Model Comparison

GPT-5.2 vs GPT-5.3 Codex

GPT-5.3 Codex significantly outperforms across most benchmarks. GPT-5.2 and GPT-5.3 Codex cost the same.

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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

GPT-5.2 outperforms in 0 benchmarks, while GPT-5.3 Codex is better at 1 benchmark (SWE-Lancer (IC-Diamond subset)).

GPT-5.3 Codex significantly outperforms across most benchmarks.

Tue Apr 07 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-5.3 Codex costs less

For input processing, GPT-5.2 ($1.75/1M tokens) costs the same as GPT-5.3 Codex ($1.75/1M tokens).

For output processing, GPT-5.2 ($14.00/1M tokens) costs the same as GPT-5.3 Codex ($14.00/1M tokens).

In conclusion, GPT-5.2 and GPT-5.3 Codex cost the same.*

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

Lowest available price from all providers
Tue Apr 07 2026 • llm-stats.com
OpenAI
GPT-5.2
Input tokens$1.75
Output tokens$14.00
Best providerOpenAI
OpenAI
GPT-5.3 Codex
Input tokens$1.75
Output tokens$14.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Both models have the same input context window of 400,000 tokens. Both models can generate responses up to 128,000 tokens.

OpenAI
GPT-5.2
Input400,000 tokens
Output128,000 tokens
OpenAI
GPT-5.3 Codex
Input400,000 tokens
Output128,000 tokens
Tue Apr 07 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-5.2 and GPT-5.3 Codex support multimodal inputs.

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

GPT-5.2

Text
Images
Audio
Video

GPT-5.3 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.

GPT-5.2

Proprietary

Closed source

GPT-5.3 Codex

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.2 was released on 2025-12-11, while GPT-5.3 Codex was released on 2026-02-05.

GPT-5.3 Codex is 2 months newer than GPT-5.2.

GPT-5.2

Dec 11, 2025

3 months ago

GPT-5.3 Codex

Feb 5, 2026

2 months ago

1mo newer

Knowledge Cutoff

When training data ends

GPT-5.2 has a documented knowledge cutoff of 2025-08-25, while GPT-5.3 Codex's cutoff date is not specified.

We can confirm GPT-5.2's training data extends to 2025-08-25, but cannot make a direct comparison without GPT-5.3 Codex's cutoff date.

GPT-5.2

Aug 2025

GPT-5.3 Codex

—

Provider Availability

GPT-5.2 is available from OpenAI. GPT-5.3 Codex is available from OpenAI.

GPT-5.2

openai logo
OpenAI
Input Price:Input: $1.75/1MOutput Price:Output: $14.00/1M

GPT-5.3 Codex

openai logo
OpenAI
Input Price:Input: $1.75/1MOutput Price:Output: $14.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

OpenAI
OpenAI
Higher SWE-Lancer (IC-Diamond subset) score (81.4% vs 74.6%)

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-5.2
OpenAI
GPT-5.3 Codex

FAQ

Common questions about GPT-5.2 vs GPT-5.3 Codex

GPT-5.3 Codex significantly outperforms across most benchmarks. GPT-5.2 is made by OpenAI and GPT-5.3 Codex is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
GPT-5.2 scores AIME 2025: 100.0%, HMMT 2025: 99.4%, Tau2 Telecom: 98.7%, Graphwalks BFS <128k: 94.0%, GPQA: 92.4%. GPT-5.3 Codex scores SWE-Lancer (IC-Diamond subset): 81.4%, Cybersecurity CTFs: 77.6%, Terminal-Bench 2.0: 77.3%, OSWorld-Verified: 64.7%, SWE-Bench Pro: 56.8%.
Both models cost $1.75 per million input tokens.
GPT-5.2 supports 400K tokens and GPT-5.3 Codex supports 400K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.