# Atria Dawn Preview vs Claude Fable 5.1

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

- Canonical page: https://benchlm.ai/compare/atria-dawn-preview-vs-claude-fable-5-1
- Last updated: September 14, 2026

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: Atria Dawn Preview and Claude Fable 5.1 share only 2 sourced benchmark rows.

## Summary

- Only 2 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Atria Dawn Preview has the lower published output-token price.
- Claude Fable 5.1 has the larger published context window at 1M.

## Model Snapshot

| Property | Atria Dawn Preview | Claude Fable 5.1 |
|----------|----------|----------|
| Creator | Shanghai Artificial Intelligence Laboratory | Anthropic |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 256K | 1M |
| Independent public score (not head-to-head) | null | 84.62 |
| Benchmarks Covered | 13 | 26 |
| Pricing (input/output) | $0.00 / $0.00 | $10.00 / $50.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Atria Dawn Preview public-lane score: 57.9 (Estimated · #31/153)
- Claude Fable 5.1 public-lane score: 80.2 (Supported · #1/153)

| Benchmark | Atria Dawn Preview | Claude Fable 5.1 | Winner |
|-----------|-----------|-----------|--------|
| AutomationBench | 53.8% | 31.4% | Atria Dawn Preview |
| BFCL v4 | 77.0% | Coming soon | Coming soon |
| CyberGym | 86.5% | Coming soon | Coming soon |
| DeepSearchQA | 96.0% | Coming soon | Coming soon |
| BrowseComp | 92.5% | Coming soon | Coming soon |
| skillsBench | 66.4% | Coming soon | Coming soon |
| MLE-Bench Lite | 86.2% | Coming soon | Coming soon |
| WideResearch | 81.9% | Coming soon | Coming soon |
| τ³-bench results | 41.2% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 78.3% | Coming soon | Coming soon |
| JobBench | 50.3% | 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 |
| 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 |

### Coding

- Winner: Insufficient shared evidence
- Atria Dawn Preview public-lane score: 51.6 (Estimated · #51/152)
- Claude Fable 5.1 public-lane score: 84.3 (Supported · #1/152)

| Benchmark | Atria Dawn Preview | Claude Fable 5.1 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 78.3% | Coming soon | Coming soon |
| SWE-bench Pro | 59.6% | 81.2% | Claude Fable 5.1 |
| Bug Hunt Bench | Coming soon | 43 fixes | 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 |
| cursorBench32 | Coming soon | 73.4% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 90.5% | Coming soon |
| cursorBench40 | Coming soon | 51.8% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Atria Dawn Preview public-lane score: Coming soon
- Claude Fable 5.1 public-lane score: 79.4 (#2/20)

| Benchmark | Atria Dawn Preview | Claude Fable 5.1 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | Coming soon | 97.50% | Coming soon |
| ARC-AGI-2 | Coming soon | 90% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Atria Dawn Preview public-lane score: Coming soon
- Claude Fable 5.1 public-lane score: 86.7 (Supported · #1/183)

| Benchmark | Atria Dawn Preview | Claude Fable 5.1 | Winner |
|-----------|-----------|-----------|--------|
| HLE | Coming soon | 65% | Coming soon |
| 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 |

## FAQ

### Is there enough evidence to pick between Atria Dawn Preview and Claude Fable 5.1?

Not yet. The models share only 2 sourced benchmark rows, 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

- [Atria Dawn Preview vs Claude Fable 5](/compare/atria-dawn-preview-vs-claude-fable)
- [Claude Fable 5.1 vs Claude Fable 5](/compare/claude-fable-vs-claude-fable-5-1)
- [Atria Dawn Preview vs GPT-6 Astra](/compare/atria-dawn-preview-vs-gpt-6-astra)
- [Claude Fable 5.1 vs GPT-6 Astra](/compare/claude-fable-5-1-vs-gpt-6-astra)

## Explore More

- [Atria Dawn Preview profile](/models/atria-dawn-preview)
- [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)