Claude Sonnet 4.5 vs ERNIE 5.1
Benchmark Performance
Available Benchmarks
| Benchmark | Claude Sonnet 4.5 | ERNIE 5.1 |
|---|---|---|
| LMArena Search Arenasearch-2026-08-24-011508720696 · arena_rating · leader | 1,158.4694% of row best · rating · claude-sonnet-4-5-search; 95% CI [1153.41447529, 1163.49714967]; votes 127378; rank 24 | 1,226.96100% of row best · rating · ernie-5.1; 95% CI [1217.24505738, 1236.67203321]; votes 3788; rank 6 |
| LMArena Text Arenatext-2026-09-01-011508720696 · arena_rating · leader | 1,433.9598% of row best · rating · claude-sonnet-4-5-20250929-high-32k; 95% CI [1431.13754052, 1436.75329939]; votes 81031; rank 79 | 1,468.10100% of row best · rating · ernie-5.1; 95% CI [1463.48233336, 1472.72453179]; votes 37137; rank 25 |
| Overall ResultCounted from the protocol-matched rows above | 0 benchmark wins | 2 benchmark winsOverall lead |
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 | Claude Sonnet 4.5 | ERNIE 5.1 |
|---|---|---|
| Developer | Anthropic | Baidu |
| Family | Claude 4 | Ernie 5 |
| Model | Claude Sonnet 4.5 | ERNIE 5.1 |
| Version | Claude Sonnet 4.5 | ERNIE 5.1 |
| Lifecycle | active | active |
| Released | 2025-09-29 | Unknown |
| Knowledge cutoff | 2025-01-01 | Unknown |
| Input modalities | Text, Image | Text |
| Output modalities | Text | Text |
| Context window | 200K | 131K |
| 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 | Anthropic (Standard) | Baidu Qianfan (Standard) |
| Capabilities | chat, generation, reasoning, structured_outputs, tools | agents, chat, reasoning, search, tools |
13 comparable fields · 8 material differences · Pair passes the primary-source comparison gate
Claude Sonnet 4.5 Capabilities
ERNIE 5.1 Capabilities
Internal Comparison Graph
Related Comparisons
| A | Pair | B | Context |
|---|---|---|---|
Claude Sonnet 4.5Anthropic | vs |  GPT-6 AstraOpenAI | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs | Claude Sonnet 4.5Anthropic | family variantsimage, text |
Claude Sonnet 4.5Anthropic | vs |  Gemini 3.1 ProGoogle DeepMind | cross-developer peerstext |
Claude Sonnet 4.5Anthropic | vs |  DeepSeek-V4-ProDeepSeek | cross-developer peerstext |
Claude Sonnet 4.5Anthropic | vs | Grok 4.6xAI | cross-developer peersimage, text |
Claude Sonnet 4.5Anthropic | vs |  Qwen3.8-MaxQwen | cross-developer peersimage, text |
Claude Sonnet 4.5Anthropic | vs |  Kimi-K3Moonshot AI | cross-developer peersimage, text |
 MiniMax-M3MiniMax | vs | Claude Sonnet 4.5Anthropic | cross-developer peersimage, text |
Claude Sonnet 4.5Anthropic | vs |  GLM-5.3Z.ai | cross-developer peerstext |
Claude Sonnet 4.5Anthropic | vs |  Hy4 previewTencent | cross-developer peerstext |
Claude Sonnet 4.5Anthropic | vs | Seed 2.1 ProByteDance Seed | cross-developer peersimage, text |
Claude Sonnet 4.5Anthropic | vs |  Mistral Large 3Mistral AI | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
Claude Sonnet 4.5 vs ERNIE 5.1 FAQs
Is Claude Sonnet 4.5 or ERNIE 5.1 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Sonnet 4.5 and ERNIE 5.1, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Sonnet 4.5 or ERNIE 5.1?+
Claude Sonnet 4.5 is $3.00 and ERNIE 5.1 is $4.00 per million tokens, so Claude Sonnet 4.5 is cheaper on this metric. Claude Sonnet 4.5 is $15.00 and ERNIE 5.1 is $18.00 per million tokens, so Claude Sonnet 4.5 is cheaper on this metric.
Which has a larger context window, Claude Sonnet 4.5 or ERNIE 5.1?+
Claude Sonnet 4.5 has the larger sourced context window. Claude Sonnet 4.5 supports 200K and ERNIE 5.1 supports 131K.
Which performs better in benchmarks, Claude Sonnet 4.5 or ERNIE 5.1?+
There is no overall benchmark winner: An overall winner requires at least two decisive benchmarks from at least two original publishers.
Can Claude Sonnet 4.5 or ERNIE 5.1 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Sonnet 4.5 is not marked open weight; ERNIE 5.1 is not marked open weight.
Can Claude Sonnet 4.5 and ERNIE 5.1 understand images?+
Claude Sonnet 4.5 is documented with image input; ERNIE 5.1 is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Sonnet 4.5 or ERNIE 5.1?+
ERNIE 5.1 has the larger sourced maximum output: Claude Sonnet 4.5 supports 64K and ERNIE 5.1 supports 66K output tokens.
Do Claude Sonnet 4.5 and ERNIE 5.1 support reasoning and tool use?+
Claude Sonnet 4.5: reasoning, tool calling, and image input. ERNIE 5.1: reasoning and tool calling. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Sonnet 4.5 or ERNIE 5.1?+
Claude Sonnet 4.5 has 1 sourced provider route; ERNIE 5.1 has 1, a tie.
Which offers better value, Claude Sonnet 4.5 or ERNIE 5.1?+
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.