GPT-5.4 vs GPT-5.3 Codex Comparison
Comparing GPT-5.4 and GPT-5.3 Codex across benchmarks, pricing, and capabilities.
Performance Benchmarks
Comparative analysis across standard metrics
GPT-5.4 outperforms in 2 benchmarks (OSWorld-Verified, SWE-Bench Pro), while GPT-5.3 Codex is better at 1 benchmark (Terminal-Bench 2.0).
GPT-5.4 shows notably better performance in the majority of benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
Cost data unavailable.
Context Window
Maximum input and output token capacity
Only GPT-5.4 specifies input context (1,000,000 tokens). Only GPT-5.4 specifies output context (128,000 tokens).
Input Capabilities
Supported data types and modalities
Both GPT-5.4 and GPT-5.3 Codex support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5.4
GPT-5.3 Codex
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
GPT-5.4 was released on 2026-03-05, while GPT-5.3 Codex was released on 2026-02-05.
GPT-5.4 is 1 month newer than GPT-5.3 Codex.
Mar 5, 2026
1 weeks ago
4w newerFeb 5, 2026
1 months ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Outputs Comparison
Key Takeaways
GPT-5.4
View detailsOpenAI
Detailed Comparison
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