Model comparison
Claude Fable 5 vs Grok 4
Head-to-head evidence from 11 shared benchmark results across 5 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude Fable 5 #2 (Supported); Grok 4 #50 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude Fable 5 and Grok 4 share 11 comparable benchmark results. 0 of 8 categories are comparable. 23 results are unique to Claude Fable 5; 5 to Grok 4.
Updated July 23, 2026- Shared results
- 11
- Claude Fable 5 only
- 23
- Grok 4 only
- 5
- Comparable categories
- 0 / 8
Benchmark data for Claude Fable 5 and Grok 4 is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 11 shared benchmark results across 5 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
Claude Fable 5 has the larger context window at 1M+, compared with 128K for Grok 4.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Claude Fable 5 | Δ | Grok 4 |
|---|---|---|---|
| Agentic | Claude Fable 584.6 | MarginNo overlap | Grok 4Not measured |
| Coding | Claude Fable 589.2 | MarginNo overlap | Grok 4Not measured |
| Math | Claude Fable 5Not measured | MarginNo overlap | Grok 415.3 |
| Multimodal | Claude Fable 557.9 | MarginNo overlap | Grok 4Not measured |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude Fable 5 | Grok 4 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude Fable 5$10 input / $50 output | Grok 4Not available | A complete price comparison is not available. |
| Generation speedtokens per second | Claude Fable 5Not available | Grok 454 tok/s | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude Fable 5Not available | Grok 415.60 s | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude Fable 51M+ | Grok 4128K | Claude Fable 5 lists the larger context window. |
Benchmark Deep Dive
Agentic14 benchmarks
| Benchmark | Claude Fable 5 | Grok 4 | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | 84.3% | — | Not comparable |
| OSWorld-VerifiedSource | 85% | — | Not comparable |
| GDPval-AASource | 1748 | — | Not comparable |
| AA Agentic IndexSource | 52.8% | — | Not comparable |
| τ²-bench resultsSource | 98.5% | 74.9% | Claude Fable 5 leads |
| GDPval-AASource | 62.4% | — | Not comparable |
| AA BriefcaseSource | 1574 | — | Not comparable |
| AA AutomationBenchSource | 48.6% | — | Not comparable |
| AA EnterpriseOps-GymSource | 51.1% | — | Not comparable |
| AA Harvey LABSource | 93.6% | — | Not comparable |
| AA Tau3 BankingSource | 26.8% | — | Not comparable |
| terminalBenchHardSource | 62.9% | — | Not comparable |
| aaTerminalBench21Source | 84.6% | — | Not comparable |
| Gert LabsSource | — | 42.34% | Not comparable |
Coding10 benchmarks
| Benchmark | Claude Fable 5 | Grok 4 | Result |
|---|---|---|---|
| SWE-bench VerifiedSource | 95% | — | Not comparable |
| SWE-bench ProSource | 80% | — | Not comparable |
| FrontierCode 1.1 MainSource | 53.5% | — | Not comparable |
| Terminal-Bench 2.0Source | 84.3% | — | Not comparable |
| cursorBench31Source | 70.6% | — | Not comparable |
| cursorBench32Source | 70.5% | — | Not comparable |
| VulcanBench v3Source | 87.0% | — | Not comparable |
| AA Coding IndexSource | 76.5% | — | Not comparable |
| AA-SciCodeSource | 60.2% | 45.7% | Claude Fable 5 leads |
| React Native EvalsSource | — | 72.6% | Not comparable |
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | Claude Fable 5 | Grok 4 | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 59.9% | 33.3% | Claude Fable 5 leads |
| AA-GPQA DiamondSource | 92.6% | 87.7% | Claude Fable 5 leads |
| AA-HLESource | 53.3% | 23.9% | Claude Fable 5 leads |
| AA-Omniscience IndexSource | 40.2% | 3.8% | Claude Fable 5 leads |
| AA-Omniscience AccuracySource | 61.4% | 41.4% | Claude Fable 5 leads |
| AA-Omniscience Hallucination RateSource | 54.9% | 64.2% | Claude Fable 5 leads |
Math2 benchmarks
Multimodal4 benchmarks
Inst. Following1 benchmarks
| Benchmark | Claude Fable 5 | Grok 4 | Result |
|---|---|---|---|
| AA-IFBenchSource | 63.5% | 53.7% | Claude Fable 5 leads |
Frequently Asked Questions (3)
Can I compare Claude Fable 5 and Grok 4 on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for Claude Fable 5 and Grok 4 today?
Claude Fable 5: $10.00 input / $50.00 output per 1M tokens Grok 4: Pricing unavailable Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
Related Comparisons
Choose a model with this week’s evidence
Join 2,000+ readers for ranking moves, pricing changes, and the claims that still need proof.
One email each week. Unsubscribe anytime.