Model comparison
Claude 4.1 Opus vs Claude Fable 5
Head-to-head evidence from 3 shared benchmark results across 3 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude 4.1 Opus #142 (Supported); Claude Fable 5 #2 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude 4.1 Opus and Claude Fable 5 share 3 comparable benchmark results. 1 of 8 categories are comparable. 1 result is unique to Claude 4.1 Opus; 31 to Claude Fable 5.
Updated July 23, 2026- Shared results
- 3
- Claude 4.1 Opus only
- 1
- Claude Fable 5 only
- 31
- Comparable categories
- 1 / 8
Pick Claude Fable 5 if you want the stronger benchmark profile. Claude 4.1 Opus only becomes the better choice if you would rather avoid the extra latency and token burn of a reasoning model.
Confidence note. This is a partial-evidence comparison with 3 shared benchmark results across 3 evidence categories; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Claude Fable 5 is clearly ahead on the BenchAlign aggregate, 83.68 to 45.88. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Fable 5's sharpest advantage is in coding, where it averages 89.2 against 74.5. The single biggest benchmark swing on the page is SWE-bench Verified, 74.5% to 95%.
Claude 4.1 Opus is also the more expensive model on tokens at $15.00 input / $75.00 output per 1M tokens, versus $10.00 input / $50.00 output per 1M tokens for Claude Fable 5. Claude Fable 5 is the reasoning model in the pair, while Claude 4.1 Opus is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. Claude Fable 5 gives you the larger context window at 1M+, compared with 200K for Claude 4.1 Opus.
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 4.1 Opus | Δ | Claude Fable 5 |
|---|---|---|---|
| Coding | Claude 4.1 Opus74.5 | Margin→ 14.7 | Claude Fable 589.2 |
| Agentic | Claude 4.1 OpusNot measured | MarginNo overlap | Claude Fable 584.6 |
| Multimodal | Claude 4.1 OpusNot measured | MarginNo overlap | Claude Fable 557.9 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
SWE-bench Verified
CodingA 74.5%B 95%Winner: Claude Fable 5Δ 20.5SWE-bench Verified: Claude 4.1 Opus scored 74.5%; Claude Fable 5 scored 95%. Claude Fable 5 wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude 4.1 Opus | Claude Fable 5 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude 4.1 Opus$15 input / $75 output | Claude Fable 5$10 input / $50 output | Claude Fable 5 has the lower combined listed price. |
| Generation speedtokens per second | Claude 4.1 Opus29 tok/s | Claude Fable 5Not available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude 4.1 Opus1.66 s | Claude Fable 5Not available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude 4.1 Opus200K | Claude Fable 51M+ | Claude Fable 5 lists the larger context window. |
Benchmark Deep Dive
Agentic14 benchmarks
| Benchmark | Claude 4.1 Opus | Claude Fable 5 | Result |
|---|---|---|---|
| JobBenchSource | 21.9% | — | Not comparable |
| 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% | Not comparable |
| 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 |
CodingClaude Fable 5 wins9 benchmarks
| Benchmark | Claude 4.1 Opus | Claude Fable 5 | Result |
|---|---|---|---|
| SWE-bench VerifiedSource | 74.5% | 95% | Claude Fable 5 leads |
| 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% | Not comparable |
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | Claude 4.1 Opus | Claude Fable 5 | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 28.2% | 59.9% | Claude Fable 5 leads |
| AA-GPQA DiamondSource | — | 92.6% | Not comparable |
| AA-HLESource | — | 53.3% | Not comparable |
| AA-Omniscience IndexSource | — | 40.2% | Not comparable |
| AA-Omniscience AccuracySource | — | 61.4% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 54.9% | Not comparable |
Multimodal3 benchmarks
Inst. Following1 benchmarks
| Benchmark | Claude 4.1 Opus | Claude Fable 5 | Result |
|---|---|---|---|
| AA-IFBenchSource | — | 63.5% | Not comparable |
Frequently Asked Questions (2)
Which is better, Claude 4.1 Opus or Claude Fable 5?
Claude Fable 5 is ahead on BenchLM's BenchAlign leaderboard, 83.68 to 45.88. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 74.5% and 95%.
Which is better for coding, Claude 4.1 Opus or Claude Fable 5?
Claude Fable 5 has the edge for coding in this comparison, averaging 89.2 versus 74.5. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
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