# Agents-A1 vs Claude Fable 5.1

> Side-by-side benchmark comparison for Agents-A1 and Claude Fable 5.1 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/agents-a1-vs-claude-fable-5-1
- Last updated: October 17, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Agents-A1 and Claude Fable 5.1 share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Claude Fable 5.1 has the larger published context window at 1M.

## Model Snapshot

| Property | Agents-A1 | Claude Fable 5.1 |
|----------|----------|----------|
| Creator | InternScience | Anthropic |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 262K | 1M |
| Independent public score (not head-to-head) | 54.2 | 83.18 |
| Benchmarks Covered | 6 | 33 |
| Pricing (input/output) | N/A | $10.00 / $50.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Agents-A1 public-lane score: 47.3 (Estimated · #49/128)
- Claude Fable 5.1 public-lane score: 80.9 (Supported · #2/128)

| Benchmark | Agents-A1 | Claude Fable 5.1 | Winner |
|-----------|-----------|-----------|--------|
| BrowseComp | 75.5% | Coming soon | Coming soon |
| HLE w/ tools | 47.6% | Coming soon | Coming soon |
| VITA-Bench | 38.8% | Coming soon | Coming soon |
| Terminal-Bench 4.0 | Coming soon | 55.80% | Coming soon |
| Terminal-Bench-Science 0.1 | Coming soon | 52.6% | Coming soon |
| OSWorld 2.0 | Coming soon | 41.7% | Coming soon |
| AutomationBench | Coming soon | 31.4% | Coming soon |
| Toolathlon-Verified | Coming soon | 77.8% | Coming soon |
| Toolathlon Verified Pass@3 | Coming soon | 81.5% | Coming soon |
| Toolathlon Verified Pass³ | Coming soon | 73.1% | Coming soon |
| Toolathlon Verified avg. turns | Coming soon | 23.7 turns | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 85.0% | Coming soon |
| ApprenticeBench | Coming soon | 72% | Coming soon |
| CWE-bench v1 | Coming soon | 58.0% | Coming soon |
| MazeBench | Coming soon | 10% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Agents-A1 public-lane score: Coming soon
- Claude Fable 5.1 public-lane score: 76.8 (Supported · #3/150)

| Benchmark | Agents-A1 | Claude Fable 5.1 | Winner |
|-----------|-----------|-----------|--------|
| Bug Hunt Bench | Coming soon | 43.0 fixes | Coming soon |
| SWE-bench Pro | Coming soon | 81.2% | Coming soon |
| SWE Multilingual | Coming soon | 89.1% | Coming soon |
| SWE Multimodal | Coming soon | 54.7% | Coming soon |
| DeepSWE | Coming soon | 67.4% | Coming soon |
| FrontierSWE v2 | Coming soon | 56.3% | Coming soon |
| ProgramBench | Coming soon | 87.6% | Coming soon |
| CursorBench 3.2 | Coming soon | 73.4% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 90.5% | Coming soon |
| CursorBench 4.0 | Coming soon | 51.8% | Coming soon |
| PostTrainBench v1.1 | Coming soon | 40.2% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Agents-A1 public-lane score: 64.3 (Unranked · 1 rankable row)
- Claude Fable 5.1 public-lane score: 85.2 (#4/28)

| Benchmark | Agents-A1 | Claude Fable 5.1 | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | 60.2% | Coming soon | Coming soon |
| ARC-AGI-1 | Coming soon | 97.50% | Coming soon |
| ARC-AGI-2 | Coming soon | 90% | Coming soon |
| GraphWalks BFS 256K–1M | Coming soon | 65.0% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Agents-A1 public-lane score: Coming soon
- Claude Fable 5.1 public-lane score: 86.9 (Supported · #2/184)

| Benchmark | Agents-A1 | Claude Fable 5.1 | Winner |
|-----------|-----------|-----------|--------|
| HLE | 47.6% | 65% | Claude Fable 5.1 |
| HLE w/o tools | Coming soon | 60.9% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 93.4% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 92.4% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Agents-A1 public-lane score: Coming soon
- Claude Fable 5.1 public-lane score: Coming soon

| Benchmark | Agents-A1 | Claude Fable 5.1 | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 94.8% | Coming soon | Coming soon |
| Gray Swan IPI (15 attempts) | Coming soon | 1.0% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Agents-A1 public-lane score: Coming soon
- Claude Fable 5.1 public-lane score: 96.8 (Unranked · 2 rankable rows)

| Benchmark | Agents-A1 | Claude Fable 5.1 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | Coming soon | 90.175% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 87.805% | Coming soon |

## FAQ

### Is there enough evidence to pick between Agents-A1 and Claude Fable 5.1?

Not yet. The models share only 1 sourced benchmark row, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [Agents-A1 vs Agents-A1-F16-GGUF](/compare/agents-a1-vs-agents-a1-f16-gguf)
- [Claude Fable 5.1 vs Agents-A1-F16-GGUF](/compare/agents-a1-f16-gguf-vs-claude-fable-5-1)
- [Agents-A1 vs Agents-A1-FP8](/compare/agents-a1-vs-agents-a1-fp8)
- [Claude Fable 5.1 vs Agents-A1-FP8](/compare/agents-a1-fp8-vs-claude-fable-5-1)

## Explore More

- [Agents-A1 profile](/models/agents-a1)
- [Claude Fable 5.1 profile](/models/claude-fable-5-1)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)