Model comparison
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Differences vs. gpt-5.6-terra · low
Score, cost & time differences
Current baseline · gpt-5.6-terra · low
53Backend engineering
Compared with gpt-5.6-terra · low
- k2.8 · high
Backend engineering: +1 ptsReference cost $0.21 ($0.013 less)Evaluation time 22m 14s (12m 33s more)
Differences reflect these evaluation tasks. Cost and time cover the same dimension, not a typical conversation. Scoring & cost notes
| Metric | gpt-5.6-terra · low | k2.8 · high |
|---|---|---|
| Backend engineering | gpt-5.6-terralow 53 | k2.8high 54+1 pts |
| Overall | gpt-5.6-terralow — | k2.8high 63.55 |
| Frontend interaction | gpt-5.6-terralow 21 | k2.8high 72+51 pts |
| Knowledge & Reasoning | gpt-5.6-terralow 30 | k2.8high 70+40 pts |
| Visual aesthetics | gpt-5.6-terralow — | k2.8high 57 |
| Maintainability | gpt-5.6-terralow — | k2.8high 53 |
Backend engineering evaluation · Evaluation consumption, not a monthly subscription fee
Cost & time
Backend engineering evaluation| Metric | gpt-5.6-terra · low | k2.8 · high |
|---|---|---|
| Reference cost | gpt-5.6-terralow $0.22 | k2.8high $0.21−$0.013 |
| Evaluation time | gpt-5.6-terralow 9m 41s | k2.8high 22m 14s+129.7% |
Capability profiles
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Behind each score
Expand to inspect each subaxis.
Backend engineeringSubscores
| Scoring dimension | gpt-5.6-terralow | k2.8high |
|---|---|---|
| Contracts and boundaries | 8 / 20 | 9 / 20 |
| Retries and failures | 11 / 20 | 15 / 20 |
| CI and adversarial review | 8 / 20 | 14 / 20 |
| Transactions and consistency | 12 / 20 | 9 / 20 |
| Caching and regression | 14 / 20 | 7 / 20 |
Frontend interactionSubscores
| Scoring dimension | gpt-5.6-terralow | k2.8high |
|---|---|---|
| Layout and adaptation | 5 / 20 | 16 / 20 |
| Interaction behavior | 0 / 20 | 18 / 20 |
| State continuity | 2 / 20 | 15 / 20 |
| Accessibility and feedback | 0 / 15 | 10 / 15 |
| State validation and regression | 14 / 25 | 13 / 25 |
Knowledge & ReasoningSubscores
| Scoring dimension | gpt-5.6-terralow | k2.8high |
|---|---|---|
| Mathematical reasoning | 5 / 15 | 5 / 15 |
| Computer science & AI | 10 / 15 | 5 / 15 |
| Science and engineering | 0 / 10 | 5 / 10 |
| Life sciences and medicine | 5 / 20 | 20 / 20 |
| Humanities and general knowledge | 10 / 40 | 35 / 40 |
Visual aestheticsSubscores
| Scoring dimension | gpt-5.6-terralow | k2.8high |
|---|---|---|
| Composition | — | 16 / 20 |
| Spacing and alignment | — | 17 / 20 |
| Typography and expression | — | 16 / 20 |
| Color and surfaces | — | 19 / 20 |
| Control styling | — | 15 / 20 |
Subscores retain their original scale; the axis score uses a consistent conversion.
MaintainabilitySubscores
| Scoring dimension | gpt-5.6-terralow | k2.8high |
|---|---|---|
| Semantic clarity | — | 14 / 20 |
| Control-flow organization | — | 19 / 20 |
| Locality of changes | — | 15 / 20 |
| State and lifecycle | — | 17 / 20 |
| Implementation economy | — | 16 / 20 |
Subscores retain their original scale; the axis score uses a consistent conversion.