gpt-5.3-codex — API, Pricing & Context Window | Vivgrid

gpt-5.3-codex — API, Pricing & Context Window \| Vivgrid

gpt-5.3-codex on Vivgrid: OpenAI's Codex-tuned coding model on the Responses API, with a 400K context window and geo-distributed acceleration.

gpt-5.3-codex is OpenAI's Codex-optimized coding model, tuned for agentic software engineering: editing files, running tools, and iterating in a loop. It is served on the Responses API (/responses), the surface that Codex and similar coding CLIs expect.

With a 400K-token context window and geo-distributed acceleration across AMER and EMEA, it delivers low-latency, long-horizon coding sessions on Vivgrid through a single API key.

Specifications
Provider OpenAI
Model ID gpt-5.3-codex
Best for Coding
Context window 400,000 tokens
Max output 128,000 tokens
Modalities Text, Image
Tool / function calling Yes
Knowledge cutoff 2025-08
Acceleration ⚡ Geo-Distributed — AMER, EMEA

Pricing

Pricing in USD per 1M tokens, matching the provider's rates.

Input Cached input Output
$1.75 $0.175 $14.00

Quick start

Call gpt-5.3-codex through Vivgrid's unified, OpenAI-compatible endpoint. Get an API key from the Vivgrid Console.

curl https://api.vivgrid.com/v1/responses \
  -H "Authorization: Bearer $VIVGRID_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.3-codex",
    "input": "Refactor this function and explain the change.",
    "stream": true
  }'

Ideal use cases

Related models