitySubscores
| Scoring dimension | claude-opus-5-5max | k3.1-promax |
|---|---|---|
| Semantic clarity | 16 / 20 | 16 / 20 |
| Control-flow organization | 20 / 20 | 20 / 20 |
| Locality of changes | 18 / 20 | 15 / 20 |
| State and lifecycle | 18 / 20 | 18 / 20 |
| Implementation economy | 17 / 20 | 17 / 20 |
Subscores retain their original scale; the axis score uses a consistent conversion.