GPT-5.2 vs GPT-5.1 Codex Comparison
Comparing GPT-5.2 and GPT-5.1 Codex across benchmarks, pricing, and capabilities.
Performance Benchmarks
Comparative analysis across standard metrics
GPT-5.2 outperforms in 1 benchmarks (SWE-Bench Verified), while GPT-5.1 Codex is better at 0 benchmarks.
GPT-5.2 significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-5.2 ($1.75/1M tokens) is 1.4x more expensive than GPT-5.1 Codex ($1.25/1M tokens).
For output processing, GPT-5.2 ($14.00/1M tokens) is 1.4x more expensive than GPT-5.1 Codex ($10.00/1M tokens).
In conclusion, GPT-5.2 is more expensive than GPT-5.1 Codex.*
* Using a 3:1 ratio of input to output tokens
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.
Input Capabilities
Supported data types and modalities
Both GPT-5.2 and GPT-5.1 Codex support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5.2
GPT-5.1 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-5.2 was released on 2025-12-11, while GPT-5.1 Codex was released on 2025-11-19.
GPT-5.2 is 1 month newer than GPT-5.1 Codex.
Dec 11, 2025
3 months ago
3w newerNov 19, 2025
3 months ago
Knowledge Cutoff
When training data ends
GPT-5.2 has a knowledge cutoff of 2025-08-25, while GPT-5.1 Codex has a cutoff of 2024-09-30.
GPT-5.2 has more recent training data (up to 2025-08-25), making it potentially better informed about events through that date compared to GPT-5.1 Codex (2024-09-30).
Aug 2025
11 mo newerSep 2024
Provider Availability
GPT-5.2 is available from OpenAI. GPT-5.1 Codex is available from OpenAI. The availability of providers can affect quality of the model and reliability.
GPT-5.2
GPT-5.1 Codex
Outputs Comparison
Key Takeaways
GPT-5.2
View detailsOpenAI
Detailed Comparison
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