Seed 2.1 Pro vs Sonar Reasoning Pro
At a Glance
| Compare | Seed 2.1 ProByteDance Seed |  Sonar Reasoning ProPerplexity |
|---|---|---|
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | Not reported | $2.00Openrouter ↗ · Sep 22, 2026 |
| Output priceFrom · USD / 1M tokens | Not reported | $8.00Openrouter ↗ · Sep 22, 2026 |
| Context windowMaximum documented tokens | Not reported | 128K |
| Model facts checked | Sep 3, 2026View model evidence → | Aug 29, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
Available Benchmarks
Side-by-Side Facts
| Field | Seed 2.1 Pro | Sonar Reasoning Pro |
|---|---|---|
| Developer | ByteDance Seed | Perplexity |
| Family | Seed 2 1 | Sonar |
| Model | Seed 2.1 Pro | Sonar Reasoning Pro |
| Version | Seed 2.1 Pro | Sonar Reasoning Pro |
| Lifecycle | active | active |
| Released | 2026-06-23 | Unknown |
| Knowledge cutoff | Unknown | Unknown |
| Input modalities | Text, Image, Video | Text |
| Output modalities | Text | Text |
| Context window | Unknown | 128K |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Unknown | Openrouter (Standard), Perplexity (Standard) |
| Capabilities | agents, chat, computer-use, generation, reasoning, structured_outputs, tools | chat, citations, reasoning, search |
Seed 2.1 Pro Capabilities
Sonar Reasoning Pro Capabilities
Related Comparisons
All text comparisons →| A | Pair | B | Context |
|---|---|---|---|
Seed 2.1 ProByteDance Seed | vs |  GPT-6 AstraOpenAI | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs | Seed 2.1 ProByteDance Seed | cross-developer peersimage, text |
Seed 2.1 ProByteDance Seed | vs |  Gemini 3.1 ProGoogle DeepMind | cross-developer peerstext |
Seed 2.1 ProByteDance Seed | vs |  DeepSeek-V4.1-FlashDeepSeek | cross-developer peersimage, text |
Seed 2.1 ProByteDance Seed | vs | Grok 4.6xAI | cross-developer peersimage, text |
Seed 2.1 ProByteDance Seed | vs |  Qwen3.8-MaxQwen | cross-developer peersimage, text, video |
Seed 2.1 ProByteDance Seed | vs |  Kimi-K3Moonshot AI | cross-developer peersimage, text |
 MiniMax-M3MiniMax | vs | Seed 2.1 ProByteDance Seed | cross-developer peersimage, text |
Seed 2.1 ProByteDance Seed | vs |  GLM-5.3Z.ai | cross-developer peerstext |
Seed 2.1 ProByteDance Seed | vs |  Hy4 previewTencent | cross-developer peerstext |
Seed 2.1 ProByteDance Seed | vs |  Mistral Large 3Mistral AI | cross-developer peersimage, text |
Seed 2.1 ProByteDance Seed | vs | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
Seed 2.1 Pro vs Sonar Reasoning Pro FAQs
Is Seed 2.1 Pro or Sonar Reasoning Pro better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Seed 2.1 Pro and Sonar Reasoning Pro, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Seed 2.1 Pro or Sonar Reasoning Pro?+
Only Sonar Reasoning Pro has a directly sourced input price: $2.00 per million tokens. Only Sonar Reasoning Pro has a directly sourced output price: $8.00 per million tokens.
Which has a larger context window, Seed 2.1 Pro or Sonar Reasoning Pro?+
Neither model has a larger sourced context window in this comparison. Seed 2.1 Pro is — and Sonar Reasoning Pro is 128K.
Which performs better in benchmarks, Seed 2.1 Pro or Sonar Reasoning Pro?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can Seed 2.1 Pro or Sonar Reasoning Pro be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Seed 2.1 Pro is not marked open weight; Sonar Reasoning Pro is not marked open weight.
Can Seed 2.1 Pro and Sonar Reasoning Pro understand images?+
Seed 2.1 Pro is documented with image input; Sonar Reasoning Pro is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Seed 2.1 Pro or Sonar Reasoning Pro?+
Neither has a larger sourced maximum output. Seed 2.1 Pro is — and Sonar Reasoning Pro is —.
Do Seed 2.1 Pro and Sonar Reasoning Pro support reasoning and tool use?+
Seed 2.1 Pro: reasoning, tool calling, and image input. Sonar Reasoning Pro: reasoning. Feature support does not establish relative quality.
Which is available from more inference providers, Seed 2.1 Pro or Sonar Reasoning Pro?+
Seed 2.1 Pro has 0 sourced provider routes; Sonar Reasoning Pro has 2, so Sonar Reasoning Pro has broader tracked availability.
Which offers better value, Seed 2.1 Pro or Sonar Reasoning Pro?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.