LLM Reference
OpenRouter

Using GPT-5.3-Codex on OpenRouter

Implementation guide · Codex · OpenAI

Serverless

OpenRouter exposes GPT-5.3-Codex through model ID openai/gpt-5.3-codex. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-06-15. Next refresh: weekly.

Quick Start

  1. 1
    Create an account at OpenRouter and generate an API key.
  2. 2
    Use the OpenRouter SDK or REST API to call openai/gpt-5.3-codex — see the documentation for request format.
  3. 3
    You'll be billed $1.75/1M input, $14.00/1M output tokens. See full pricing.
API PortalDocumentationPricingModel Card

Code Examples

See OpenRouter documentation for integration details.

Pricing on OpenRouter

TypePrice (per 1M)
Input tokens$1.75
Output tokens$14.00

Capabilities

VisionReasoningJSON / Tool useStructured OutputsCode ExecutionPrompt CachingBatch API

About GPT-5.3-Codex

Most capable agentic coding model from OpenAI. Optimized for long-horizon, agentic coding tasks in the Codex CLI and API. Note: GPT-5.3-Codex-Spark is a distinct ChatGPT Pro research preview (not API-accessible).

Full model details →

Model Specs

Released2026-02-05
Context400k
ArchitectureDecoder Only
Knowledge cutoff2025-08

Also available on(2)

OpenAI API$1.75/1MVercel AI Gateway$1.75/1M
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Provider

OpenRouter
OpenRouter

OpenRouter, Inc.

New York, NY, USA