Inkling vs Seed 2.1 Pro: Specs & Benchmark Comparison
Inkling is developed by Thinking Machines Lab, while Seed 2.1 Pro comes from ByteDance. Seed 2.1 Pro was released in June 2026, and Inkling followed a month later in July 2026. Inkling has a published size of about 975 billion parameters; ByteDance has not disclosed the parameter count of Seed 2.1 Pro.
The two models share 4 published benchmarks. Seed 2.1 Pro leads on 4 of them. The widest gaps are on MMMU-Pro, where Seed 2.1 Pro scores 82.7% against 73.5%; CharXiv-R, where Seed 2.1 Pro scores 86.4% against 78.1%. Averaged across everything we track, Inkling sits at 61.8% and Seed 2.1 Pro at 63.7%.
Inkling is available through an API at $0.95 per million input tokens with a 524K-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 | Inkling | Seed 2.1 Pro |
|---|---|---|
| Company | Thinking Machines Lab | ByteDance |
| Release Date | July 21, 2026 | June 24, 2026 |
| Parameters | 975B | — |
| Multimodal | Yes | Yes |
| Context (input) | 524K | — |
| Context (output) | 524K | — |
| Input Price / 1M | $0.95 | — |
| Output Price / 1M | $4.05 | — |
| Average Score | 61.8% | 63.7% |
| Benchmarks | ||
| MMMU-Pro | 73.5% | 82.7% |
| CharXiv-R | 78.1% | 86.4% |
| MCP Atlas | 76.0% | 83.8% |
| Terminal-Bench 2.1 | 63.8% | 71.0% |
Visual Benchmark Comparison
Verdict
Inkling leads in 1 out of 2 comparison categories.
Both models show comparable average scores: Inkling — 0.6, Seed 2.1 Pro — 0.6.
Inkling is newer: released 7/21/2026 vs 6/24/2026.
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Frequently Asked Questions
Which is better for coding — Inkling or Seed 2.1 Pro?
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The Inkling 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 Inkling or Seed 2.1 Pro page. See also the complete list of AI model comparisons.