Model Comparison

ERNIE 5.0 vs GPT-5.1 CodexWhich is better in 2026?

Comparing ERNIE 5.0 and GPT-5.1 Codex across benchmarks, pricing, and capabilities.

Verdict: ERNIE 5.0 vs GPT-5.1 Codex — which is better?

ERNIE 5.0 (by Baidu) and GPT-5.1 Codex (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Choose ERNIE 5.0 if…

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

Choose GPT-5.1 Codex if…

  • you want predictable pricing at $1.25/M input and $10.00/M output
Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

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.

Arena Performance

Human preference votes

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
Wed Jun 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

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

4 months ago

2mo newer
GPT-5.1 Codex

Nov 19, 2025

7 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→

Key Takeaways

Baidu

No standout differentiators in the data we have for this pair.

OpenAI
Larger context window (400,000 tokens)

Detailed Comparison

AI Model Comparison Table
Feature
Baidu
ERNIE 5.0
OpenAI
GPT-5.1 Codex

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 (Baidu) and GPT-5.1 Codex (OpenAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

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.

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