Claude Fable 5.1 vs Seed 2.1 Pro: Specs & Benchmark Comparison
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| Characteristic | Claude Fable 5.1 | Seed 2.1 Pro |
|---|---|---|
| Company | Anthropic | ByteDance |
| Release Date | September 1, 2026 | June 24, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | — |
| Context (output) | 128K | — |
| Input Price / 1M | $10.00 | — |
| Output Price / 1M | $50.00 | — |
| Average Score | 0.6 | 0.6 |
| Benchmarks | ||
| Humanity's Last Exam | 0.7 | 0.6 |
Visual Benchmark Comparison
Claude Fable 5.1
Seed 2.1 Pro
Humanity's Last Exam0.7 vs 0.6
0.7
0.6
Verdict
Claude Fable 5.1 leads in 1 out of 2 comparison categories.
Overall Performance
Both models show comparable average scores: Claude Fable 5.1 — 0.6, Seed 2.1 Pro — 0.6.
Recency
Claude Fable 5.1 is newer: released 9/1/2026 vs 6/24/2026.
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Frequently Asked Questions
Which is better for coding — Claude Fable 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 — Claude Fable 5.1 or Seed 2.1 Pro?
API pricing data is available on the individual model pages.
Which has a larger context window — Claude Fable 5.1 or Seed 2.1 Pro?
Context window data is available on the individual model pages.
The Claude Fable 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 Claude Fable 5.1 or Seed 2.1 Pro page. See also the complete list of AI model comparisons.