Claude Sonnet 5 Paid vs 
Seed 2.1 Turbo Paid
Claude Sonnet 5 vs Seed 2.1 Turbo compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.
Claude Sonnet 5 — full profile › · Seed 2.1 Turbo — full profile ›
Prices & specs refreshed from live data · olud.ai
Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.
$10 /M outputManaged API (no infra to run)
$2.5 /M outputManaged API (no infra to run)
Claude Sonnet 5 vs Seed 2.1 Turbo specs
| Spec | Claude Sonnet 5 | Seed 2.1 Turbo | Winner |
|---|---|---|---|
| Maker | Anthropic | ByteDance Seed | – |
| Type | Proprietary | Proprietary | – |
| Context window | 1M tokens | 262K tokens | |
| Input price | $2/M | $0.5/M | |
| Output price | $10/M | $2.5/M | |
| Vision / multimodal | Yes | Yes | = Tie |
| Tool / function calling | Yes | Yes | = Tie |
| Self-hostable | No (API only) | No (API only) | – |
| License | Proprietary | Proprietary | – |
Price gap & when to choose each
Seed 2.1 Turbo is ~4.0× cheaper than Claude Sonnet 5 on output tokens ($2.5 vs $10 per M tokens).
- You want frontier performance through a managed API
- You need the longer 1M context window
- You value reliability & ecosystem
- You don't want to manage infrastructure
- You want frontier performance through a managed API
- You want the lower output price
- You value reliability & ecosystem
- You don't want to manage infrastructure
Feature comparison
| Capability | Claude Sonnet 5 | Seed 2.1 Turbo |
|---|---|---|
| Open weights (downloadable) | ✗ | ✗ |
| Self-hostable | ✗ | ✗ |
| Runs fully offline | ✗ | ✗ |
| Vision / multimodal | ✓ | ✓ |
| Tool / function calling | ✓ | ✓ |
| 1M+ context window | ✓ | ✗ |
Benchmarks: Claude Sonnet 5 vs Seed 2.1 Turbo
Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).
Benchmark data by Artificial Analysis.
How Claude Sonnet 5 and Seed 2.1 Turbo score
| Criterion | Claude Sonnet 5 | Seed 2.1 Turbo |
|---|---|---|
| Cost-efficiency | 3.5 | 4.5 |
| Context window | 5.0 | 4.0 |
| Openness | 1.5 | 1.5 |
| Self-hosting | 1.0 | 1.0 |
| Multimodality | 5.0 | 5.0 |
Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.
What each model is
Claude Sonnet 5 Paid
Sonnet 5 is Anthropic's most capable Sonnet-class model, with frontier performance across coding, agents, and professional work. It supports adaptive thinking with selectable reasoning effort levels (low, medium, high, max,...
Seed 2.1 Turbo Paid
Seed 2.1 Turbo is a multimodal model from ByteDance Seed for coding and long-horizon agent workflows. It is suited for end-to-end software delivery, multi-step task execution, and understanding visual and...
Other models in these families
These variants are tracked but not compared here — one page per family keeps the comparison readable.
Frequently asked questions
Claude Sonnet 5 vs Seed 2.1 Turbo — which is cheaper?
Seed 2.1 Turbo is cheaper on output ($2.5/M vs $10/M).
Which has the larger context window?
Claude Sonnet 5 offers the larger context window (1M tokens).
Claude Sonnet 5 vs Seed 2.1 Turbo — which should I pick in 2026?
Choose Seed 2.1 Turbo for the lower output price ($2.5/M vs $10/M). Choose Claude Sonnet 5 if you need the larger 1M context window.
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