Models/OpenAI/GPT-5.3-Codex

GPT-5.3-Codex

Name: GPT-5.3-Codex API access
Brand: OpenAI

OpenAI · Proprietary · Released Feb 24, 2026 · openai/gpt-5.3-codex

Compare Estimate cost

400K contextVisionToolsReasoningStructured outputPrompt caching

Available from 3 providersUSD / MTOK · VERIFIED 4 MINUTES AGO

EST. MONTHLY COSTclick a row for detail · click headers to sort

PROVIDER	INPUT	OUTPUT	CACHE	CONTEXT	QUANT	TTFT	TPS	UPTIME
OpenAIopenai1ST PARTY	$1.75	$14.00	$0.175	400K	—	1.8s	323 tok/s	100.0%
Azure	$1.75	$14.00	$0.175	400K	—	2.6s	171 tok/s	100.0%
OpenAIopenai/priority1ST PARTY	$3.50	$28.00	$0.35	400K	—	—	—	100.0%

TTFT/TPS: median (P50) over trailing 72h · chat10k profile (~10K in / 200 out) · measured via OpenRouter routing · methodology v1.1 · measured 44 hours ago

Pricing variants · USD / MTok in / out

STANDARD

$1.75 / $14.00

per MTok in / out

CACHE READ $0.175WEB SEARCH $0.01 / search

About

GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...

Specifications

Context window400,000

Max output128,000

Modalities intext, image, file

Modalities outtext

LicenseProprietary

ReleasedFeb 24, 2026

TokenizerGPT

GPT-5.6 Luna Pro$0.10 / $0.60 GPT-5.6 Luna$0.10 / $0.60 GPT-5.6 Terra Pro$1.00 / $6.00 GPT-5.6 Terra$1.00 / $6.00

Embed badge

[![GPT-5.3-Codex](https://modelindex.ai/badge/openai/gpt-5.3-codex)](https://modelindex.ai/models/openai/gpt-5.3-codex)

Sources

OpenRouter API4 minutes ago

AGGREGATOR

LiteLLM dataset4 minutes ago

AGGREGATOR

ModelIndex benchmarks44 hours ago

MEASURED

Verified 4 minutes ago · list prices, not negotiated rates.