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Claude Fable 5 vs Seed 2.1 Turbo
Claude Fable 5 (Anthropic) and Seed 2.1 Turbo (ByteDance Seed) compared on benchmarks, pricing, context window, and use-case rankings.
- Seed 2.1 Turbo is cheaper on input tokens — $0.50 vs $10.00 per 1M.
- Claude Fable 5 has a larger context window (1M vs 262K tokens).
| Attribute | Claude Fable 5 | Seed 2.1 Turbo |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 162 | — |
| Coding | 98 | — |
| Math | 97 | — |
| Reasoning & Knowledge | 90 | — |
| Agentic & Tools | 98 | — |
| Specifications | ||
| Developer | Anthropic | ByteDance Seed |
| Family | Claude | — |
| Released | Jun 9, 2026 | Aug 12, 2026 |
| Parameters | — | — |
| Availability | API access | — |
| Context window | 1M | 262K |
| Price — $/M input | $10.00 | $0.50 |
| Price — $/M output | $50.00 | $2.50 |
| Inputs | text, image, file | text, image, video |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 100% | — |
| APEX | 45% | — |
| ARC-AGI | 99% | — |
| ARC-AGI-2 | 89% | — |
| GPQA Diamond | 86% | — |
| Humanity's Last Exam | 56% | — |
| SciCode | 60% | — |
| SimpleBench | 82% | — |
| SimpleQA Verified | 68% | — |
| WebDev Arena | 1654 | — |
| WeirdML | 92% | — |
| τ²-bench | 99% | — |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Which is cheaper, Claude Fable 5 or Seed 2.1 Turbo?
Seed 2.1 Turbo is cheaper on input tokens at $0.50 per million, versus $10.00 (representative OpenRouter pricing).
Which has a larger context window, Claude Fable 5 or Seed 2.1 Turbo?
Claude Fable 5 supports up to 1M tokens, compared with 262K for the other.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.