Claude Sonnet 5 vs Seed 2.1 Pro: Specs & Benchmark Comparison
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| Characteristic | Claude Sonnet 5 | Seed 2.1 Pro |
|---|---|---|
| Company | Anthropic | ByteDance |
| Release Date | June 30, 2026 | June 24, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | — |
| Context (output) | 64K | — |
| Input Price / 1M | $2.00 | — |
| Output Price / 1M | $10.00 | — |
| Average Score | 0.6 | 0.6 |
| Benchmarks | ||
| OfficeQA Pro | 0.6 | 0.7 |
| SWE-Bench Pro | 0.6 | 0.6 |
| Toolathlon | 0.5 | 0.5 |
| CharXiv-R | 0.9 | 0.9 |
| Humanity's Last Exam | 0.6 | 0.6 |
| BrowseComp | 0.8 | 0.9 |
Visual Benchmark Comparison
Claude Sonnet 5
Seed 2.1 Pro
OfficeQA Pro0.6 vs 0.7
0.6
0.7
SWE-Bench Pro0.6 vs 0.6
0.6
0.6
Toolathlon0.5 vs 0.5
0.5
0.5
CharXiv-R0.9 vs 0.9
0.9
0.9
Humanity's Last Exam0.6 vs 0.6
0.6
0.6
BrowseComp0.8 vs 0.9
0.8
0.9
Verdict
Both models show equal results — the choice depends on your specific use case.
Overall Performance
Both models show comparable average scores: Claude Sonnet 5 — 0.6, Seed 2.1 Pro — 0.6.
Recency
Both models were released around the same time: 6/30/2026 and 6/24/2026.
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Frequently Asked Questions
Which is better for coding — Claude Sonnet 5 or Seed 2.1 Pro?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — Claude Sonnet 5 or Seed 2.1 Pro?
API pricing data is available on the individual model pages.
Which has a larger context window — Claude Sonnet 5 or Seed 2.1 Pro?
Context window data is available on the individual model pages.
The Claude Sonnet 5 and Seed 2.1 Pro comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude Sonnet 5 or Seed 2.1 Pro page. See also the complete list of AI model comparisons.