OpenGPTEvidence-based model decisionsCURATED MODEL COMPARISON
Claude Fable 5 vs Grok 4.5
Claude Fable 5 vs Grok 4.5: Compare current cross-provider candidates with published evidence before validating quality, cost, and latency on the same workload. Compare exact official model IDs using published signals, provider links, and clearly separated family-level guidance.
Updated:Published data side by side
Each value keeps its original source and scale. Missing data is not treated as zero, and OpenGPT does not create a composite winner.
| Ranking angle | Claude Fable 5 | Grok 4.5 |
|---|---|---|
| User preference | Rank 1Published value: 1507Original ranking: LMArena ↗Official identity mapping ↗Research edition: 2026-08 · Aug 8, 2026 | Rank 35Published value: 1468Original ranking: LMArena ↗Official identity mapping ↗Research edition: 2026-08 · Aug 8, 2026 |
| Intelligence index | Rank 3Published value: 62Original ranking: Artificial Analysis ↗Official identity mapping ↗Research edition: 2026-08 · Aug 8, 2026 | No linked comparable data |
| Objective tasks | Rank 1Published value: 83.0Original ranking: LiveBench ↗Official identity mapping ↗Research edition: 2026-08 · Aug 8, 2026 | No linked comparable data |
| Cost per successful task | No linked comparable data | Rank 10Published value: $0.1305Original ranking: LiveBench ↗Official identity mapping ↗Research edition: 2026-08 · Aug 8, 2026 |
| Open-weight models | No linked comparable data | No linked comparable data |
This page organizes published third-party data. OpenGPT did not rerun the underlying evaluations.
What to validate
These strengths and limits describe the wider model family from official positioning, not measured results for this exact version.
Claude Fable 5
claude-fable-5Family strengths
Well suited to document analysis and sustained written work. Offers managed models for coding and agentic workflows.
Family limitations
Closed weights and API-dependent access. Capabilities and limits differ substantially between model tiers.
Grok 4.5
grok-4.5Family strengths
Managed models include tool and real-time information paths. Provides general, reasoning, coding, and multimodal variants.
Family limitations
Closed weights and provider-controlled data/tool access. Observed quality depends on the exact model and enabled tools.
Continue with your decision
Use the interactive matrix to add more models, then validate the final two on your own prompts and constraints.