ERNIE 5.1 vs Sonar Pro
Benchmark Performance
Available Benchmarks
| Benchmark | ERNIE 5.1 | Sonar Pro |
|---|---|---|
| LMArena Search Arenasearch-2026-08-24-011508720696 · arena_rating · leader | 1,226.96100% of row best · rating · ernie-5.1; 95% CI [1217.24505738, 1236.67203321]; votes 3788; rank 6 | 1,130.2192% of row best · rating · ppl-sonar-pro-high; 95% CI [1124.48384666, 1135.92956299]; votes 28519; rank 31 |
| Overall ResultCounted from the protocol-matched rows above | 1 benchmark winOverall lead | 0 benchmark wins |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Technical Differences
Side-by-Side Facts
| Field | ERNIE 5.1 | Sonar Pro |
|---|---|---|
| Developer | Baidu | Perplexity |
| Family | Ernie 5 | Sonar |
| Model | ERNIE 5.1 | Sonar Pro |
| Version | ERNIE 5.1 | Sonar Pro |
| Lifecycle | active | active |
| Released | Unknown | Unknown |
| Knowledge cutoff | Unknown | Unknown |
| Input modalities | Text | Text |
| Output modalities | Text | Text |
| Context window | 131,072 | 200,000 |
| 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 | Baidu Qianfan (Standard) | Openrouter (Standard), Perplexity (Standard) |
| Capabilities | agents, chat, reasoning, search, tools | chat, citations, search |
13 comparable fields · 7 material differences · Pair passes the primary-source comparison gate
ERNIE 5.1 Capabilities
Sonar Pro Capabilities
Internal Comparison Graph
Related Comparisons
| A | Pair | B | Context |
|---|---|---|---|
 ERNIE 5.1Baidu | vs | ERNIE X1.1Baidu | family variantstext |
 SonarPerplexity | vs | Sonar ProPerplexity | family variantstext |
Sonar ProPerplexity | vs | Sonar Reasoning ProPerplexity | family variantstext |
ERNIE 5.1Baidu | vs | Sonar Deep ResearchPerplexity | cross-developer peerstext |
ERNIE 5.1Baidu | vs | Sonar Reasoning ProPerplexity | cross-developer peerstext |
Sonar Deep ResearchPerplexity | vs | Sonar ProPerplexity | family variantstext |
ERNIE 5.1Baidu | vs |  GLM-5.3Z.ai | cross-developer peerstext |
ERNIE-4.5-0.3B-PTBaidu | vs | ERNIE 5.1Baidu | family variantstext |
ERNIE 5.1Baidu | vs |  Command ACohere | cross-developer peerstext |
ERNIE 5.1Baidu | vs | SonarPerplexity | cross-developer peerstext |
ERNIE 5.1Baidu | vs |  Hy4 previewTencent | cross-developer peerstext |
ERNIE 5.1Baidu | vs |  DeepSeek-V4-Flash-Vision-ExpDeepSeek | cross-developer peerstext |
Primary Evidence
Sources and Freshness
Questions
ERNIE 5.1 vs Sonar Pro FAQs
Is ERNIE 5.1 or Sonar Pro better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both ERNIE 5.1 and Sonar Pro, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, ERNIE 5.1 or Sonar Pro?+
ERNIE 5.1 is $4.00 and Sonar Pro is $3.00 per million tokens, so Sonar Pro is cheaper on this metric. ERNIE 5.1 is $18.00 and Sonar Pro is $15.00 per million tokens, so Sonar Pro is cheaper on this metric.
Which has a larger context window, ERNIE 5.1 or Sonar Pro?+
Sonar Pro has the larger sourced context window. ERNIE 5.1 supports 131,072 and Sonar Pro supports 200,000.
Which performs better in benchmarks, ERNIE 5.1 or Sonar Pro?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can ERNIE 5.1 or Sonar Pro be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. ERNIE 5.1 is not marked open weight; Sonar Pro is not marked open weight.
Can ERNIE 5.1 and Sonar Pro understand images?+
ERNIE 5.1 is not documented with image input; Sonar Pro is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, ERNIE 5.1 or Sonar Pro?+
Neither has a larger sourced maximum output. ERNIE 5.1 is 65,536 and Sonar Pro is —.
Do ERNIE 5.1 and Sonar Pro support reasoning and tool use?+
ERNIE 5.1: reasoning and tool calling. Sonar Pro: none of these features are definitively sourced. Feature support does not establish relative quality.
Which is available from more inference providers, ERNIE 5.1 or Sonar Pro?+
ERNIE 5.1 has 1 sourced provider route; Sonar Pro has 2, so Sonar Pro has broader tracked availability.
Which offers better value, ERNIE 5.1 or Sonar 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.