ERNIE 5.1 vs GPT-5 Nano
Benchmark Performance
Available Benchmarks
| Benchmark | ERNIE 5.1 | GPT-5 Nano |
|---|---|---|
| LMArena Text Arenatext-2026-09-01-011508720696 · arena_rating · leader | 1,468.10100% of row best · rating · ernie-5.1; 95% CI [1463.48233336, 1472.72453179]; votes 37137; rank 25 | 1,319.8490% of row best · rating · gpt-5-nano-high; 95% CI [1312.99438214, 1326.68844296]; votes 8128; rank 214 |
| 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 | GPT-5 Nano |
|---|---|---|
| Developer | Baidu | OpenAI |
| Family | Ernie 5 | Gpt 5 |
| Model | ERNIE 5.1 | GPT-5 Nano |
| Version | ERNIE 5.1 | GPT-5 Nano |
| Lifecycle | active | active |
| Released | Unknown | 2025-08-07 |
| Knowledge cutoff | Unknown | 2024-05-31 |
| Input modalities | Text | Text, Image |
| Output modalities | Text | Text |
| Context window | 131K | 400K |
| 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) | Openai (Standard), Openrouter (Standard) |
| Capabilities | agents, chat, reasoning, search, tools | chat, generation, reasoning, structured_outputs, tools |
13 comparable fields · 8 material differences · Pair passes the primary-source comparison gate
ERNIE 5.1 Capabilities
GPT-5 Nano Capabilities
Internal Comparison Graph
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|---|---|---|---|
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ERNIE 5.1Baidu | vs | Grok 4.6xAI | cross-developer peerstext |
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ERNIE 5.1Baidu | vs |  Kimi-K3Moonshot AI | cross-developer peerstext |
 MiniMax-M3MiniMax | vs | ERNIE 5.1Baidu | cross-developer peerstext |
ERNIE 5.1Baidu | vs |  GLM-5.3Z.ai | cross-developer peerstext |
ERNIE 5.1Baidu | vs |  Hy4 previewTencent | cross-developer peerstext |
ERNIE 5.1Baidu | vs | Seed 2.1 ProByteDance Seed | cross-developer peerstext |
ERNIE 5.1Baidu | vs |  Mistral Large 3Mistral AI | cross-developer peerstext |
Primary Evidence
Sources and Freshness
Questions
ERNIE 5.1 vs GPT-5 Nano FAQs
Is ERNIE 5.1 or GPT-5 Nano better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both ERNIE 5.1 and GPT-5 Nano, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, ERNIE 5.1 or GPT-5 Nano?+
ERNIE 5.1 is $4.00 and GPT-5 Nano is $0.025 per million tokens, so GPT-5 Nano is cheaper on this metric. ERNIE 5.1 is $18.00 and GPT-5 Nano is $0.20 per million tokens, so GPT-5 Nano is cheaper on this metric.
Which has a larger context window, ERNIE 5.1 or GPT-5 Nano?+
GPT-5 Nano has the larger sourced context window. ERNIE 5.1 supports 131K and GPT-5 Nano supports 400K.
Which performs better in benchmarks, ERNIE 5.1 or GPT-5 Nano?+
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 GPT-5 Nano be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. ERNIE 5.1 is not marked open weight; GPT-5 Nano is not marked open weight.
Can ERNIE 5.1 and GPT-5 Nano understand images?+
ERNIE 5.1 is not documented with image input; GPT-5 Nano is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, ERNIE 5.1 or GPT-5 Nano?+
GPT-5 Nano has the larger sourced maximum output: ERNIE 5.1 supports 66K and GPT-5 Nano supports 128K output tokens.
Do ERNIE 5.1 and GPT-5 Nano support reasoning and tool use?+
ERNIE 5.1: reasoning and tool calling. GPT-5 Nano: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, ERNIE 5.1 or GPT-5 Nano?+
ERNIE 5.1 has 1 sourced provider route; GPT-5 Nano has 2, so GPT-5 Nano has broader tracked availability.
Which offers better value, ERNIE 5.1 or GPT-5 Nano?+
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.