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Claude Sonnet 5.5 vs ERNIE 5.5 Flash Preview

Claude Sonnet 5.5 and ERNIE 5.5 Flash Preview are closely matched at 57.0 and 52.3 on the LLM Stats Score. ERNIE 5.5 Flash Preview is 8.1x cheaper per token.

Anthropic · Baidu · Updated for 2026

Which is better?

Claude Sonnet 5.5 and ERNIE 5.5 Flash Preview are closely matched on the overall LLM Stats Score at 57.0 and 52.3.

The models split the 6 individual benchmarks reported for both models evenly.

On price, ERNIE 5.5 Flash Preview is roughly 8.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

ERNIE 5.5 Flash Preview also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Claude Sonnet 5.5

  • you want predictable pricing at $2.00/M input and $10.00/M output

Choose ERNIE 5.5 Flash Preview

  • cost matters — it's about 8.1x cheaper per token
  • you process long inputs — it offers a 1,048,576 token context window
  • you want the most recent training data — it shipped Nov 2026

At a glance

The differences that matter most.

Claude Sonnet 5.5
Anthropic
ERNIE 5.5 Flash Preview
Baidu
Core performance indexes
LLM Stats Score
57.0
#5
52.3
#13
Reasoning
55.7
#3
50.7
#12
Coding
46.2
#3
37.9
#20
Agents
42.0
#6
38.5
#11
Cost, coverage & limits
Benchmark wins
3 of 6
3 of 6
Input price
$2.00 / M
$0.28 / M
Output price
$10.00 / M
$1.13 / M
Context window
1,000,000
1,048,576

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Claude Sonnet 5.5
ERNIE 5.5 Flash Preview
Tool use
35.4#3
32.2#8
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

47 reported for Claude Sonnet 5.5 · 13 for ERNIE 5.5 Flash Preview

6 shared

Claude Sonnet 5.5 outperforms in 3 benchmarks (Humanity's Last Exam (no tools, text-only), Terminal-Bench 4.0, Terminal-Bench-Science 0.1), while ERNIE 5.5 Flash Preview is better at 3 benchmarks (AutomationBench, DeepSWE 1.1, OfficeQA Pro).

Both models are evenly matched across the benchmarks.

Thu Nov 12 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

ERNIE 5.5 Flash Preview costs less

For input processing, Claude Sonnet 5.5 ($2.00/1M tokens) is 7.1x more expensive than ERNIE 5.5 Flash Preview ($0.28/1M tokens).

For output processing, Claude Sonnet 5.5 ($10.00/1M tokens) is 8.8x more expensive than ERNIE 5.5 Flash Preview ($1.13/1M tokens).

In conclusion, Claude Sonnet 5.5 is more expensive than ERNIE 5.5 Flash Preview.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Thu Nov 12 2026 • llm-stats.com
Anthropic
Claude Sonnet 5.5
Input tokens$2.00
Output tokens$10.00
Best providerAnthropic
Baidu
ERNIE 5.5 Flash Preview
Input tokens$0.28
Output tokens$1.13
Best providerBaidu
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

ERNIE 5.5 Flash Preview accepts 1,048,576 input tokens compared to Claude Sonnet 5.5's 1,000,000 tokens. ERNIE 5.5 Flash Preview can generate longer responses up to 1,048,576 tokens, while Claude Sonnet 5.5 is limited to 128,000 tokens.

Anthropic
Claude Sonnet 5.5
Input1,000,000 tokens
Output128,000 tokens
Baidu
ERNIE 5.5 Flash Preview
Input1,048,576 tokens
Output1,048,576 tokens
Thu Nov 12 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Sonnet 5.5 supports multimodal inputs, whereas ERNIE 5.5 Flash Preview does not.

Claude Sonnet 5.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Sonnet 5.5

Text
Images
Audio
Video

ERNIE 5.5 Flash Preview

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude Sonnet 5.5

Proprietary

Closed source

ERNIE 5.5 Flash Preview

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Sonnet 5.5 was released on 2026-09-28, while ERNIE 5.5 Flash Preview was released on 2026-11-11.

ERNIE 5.5 Flash Preview is 1 month newer than Claude Sonnet 5.5.

Claude Sonnet 5.5

Sep 28, 2026

1 months ago

ERNIE 5.5 Flash Preview

Nov 11, 2026

1 days ago

1mo newer

Knowledge Cutoff

When training data ends

Claude Sonnet 5.5 has a documented knowledge cutoff of 2026-06-01, while ERNIE 5.5 Flash Preview's cutoff date is not specified.

We can confirm Claude Sonnet 5.5's training data extends to 2026-06-01, but cannot make a direct comparison without ERNIE 5.5 Flash Preview's cutoff date.

Claude Sonnet 5.5

Jun 2026

ERNIE 5.5 Flash Preview

—

Provider Availability

Claude Sonnet 5.5 is available from Anthropic. ERNIE 5.5 Flash Preview is available from Baidu Qianfan.

Claude Sonnet 5.5

anthropic logo
Anthropic
Input Price:Input: $2.00/1MOutput Price:Output: $10.00/1M

ERNIE 5.5 Flash Preview

baidu logo
Baidu
Input Price:Input: $0.28/1MOutput Price:Output: $1.13/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Claude Sonnet 5.5 and ERNIE 5.5 Flash Preview side-by-side, then vote on the output you prefer.

Claude Sonnet 5.5
✓ Preferred
ERNIE 5.5 Flash Preview
Open in Playground

FAQ

Common questions about Claude Sonnet 5.5 vs ERNIE 5.5 Flash Preview.

Which is better, Claude Sonnet 5.5 or ERNIE 5.5 Flash Preview?

Claude Sonnet 5.5 and ERNIE 5.5 Flash Preview are closely matched on the LLM Stats Score at 57.0 and 52.3. Claude Sonnet 5.5 is made by Anthropic and ERNIE 5.5 Flash Preview is made by Baidu. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Sonnet 5.5 compare to ERNIE 5.5 Flash Preview in benchmarks?

Claude Sonnet 5.5 scores BenchCAD (with Python tool): 96.3%, ArXivMath (with tools): 95.2%, Global-MMLU: 92.1%, MILU: 91.6%, SWE-bench Multilingual: 90.3%. ERNIE 5.5 Flash Preview scores BrowseComp: 87.4%, DRACO: 84.9%, MCP Atlas: 84.6%, DeepSWE 1.1: 71.2%, OfficeQA Pro: 67.9%.

Is Claude Sonnet 5.5 cheaper than ERNIE 5.5 Flash Preview?

ERNIE 5.5 Flash Preview is 7.1x cheaper for input tokens. Claude Sonnet 5.5 costs $2.00/M input and $10.00/M output via anthropic. ERNIE 5.5 Flash Preview costs $0.28/M input and $1.13/M output via baidu.

What are the context window sizes for Claude Sonnet 5.5 and ERNIE 5.5 Flash Preview?

Claude Sonnet 5.5 supports 1.0M tokens and ERNIE 5.5 Flash Preview supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Sonnet 5.5 and ERNIE 5.5 Flash Preview?

Key differences include LLM Stats Score (57.0 vs 52.3), context window (1.0M vs 1.0M), input pricing ($2.00 vs $0.28/M), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Sonnet 5.5 and ERNIE 5.5 Flash Preview?

Claude Sonnet 5.5 is developed by Anthropic and ERNIE 5.5 Flash Preview is developed by Baidu.

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