Atria Dawn Preview vs Claude Opus 5.5: Specs & Benchmark Comparison
Atria Dawn Preview is developed by Shanghai AI Laboratory, while Claude Opus 5.5 comes from Anthropic. Both were released in September 2026. Atria Dawn Preview has a published size of about 744 billion parameters; Anthropic has not disclosed the parameter count of Claude Opus 5.5.
The two models share 2 published benchmarks. They split them evenly, 1 to 1. The widest gaps are on SWE-Bench Pro, where Claude Opus 5.5 scores 89.9% against 59.6%; AutomationBench, where Atria Dawn Preview scores 53.8% against 40.0%. Averaged across everything we track, Atria Dawn Preview sits at 72.7% and Claude Opus 5.5 at 71.1%.
Claude Opus 5.5 is available through an API at $4 per million input tokens with a 1M-token context window. We do not track a hosted API for Atria Dawn Preview, so pricing and context cannot be compared directly.
| Characteristic | Atria Dawn Preview | Claude Opus 5.5 |
|---|---|---|
| Company | Shanghai AI Laboratory | Anthropic |
| Release Date | September 11, 2026 | September 22, 2026 |
| Parameters | 744B | — |
| Multimodal | No | Yes |
| Context (input) | — | 1.0M |
| Context (output) | — | 128K |
| Input Price / 1M | — | $4.00 |
| Output Price / 1M | — | $20.00 |
| Average Score | 72.7% | 71.1% |
| Benchmarks | ||
| SWE-Bench Pro | 59.6% | 89.9% |
| AutomationBench | 53.8% | 40.0% |
Visual Benchmark Comparison
Verdict
Both models show equal results — the choice depends on your specific use case.
Both models show comparable average scores: Atria Dawn Preview — 0.7, Claude Opus 5.5 — 0.7.
Both models were released around the same time: 9/11/2026 and 9/22/2026.
More About These Models
Related Comparisons
Frequently Asked Questions
Which is better for coding — Atria Dawn Preview or Claude Opus 5.5?
Which model is cheaper — Atria Dawn Preview or Claude Opus 5.5?
Which has a larger context window — Atria Dawn Preview or Claude Opus 5.5?
The Atria Dawn Preview and Claude Opus 5.5 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Atria Dawn Preview or Claude Opus 5.5 page. See also the complete list of AI model comparisons.