ERNIE 5.1 vs Sonar Reasoning Pro
At a Glance
| Compare |  ERNIE 5.1Baidu |  Sonar Reasoning ProPerplexity |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v4.4 | #12 of 5773.5 score · 1/3 sources · single-source provisional · missing LiveBench, ARC-AGI-2 · full-core range 24.5–91.2 | UnrankedNot in the 57-model eligible cohort |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | Not reported | $2.00Openrouter ↗ · Oct 19, 2026 |
| Output priceFrom · USD / 1M tokens | Not reported | $8.00Openrouter ↗ · Oct 19, 2026 |
| Context windowMaximum documented tokens | 131K | 128K |
| Model facts checked | Aug 29, 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
| Benchmark | ERNIE 5.1 | Sonar Reasoning Pro |
|---|---|---|
| LMArena Search Arenasearch-2026-10-13-0ebb411abf00 · arena_rating · leader | 1,226.72100% of row best · rating · ernie-5.1; 95% CI [1217.24341628, 1236.18668968]; votes 4024; rank 11 | 1,139.0193% of row best · rating · ppl-sonar-reasoning-pro-high; 95% CI [1133.19180048, 1144.81939817]; votes 29439; rank 37 |
| Overall ResultCounted from the protocol-matched rows above | 1 benchmark winNo overall winner | 0 benchmark winsNo overall winner |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Side-by-Side Facts
| Field | ERNIE 5.1 | Sonar Reasoning Pro |
|---|---|---|
| Developer | Baidu | Perplexity |
| Family | Ernie 5 | Sonar |
| Model | ERNIE 5.1 | Sonar Reasoning Pro |
| Version | ERNIE 5.1 | Sonar Reasoning Pro |
| Lifecycle | active | active |
| Released | Unknown | Unknown |
| Knowledge cutoff | Unknown | Unknown |
| Input modalities | Text | Text |
| Output modalities | Text | Text |
| Context window | 131K | 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 | Baidu Qianfan (Standard) | Openrouter (Standard), Perplexity (Standard) |
| Capabilities | agents, chat, reasoning, search, tools | chat, citations, reasoning, search |
ERNIE 5.1 Capabilities
Sonar Reasoning Pro Capabilities
Related Comparisons
All text comparisons →| A | Pair | B | Context |
|---|---|---|---|
ERNIE 5.1Baidu | vs | Sonar ProPerplexity | cross-developer peerstext |
ERNIE 5.1Baidu | vs |  Solar Pro 4Upstage | cross-developer peerstext |
ERNIE-4.5-0.3B-PTBaidu | vs | ERNIE 5.1Baidu | family variantstext |
ERNIE 5.1Baidu | vs | ERNIE X1.1Baidu | family variantstext |
ERNIE 5.1Baidu | vs |  Command ACohere | cross-developer peerstext |
ERNIE 5.1Baidu | vs | Command A ReasoningCohere | cross-developer peerstext |
ERNIE 5.1Baidu | vs |  Antigravity AgentGoogle DeepMind | cross-developer peerstext |
ERNIE 5.1Baidu | vs | Gemma 4 E2BGoogle DeepMind | cross-developer peerstext |
ERNIE 5.1Baidu | vs |  Devstral-2-123B-Instruct-2512Mistral AI | cross-developer peerstext |
ERNIE 5.1Baidu | vs | SonarPerplexity | cross-developer peerstext |
ERNIE 5.1Baidu | vs | Sonar Deep ResearchPerplexity | cross-developer peerstext |
Primary Evidence
Sources and Freshness
Questions
ERNIE 5.1 vs Sonar Reasoning Pro FAQs
Is ERNIE 5.1 or Sonar Reasoning Pro better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both ERNIE 5.1 and Sonar Reasoning 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 Reasoning Pro?+
ERNIE 5.1 is $4.00 and Sonar Reasoning Pro is $2.00 per million tokens, so Sonar Reasoning Pro is cheaper on this metric. ERNIE 5.1 is $18.00 and Sonar Reasoning Pro is $8.00 per million tokens, so Sonar Reasoning Pro is cheaper on this metric.
Which has a larger context window, ERNIE 5.1 or Sonar Reasoning Pro?+
ERNIE 5.1 has the larger sourced context window. ERNIE 5.1 supports 131,072 tokens and Sonar Reasoning Pro supports 128,000 tokens.
Which performs better in benchmarks, ERNIE 5.1 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 ERNIE 5.1 or Sonar Reasoning Pro be self-hosted?+
Both models have the same sourced self-hosting status: unsupported. ERNIE 5.1 is not marked open weight; Sonar Reasoning Pro is not marked open weight.
Can ERNIE 5.1 and Sonar Reasoning Pro understand images?+
ERNIE 5.1 is not 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, ERNIE 5.1 or Sonar Reasoning Pro?+
ERNIE 5.1 has a sourced maximum output of 65,536 tokens; Sonar Reasoning Pro's maximum output is not reported. A larger limit cannot be determined.
Do ERNIE 5.1 and Sonar Reasoning Pro support reasoning and tool use?+
ERNIE 5.1: reasoning and tool calling. Sonar Reasoning Pro: reasoning. Feature support does not establish relative quality.
Which is available from more inference providers, ERNIE 5.1 or Sonar Reasoning Pro?+
ERNIE 5.1 has 1 sourced provider route; Sonar Reasoning Pro has 2, so Sonar Reasoning Pro has broader tracked availability.
Which offers better value, ERNIE 5.1 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.