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Head-to-head comparison

GPT-5.2 Chat vs GPT-5.3-Codex

GPT-5.2 Chat (OpenAI) and GPT-5.3-Codex (OpenAI) compared on the ModelCap Index, API price, context window, provider availability, weight access and every public benchmark board they share. Figures are the same ones shown on the live rankings; nothing here is a hidden score.

Snapshot as of 17 August 2026

As of 17 August 2026, GPT-5.2 Chat holds the stronger ModelCap Index position (#9 vs #20); and GPT-5.3-Codex offers the longer context window (400K vs 128K tokens).

Which should you choose?

Choose GPT-5.2 Chat if…

  • you want the stronger overall ModelCap Index position — #9 against #20 (74.9 vs 66.4 points).

Choose GPT-5.3-Codex if…

  • you need the longer context window — 400K tokens against 128K.
  • you want provider choice — 2 listed API providers against 1.
  • you want the more recently listed model — GPT-5.3-Codex was listed 24 February 2026, GPT-5.2 Chat 10 December 2025.

GPT-5.2 Chat vs GPT-5.3-Codex: specs, pricing and context

Specification comparison of GPT-5.2 Chat and GPT-5.3-Codex
FieldGPT-5.2 ChatOpenAIGPT-5.3-CodexOpenAI
ModelCap Index position#9#20
Index score74.966.4
EvidenceMeasuredMeasured
Input price / 1M tokens$1.75$1.75
Output price / 1M tokens$14.00$14.00
Context window128K tokens400K tokens
Max output tokens32K128K
API providers listed12
Weight accessAPI onlyAPI only
Input modalitiesFile, Image, TextText, Image, File
First listed10 December 202524 February 2026
PublisherOpenAIOpenAI

Evidence: 2 public benchmark observations across 2 boards · 1 public benchmark observation across 1 board. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: GPT-5.2 Chat vs GPT-5.3-Codex

Public benchmark boards where GPT-5.2 Chat or GPT-5.3-Codex has a published result
BoardGPT-5.2 ChatGPT-5.3-CodexLeads
Arena codingArena (LMArena)15151508–1522—Only one result
Artificial Analysis Intelligence IndexArtificial Analysis—45.5intelligence-indexOnly one result

Scores are the sources' own published figures for each model's best evaluated configuration; ModelCap never re-runs a benchmark.

Want a different pairing? Open the interactive comparison tool to swap either model for any current ranked language model.

GPT-5.2 Chat vs GPT-5.3-Codex: common questions

Is GPT-5.2 Chat better than GPT-5.3-Codex?

GPT-5.2 Chat ranks higher on the ModelCap Index as of 17 August 2026: #9 against #20. That is a capability ranking built from public benchmark evidence with published uncertainty; whether it is "better" for you also depends on price, context and where you can run it.

Is GPT-5.2 Chat cheaper than GPT-5.3-Codex?

Both list the same output price, $14.00/1M tokens, with input at $1.75/1M and $1.75/1M respectively.

Which has the bigger context window, GPT-5.2 Chat or GPT-5.3-Codex?

GPT-5.3-Codex has the larger context window: 400K tokens against 128K.

Which is better for coding, GPT-5.2 Chat or GPT-5.3-Codex?

The two models do not share a coding benchmark board on ModelCap yet, so no head-to-head coding score is published; the ModelCap Index position is the closest overall signal.

Are GPT-5.2 Chat and GPT-5.3-Codex open-weight models?

GPT-5.2 Chat: API only. GPT-5.3-Codex: API only. Open weights mean the checkpoint can be downloaded and self-hosted under its licence; API-only models are available solely through hosted endpoints.

Where can I run GPT-5.2 Chat and GPT-5.3-Codex?

ModelCap currently lists 1 API provider for GPT-5.2 Chat and 2 for GPT-5.3-Codex, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this GPT-5.2 Chat vs GPT-5.3-Codex comparison?

Every figure comes from the sealed ModelCap dataset published 17 August 2026; the page re-renders within a minute of each data refresh, and the ModelCap Index positions are the same ones shown on the live rankings.

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