Kimi K3 vs Seed 2.1 Pro: Specs & Benchmark Comparison
Kimi K3 is developed by Moonshot AI, while Seed 2.1 Pro comes from ByteDance. Seed 2.1 Pro was released in June 2026, and Kimi K3 followed a month later in July 2026. Kimi K3 has a published size of about 2.8 trillion parameters; ByteDance has not disclosed the parameter count of Seed 2.1 Pro.
We have 3 benchmark results for Kimi K3 and 94 benchmark results for Seed 2.1 Pro, but they overlap on a single test: MathVision, where Kimi K3 scores 98.0% against 94.5%.
Kimi K3 is available through an API at $3 per million input tokens with a 1M-token context window. We do not track a hosted API for Seed 2.1 Pro, so pricing and context cannot be compared directly.
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| Characteristic | Kimi K3 | Seed 2.1 Pro |
|---|---|---|
| Company | Moonshot AI | ByteDance |
| Release Date | July 16, 2026 | June 24, 2026 |
| Parameters | 2.8T | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | — |
| Context (output) | 1.0M | — |
| Input Price / 1M | $3.00 | — |
| Output Price / 1M | $15.00 | — |
| Average Score | 95.7% | 63.7% |
| Benchmarks | ||
| MathVision | 98.0% | 94.5% |
Visual Benchmark Comparison
Verdict
Kimi K3 leads in 1 out of 2 comparison categories.
Both models show comparable average scores: Kimi K3 — 1.0, Seed 2.1 Pro — 0.6.
Kimi K3 is newer: released 7/16/2026 vs 6/24/2026.
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Frequently Asked Questions
Which is better for coding — Kimi K3 or Seed 2.1 Pro?
Which model is cheaper — Kimi K3 or Seed 2.1 Pro?
Which has a larger context window — Kimi K3 or Seed 2.1 Pro?
The Kimi K3 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 Kimi K3 or Seed 2.1 Pro page. See also the complete list of AI model comparisons.