OpenAIGPT-5.2 Codex
OpenAI's GPT-5.2-CODEX is a chat model capable of various tasks, including code completion, generation, and review, as well as reasoning and tool use. It excels in coding and general intelligence, with top 25% benchmark scores in the Intelligence Index and Coding Index, and a notably high score in GPQA, ranking in the top 10%.
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400K
Max Output
128K
Parameters
-
Technical Specifications
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Frequently asked questions about GPT-5.2 Codex
Answered from the entry's own fields: context, license, modalities, evidence, serving and the memory to self-host.
GPT-5.2 Codex advertises a context window of 400,000 tokens, with a maximum output of 128,000 tokens in a single response. The figure is the creator's published maximum; a given provider may serve less, and the gateway routes on what each provider actually serves.
No. GPT-5.2 Codex is a proprietary model (license: Proprietary): its weights are not distributed, and it runs only through OpenAI's own API or a provider licensed to serve it.
GPT-5.2 Codex accepts Text and Image and produces Text. The capabilities card on this page lists which API features each deployment honours, such as function calling and structured output, with the source each was checked against.
GPT-5.2 Codex has published results from Artificial Analysis, shown by suite in the benchmarks card above exactly as the publisher reported them. Scores are not combined across suites, and a suite that has not measured GPT-5.2 Codex is shown as not available rather than estimated.
Not on the managed pool today; GPT-5.2 Codex is listed for reference and comparison. Connect your own provider key or endpoint that serves it and the gateway runs it on your account, with routing decisions recorded the same way.
GPT-5.2 Codex cannot be self-hosted: its weights are not distributed. It is used through an API, either OpenAI's own or the Inferbase gateway where it is served.
Fields collected from public registries, provider APIs and benchmark publishers, each tagged with its source.
Last updated: Nov 3, 2026
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