Model comparison
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Differences vs. Gemini 4 Hydrogen · xhigh
Score, cost & time differences
Current baseline · Gemini 4 Hydrogen · xhigh
83Backend engineering
Compared with Gemini 4 Hydrogen · xhigh
- Claude Fable 5.1 · max
Backend engineering: tiedCost $12.77 ($12.02 more)Evaluation time 43m 45s (39m 53s more)
Differences reflect these evaluation tasks. Cost and time cover the same dimension, not a typical conversation. Scoring & cost notes
| Metric | Gemini 4 Hydrogen · xhigh | Claude Fable 5.1 · max |
|---|---|---|
| Backend engineering | Gemini 4 Hydrogenxhigh 83 | Claude Fable 5.1max 83Tied |
| Overall | Gemini 4 Hydrogenxhigh 80.70 | Claude Fable 5.1max 87.40+6.7 pts |
| Frontend interaction | Gemini 4 Hydrogenxhigh 85 | Claude Fable 5.1max 91+6 pts |
| Knowledge & reasoning | Gemini 4 Hydrogenxhigh 85 | Claude Fable 5.1max 95+10 pts |
| Visual aesthetics | Gemini 4 Hydrogenxhigh 70 | Claude Fable 5.1max 80+10 pts |
| Maintainability | Gemini 4 Hydrogenxhigh 61 | Claude Fable 5.1max 68+7 pts |
Backend engineering evaluation · Evaluation consumption, not a monthly subscription fee
Cost & time
Backend engineering evaluation| Metric | Gemini 4 Hydrogen · xhigh | Claude Fable 5.1 · max |
|---|---|---|
| Cost | Gemini 4 Hydrogenxhigh $0.75 | Claude Fable 5.1max $12.77+$12.02 |
| Evaluation time | Gemini 4 Hydrogenxhigh 3m 51s | Claude Fable 5.1max 43m 45s+1034.4% |
Capability profiles
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Behind each score
Expand to inspect each subaxis.
Backend engineeringSubscores
| Scoring dimension | Gemini 4 Hydrogenxhigh | Claude Fable 5.1max |
|---|---|---|
| Contracts and boundaries | 13 / 20 | 13 / 20 |
| Retries and failures | 17 / 20 | 20 / 20 |
| CI and adversarial review | 18 / 20 | 14 / 20 |
| Transactions and consistency | 18 / 20 | 19 / 20 |
| Caching and regression | 17 / 20 | 17 / 20 |
Frontend interactionSubscores
| Scoring dimension | Gemini 4 Hydrogenxhigh | Claude Fable 5.1max |
|---|---|---|
| Layout and adaptation | — | 20 / 20 |
| Interaction behavior | — | 20 / 20 |
| State continuity | — | 15 / 20 |
| Accessibility and feedback | — | 13 / 15 |
| State validation and regression | — | 23 / 25 |
Knowledge & reasoningSubscores
| Scoring dimension | Gemini 4 Hydrogenxhigh | Claude Fable 5.1max |
|---|---|---|
| Mathematical reasoning | 15 / 15 | 15 / 15 |
| Computer science & AI | 10 / 15 | 10 / 15 |
| Science and engineering | 10 / 10 | 10 / 10 |
| Life sciences and medicine | 15 / 20 | 20 / 20 |
| Humanities and general knowledge | 35 / 40 | 40 / 40 |
Visual aestheticsSubscores
| Scoring dimension | Gemini 4 Hydrogenxhigh | Claude Fable 5.1max |
|---|---|---|
| Composition | 19 / 20 | 20 / 20 |
| Spacing and alignment | 17 / 20 | 18 / 20 |
| Typography and expression | 18 / 20 | 19 / 20 |
| Color and surfaces | 19 / 20 | 19 / 20 |
| Control styling | 16 / 20 | 17 / 20 |
Subscores retain their original scale; the axis score uses a consistent conversion.
MaintainabilitySubscores
| Scoring dimension | Gemini 4 Hydrogenxhigh | Claude Fable 5.1max |
|---|---|---|
| Semantic clarity | 16 / 20 | 16 / 20 |
| Control-flow organization | 20 / 20 | 20 / 20 |
| Locality of changes | 15 / 20 | 15 / 20 |
| State and lifecycle | 17 / 20 | 18 / 20 |
| Implementation economy | 17 / 20 | 19 / 20 |
Subscores retain their original scale; the axis score uses a consistent conversion.