# Atria Dawn Preview vs GPT-5.1-Codex

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

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

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: Atria Dawn Preview and GPT-5.1-Codex 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.
- Atria Dawn Preview has the lower published output-token price.
- GPT-5.1-Codex has the larger published context window at 400K.

## Model Snapshot

| Property | Atria Dawn Preview | GPT-5.1-Codex |
|----------|----------|----------|
| Creator | Shanghai Artificial Intelligence Laboratory | OpenAI |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 256K | 400K |
| Independent public score (not head-to-head) | null | 48.06 |
| Benchmarks Covered | 13 | 3 |
| Pricing (input/output) | $0.00 / $0.00 | $1.25 / $10.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Atria Dawn Preview public-lane score: 57.9 (Estimated · #31/153)
- GPT-5.1-Codex public-lane score: 48.7 (Estimated · #64/153)

| Benchmark | Atria Dawn Preview | GPT-5.1-Codex | Winner |
|-----------|-----------|-----------|--------|
| AutomationBench | 53.8% | Coming soon | Coming soon |
| 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% | 26.2% | Atria Dawn Preview |
| Gert Labs | Coming soon | 49.68% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Atria Dawn Preview public-lane score: 51.6 (Estimated · #51/152)
- GPT-5.1-Codex public-lane score: 44.9 (Estimated · #92/152)

| Benchmark | Atria Dawn Preview | GPT-5.1-Codex | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 78.3% | Coming soon | Coming soon |
| SWE-bench Pro | 59.6% | Coming soon | Coming soon |
| Vibe Code Bench | Coming soon | 13.12% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Atria Dawn Preview public-lane score: Coming soon
- GPT-5.1-Codex public-lane score: 66.8 (Unranked · 1 rankable row)

### Reasoning

- Winner: Insufficient shared evidence
- Atria Dawn Preview public-lane score: Coming soon
- GPT-5.1-Codex public-lane score: 68.6 (Unranked · 2 rankable rows)

### Knowledge

- Winner: Insufficient shared evidence
- Atria Dawn Preview public-lane score: Coming soon
- GPT-5.1-Codex public-lane score: 51.6 (Estimated · #70/183)

### Instruction Following

- Winner: Insufficient shared evidence
- Atria Dawn Preview public-lane score: Coming soon
- GPT-5.1-Codex public-lane score: 85.6 (#42/123)

## FAQ

### Is there enough evidence to pick between Atria Dawn Preview and GPT-5.1-Codex?

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

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

## Explore More

- [Atria Dawn Preview profile](/models/atria-dawn-preview)
- [GPT-5.1-Codex profile](/models/gpt-5-1-codex)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)