Model comparison
Aion-2.0 vs Claude Fable 5
Head-to-head evidence from 0 shared benchmark results across 0 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Aion-2.0 #124 (Estimated); Claude Fable 5 #2 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Aion-2.0 and Claude Fable 5 share 0 comparable benchmark results. 0 of 8 categories are comparable. 0 results are unique to Aion-2.0; 34 to Claude Fable 5.
Updated July 23, 2026- Shared results
- 0
- Aion-2.0 only
- 0
- Claude Fable 5 only
- 34
- Comparable categories
- 0 / 8
Benchmark data for Aion-2.0 and Claude Fable 5 is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 0 shared benchmark results across 0 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 does not have sourced benchmark coverage for Aion-2.0 yet. This comparison is currently limited to metadata such as context window, reasoning mode, and pricing where available.
Claude Fable 5 is priced at $10.00 input / $50.00 output per 1M tokens, versus $0.80 input / $1.60 output per 1M tokens for Aion-2.0. Claude Fable 5 has the larger context window at 1M+, compared with 128K for Aion-2.0.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Aion-2.0 | Claude Fable 5 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Aion-2.0$0.8 input / $1.6 output | Claude Fable 5$10 input / $50 output | Aion-2.0 has the lower combined listed price. |
| Generation speedtokens per second | Aion-2.0Not available | Claude Fable 5Not available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Aion-2.0Not available | Claude Fable 5Not available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Aion-2.0128K | Claude Fable 51M+ | Claude Fable 5 lists the larger context window. |
Benchmark Deep Dive
Agentic13 benchmarks
| Benchmark | Aion-2.0 | Claude Fable 5 | 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% | 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 |
Coding9 benchmarks
| Benchmark | Aion-2.0 | Claude Fable 5 | 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% | Not comparable |
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | Aion-2.0 | Claude Fable 5 | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | — | 59.9% | Not comparable |
| 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 | Aion-2.0 | Claude Fable 5 | Result |
|---|---|---|---|
| AA-IFBenchSource | — | 63.5% | Not comparable |
Frequently Asked Questions (3)
Can I compare Aion-2.0 and Claude Fable 5 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 Aion-2.0 and Claude Fable 5 today?
Aion-2.0: $0.80 input / $1.60 output per 1M tokens Claude Fable 5: $10.00 input / $50.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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