GPT-5.3-Codex vs GPT-5.2-Codex: side-by-side summary

GPT-5.3-Codex and GPT-5.2-Codex are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

GPT-5.3-Codex, from OpenAI, has a 400,000-token context window and is priced at $1.75/M tokens input, $14/M tokens output on OpenRouter.

GPT-5.2-Codex, from OpenAI, has a 400,000-token context window and is priced at $1.75/M tokens input, $14/M tokens output on OpenRouter.

Context window

• GPT-5.3-Codex: 400,000 tokens
• GPT-5.2-Codex: 400,000 tokens

Price

• GPT-5.3-Codex: $1.75/M tokens input, $14/M tokens output
• GPT-5.2-Codex: $1.75/M tokens input, $14/M tokens output

Provided by

• GPT-5.3-Codex: OpenAI
• GPT-5.2-Codex: OpenAI

• GPT-5.3-Codex model details, providers and pricing
• GPT-5.2-Codex model details, providers and pricing