GLM-5.1 vs Seed 2.1 Pro: Specs & Benchmark Comparison
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| Characteristic | GLM-5.1 | Seed 2.1 Pro |
|---|---|---|
| Company | Zhipu AI | ByteDance |
| Release Date | April 7, 2026 | June 24, 2026 |
| Parameters | 754B | — |
| Multimodal | No | Yes |
| Context (input) | 200K | — |
| Context (output) | 131K | — |
| Input Price / 1M | $1.40 | — |
| Output Price / 1M | $4.40 | — |
| Average Score | 0.9 | 0.6 |
Verdict
Seed 2.1 Pro leads in 1 out of 2 comparison categories.
Overall Performance
Both models show comparable average scores: GLM-5.1 — 0.9, Seed 2.1 Pro — 0.6.
Recency
Seed 2.1 Pro is newer: released 6/24/2026 vs 4/7/2026.
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Frequently Asked Questions
Which is better for coding — GLM-5.1 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 — GLM-5.1 or Seed 2.1 Pro?
API pricing data is available on the individual model pages.
Which has a larger context window — GLM-5.1 or Seed 2.1 Pro?
Context window data is available on the individual model pages.
The GLM-5.1 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 GLM-5.1 or Seed 2.1 Pro page. See also the complete list of AI model comparisons.