ERNIE 4.5 vs GPT-5.1 Codex Comparison

Comparing ERNIE 4.5 and GPT-5.1 Codex across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

ERNIE 4.5 and GPT-5.1 Codex don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

ERNIE 4.5 costs less

For input processing, ERNIE 4.5 ($0.40/1M tokens) is 3.1x cheaper than GPT-5.1 Codex ($1.25/1M tokens).

For output processing, ERNIE 4.5 ($4.00/1M tokens) is 2.5x cheaper than GPT-5.1 Codex ($10.00/1M tokens).

In conclusion, GPT-5.1 Codex is more expensive than ERNIE 4.5.*

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

Lowest available price from all providers

Sat Mar 14 2026 • llm-stats.com

ERNIE 4.5

Input tokens$0.40

Output tokens$4.00

Best providerNovita

GPT-5.1 Codex

Input tokens$1.25

Output tokens$10.00

Best providerOpenAI

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Context Window

Maximum input and output token capacity

GPT-5.1 Codex accepts 400,000 input tokens compared to ERNIE 4.5's 128,000 tokens. GPT-5.1 Codex can generate longer responses up to 128,000 tokens, while ERNIE 4.5 is limited to 65,536 tokens.

ERNIE 4.5

Input128,000 tokens

Output65,536 tokens

GPT-5.1 Codex

Input400,000 tokens

Output128,000 tokens

Sat Mar 14 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-5.1 Codex supports multimodal inputs, whereas ERNIE 4.5 does not.

GPT-5.1 Codex can handle both text and other forms of data like images, making it suitable for multimodal applications.

ERNIE 4.5

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 4.5

Proprietary

Closed source

GPT-5.1 Codex

Proprietary

Closed source

Release Timeline

When each model was launched

ERNIE 4.5 was released on 2025-06-25, while GPT-5.1 Codex was released on 2025-11-19.

GPT-5.1 Codex is 5 months newer than ERNIE 4.5.

ERNIE 4.5

Jun 25, 2025

8 months ago

GPT-5.1 Codex

Nov 19, 2025

3 months ago

4mo newer

Knowledge Cutoff

When training data ends

GPT-5.1 Codex has a documented knowledge cutoff of 2024-09-30, while ERNIE 4.5'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 4.5's cutoff date.

ERNIE 4.5

—

GPT-5.1 Codex

Sep 2024

Provider Availability

ERNIE 4.5 is available from Novita. GPT-5.1 Codex is available from OpenAI. The availability of providers can affect quality of the model and reliability.