Model Tracker
GPT-5.2-Codex
GPT-5.2-Codex is an AI model made by OpenAI. OpenAI released it on 18 December 2025. OpenAI retired it on 23 July 2026. Its context window is 400,000 tokens.
In inglese
GPT-5.2-Codex is an AI model made by OpenAI. OpenAI released it on 18 December 2025. OpenAI retired it on 23 July 2026. Its context window is 400,000 tokens. Its longest answer is 128,000 tokens. Through the API it costs $1.75 per 1M tokens for input and $14.00 per 1M tokens for output. Its knowledge cutoff is 31 August 2025.
- Released
- 18 December 2025 — openai.com, read 16 October 2026
- Status
- Not confirmed: two readings disagree: retired and ga
- Takes
- Not confirmed: two readings disagree: text, image and text, image, code
- Returns
- Not confirmed: two readings disagree: text and text, code
- Open weights
- Not confirmed: The cited OpenAI pages do not state whether GPT-5.2-Codex weights are open or downloadable.
- Licence
- Not confirmed: The cited OpenAI pages do not name a licence for GPT-5.2-Codex weights.
- Context window
- 400,000 tokens — developers.openai.com, read 16 October 2026
- Longest answer
- 128,000 tokens — developers.openai.com, read 16 October 2026
- Knowledge cutoff
- 31 August 2025 — developers.openai.com, read 16 October 2026
- API price, input
- $1.75 per 1M tokens — developers.openai.com, read 16 October 2026
- API price, output
- $14.00 per 1M tokens — developers.openai.com, read 16 October 2026
- Where
- API, Consumer app — openai.com, read 16 October 2026
- Parameters
- Not confirmed: The cited OpenAI pages do not publish a parameter count for GPT-5.2-Codex.
- Model card
- https://cdn.openai.com/pdf/ac7c37ae-7f4c-4442-b741-2eabdeaf77e0/oai_5_2_Codex.pdf — cdn.openai.com, read 16 October 2026
Benchmarks
Measured by others, not by the maker: each score with the name the measurer gives the model and the setting it ran, its day and its licence.
Arena
- Code Arena (WebDev), GPT-5.2-Codex: 1,339 (1,330–1,348, 6,721 votes), published 18 October 2026
Arena’s leaderboard dataset (lmarena-ai/leaderboard-dataset on Hugging Face), CC BY 4.0: ratings from people’s votes between two anonymous models, as Arena publishes them. Data · CC BY 4.0
Questions
When was GPT-5.2-Codex released?
OpenAI released GPT-5.2-Codex on 18 December 2025.
What is the context window of GPT-5.2-Codex?
The context window of GPT-5.2-Codex is 400,000 tokens, as OpenAI prints it.
How much does the GPT-5.2-Codex API cost?
On the standard tier, GPT-5.2-Codex costs $1.75 per 1M tokens for input and $14.00 per 1M tokens for output, as OpenAI lists it.
What is the knowledge cutoff of GPT-5.2-Codex?
The knowledge cutoff of GPT-5.2-Codex is 31 August 2025.
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Sources
- GPT-5.2-Codex Model | OpenAI API (read 16 October 2026)
- Introducing GPT-5.2-Codex (read 16 October 2026)
- Deprecations | OpenAI API (read 16 October 2026)
- Addendum to GPT-5.2 System Card: GPT-5.2-Codex (read 16 October 2026)