The AI arena is free today

Open Superagent

ERNIE 5.0 vs GPT-5.1 Codex

ERNIE 5.0 and GPT-5.1 Codex are closely matched at 33.4 and 29.5 on the LLM Stats Score.

Baidu · OpenAI · Updated for 2026

Which is better?

ERNIE 5.0 and GPT-5.1 Codex are closely matched on the overall LLM Stats Score at 33.4 and 29.5.

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

Choose ERNIE 5.0

  • you want the most recent training data — it shipped Jan 2026

Choose GPT-5.1 Codex

  • you want predictable pricing at $1.25/M input and $10.00/M output

At a glance

The differences that matter most.

ERNIE 5.0
Baidu
GPT-5.1 Codex
OpenAI
Core performance indexes
LLM Stats Score
33.4
#99
29.5
#128
Reasoning
33.0
#99
29.7
#120
Cost, coverage & limits
Benchmark wins
—
—
Input price
— / M
$1.25 / M
Output price
— / M
$10.00 / M
Context window
—
400,000

Individual benchmarks

5 reported for ERNIE 5.0 · 3 for GPT-5.1 Codex

No common benchmarks found

ERNIE 5.0 and GPT-5.1 Codexdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only GPT-5.1 Codex specifies input context (400,000 tokens). Only GPT-5.1 Codex specifies output context (128,000 tokens).

Baidu
ERNIE 5.0
Input- tokens
Output- tokens
OpenAI
GPT-5.1 Codex
Input400,000 tokens
Output128,000 tokens
Fri Sep 18 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both ERNIE 5.0 and GPT-5.1 Codex support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

ERNIE 5.0

Text
Images
Audio
Video

GPT-5.1 Codex

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.

ERNIE 5.0

Proprietary

Closed source

GPT-5.1 Codex

Proprietary

Closed source

Release Timeline

When each model was launched

ERNIE 5.0 was released on 2026-01-22, while GPT-5.1 Codex was released on 2025-11-19.

ERNIE 5.0 is 2 months newer than GPT-5.1 Codex.

ERNIE 5.0

Jan 22, 2026

7 months ago

2mo newer
GPT-5.1 Codex

Nov 19, 2025

10 months ago

Knowledge Cutoff

When training data ends

GPT-5.1 Codex has a documented knowledge cutoff of 2024-09-30, while ERNIE 5.0's cutoff date is not specified.

We can confirm GPT-5.1 Codex's training data extends to 2024-09-30, but cannot make a direct comparison without ERNIE 5.0's cutoff date.

ERNIE 5.0

—

GPT-5.1 Codex

Sep 2024

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against ERNIE 5.0 and GPT-5.1 Codex side-by-side, then vote on the output you prefer.

ERNIE 5.0
✓ Preferred
GPT-5.1 Codex
Open in Playground

FAQ

Common questions about ERNIE 5.0 vs GPT-5.1 Codex.

Which is better, ERNIE 5.0 or GPT-5.1 Codex?

ERNIE 5.0 and GPT-5.1 Codex are closely matched on the LLM Stats Score at 33.4 and 29.5. ERNIE 5.0 is made by Baidu and GPT-5.1 Codex is made by OpenAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does ERNIE 5.0 compare to GPT-5.1 Codex in benchmarks?

ERNIE 5.0 scores AIME 2025: 87.0%, MMLU-Pro: 87.0%, GPQA: 85.0%, SimpleQA: 75.0%, Humanity's Last Exam: 39.0%. GPT-5.1 Codex scores SWE-Bench Verified: 73.7%, SWE-Lancer: 66.3%, Terminal-Bench 2.0: 52.8%.

What are the context window sizes for ERNIE 5.0 and GPT-5.1 Codex?

ERNIE 5.0 supports an unknown number of tokens and GPT-5.1 Codex supports 400K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between ERNIE 5.0 and GPT-5.1 Codex?

Key differences include LLM Stats Score (33.4 vs 29.5). See the full comparison above for benchmark-by-benchmark results.

Who makes ERNIE 5.0 and GPT-5.1 Codex?

ERNIE 5.0 is developed by Baidu and GPT-5.1 Codex is developed by OpenAI.

Related comparisons