# Atria Dawn Preview vs GPT-5.3 Codex

> Side-by-side benchmark comparison for Atria Dawn Preview and GPT-5.3 Codex across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/atria-dawn-preview-vs-gpt-5-3-codex
- 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 GPT-5.3 Codex 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.
- GPT-5.3 Codex has the larger published context window at 400K.

## Model Snapshot

| Property | Atria Dawn Preview | GPT-5.3 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 | 64.37 |
| Benchmarks Covered | 13 | 8 |
| Pricing (input/output) | $0.00 / $0.00 | $1.75 / $14.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Atria Dawn Preview public-lane score: 57.9 (Estimated · #31/153)
- GPT-5.3 Codex public-lane score: 61.6 (Estimated · #15/153)

| Benchmark | Atria Dawn Preview | GPT-5.3 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% | 33.7% | Atria Dawn Preview |
| Terminal-Bench 2.0 | Coming soon | 77.3% | Coming soon |
| OSWorld-Verified | Coming soon | 64.7% | Coming soon |
| Gert Labs | Coming soon | 57.47% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Atria Dawn Preview public-lane score: 51.6 (Estimated · #51/152)
- GPT-5.3 Codex public-lane score: 62.1 (Estimated · #17/152)

| Benchmark | Atria Dawn Preview | GPT-5.3 Codex | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 78.3% | Coming soon | Coming soon |
| SWE-bench Pro | 59.6% | 56.8% | Atria Dawn Preview |
| SWE-bench Verified | Coming soon | 85% | Coming soon |
| SWE-Rebench | Coming soon | 58.2% | Coming soon |
| Vibe Code Bench | Coming soon | 61.77% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Atria Dawn Preview public-lane score: Coming soon
- GPT-5.3 Codex public-lane score: 75.6 (Unranked · 1 rankable row)

### Reasoning

- Winner: Insufficient shared evidence
- Atria Dawn Preview public-lane score: Coming soon
- GPT-5.3 Codex public-lane score: 78.3 (Unranked · 2 rankable rows)

### Knowledge

- Winner: Insufficient shared evidence
- Atria Dawn Preview public-lane score: Coming soon
- GPT-5.3 Codex public-lane score: 65.7 (Estimated · #23/183)

### Instruction Following

- Winner: Insufficient shared evidence
- Atria Dawn Preview public-lane score: Coming soon
- GPT-5.3 Codex public-lane score: 92.6 (#15/123)

## FAQ

### Is there enough evidence to pick between Atria Dawn Preview and GPT-5.3 Codex?

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 GPT-5.3-Codex-Spark](/compare/atria-dawn-preview-vs-gpt-5-3-codex-spark)
- [GPT-5.3 Codex vs GPT-5.3-Codex-Spark](/compare/gpt-5-3-codex-vs-gpt-5-3-codex-spark)
- [Atria Dawn Preview vs Claude Fable 5.1](/compare/atria-dawn-preview-vs-claude-fable-5-1)
- [GPT-5.3 Codex vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-gpt-5-3-codex)

## Explore More

- [Atria Dawn Preview profile](/models/atria-dawn-preview)
- [GPT-5.3 Codex profile](/models/gpt-5-3-codex)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)