How much does GPT-5 Codex cost per token?

GPT-5 Codex is priced at $0.63 per million input tokens and $5.00 per million output tokens, per OpenRouter as of Aug 21, 2026.

What is GPT-5 Codex's context window?

GPT-5 Codex supports a context window of up to 400K tokens, per OpenAI.

What are the alternatives to GPT-5 Codex?

By OpenRouter usage, comparable models include DeepSeek V4 Flash, Hy3, and Nemotron 3 Ultra. Side-by-side comparisons are linked in the alternatives table.

ModelsOpenAI

GPT-5 Codex

Name: GPT-5 Codex
Author: OpenAI

openrouter price docs

Context

400K

tokens

Released

Sep 23, 2025

on OpenRouter

Pricing

Price per million tokens

Input $/MTok

$0.6350%

OpenRouter · Aug 21, 2026

Output $/MTok

$5.0050%

OpenRouter · Aug 21, 2026

Cache read $/MTok

$0.063

OpenRouter

Current GPT-5 Codex prices per million tokens across tracked sources.
Source	Tracked slug	In $/MTok	Out $/MTok	Cache read	Cache write	Context	Effective	Last Δ (in)
OpenRouter	openai/gpt-5-codex:batch	$0.63	$5.00	$0.063	—	400K	Aug 21, 2026	50%
models.dev	orcarouter/openai/gpt-5-codex	$1.25	$10.00	$0.13	—	400K	Aug 21, 2026	11.1%

latest tracked price per source · Δ = most recent input-price move within that source

2 sources tracking

Input $/MTok

Output $/MTok

per-source step lines · $/MTok

history since Jul 8, 2026

Specs

Context & availability

GPT-5 Codex specifications.
Provider	OpenAI
Context window	400K tokens
Listed on OpenRouter	Sep 23, 2025
Tracked price sources	OpenRouter · models.dev
OpenRouter slugs	openai/gpt-5-codex

source: OpenRouter model catalog + tracked price feeds

id: gpt-5-codex

Usage

Share of OpenRouter tokens

90-day daily

usage share pending — this model isn't in the tracked OpenRouter model rankings yet

Benchmarks

Benchmark results

Benchmark scores for GPT-5 Codex.
Benchmark	Configuration	Score	Date	Source
no benchmark results attributed to GPT-5 Codex yet

scores as published by each benchmark; configurations differ — compare within a row's benchmark only

Alternatives

Similar models

Alternatives to GPT-5 Codex by OpenRouter usage-rank proximity.
#	Model	Tokens/day	7d Δ	Head-to-head
1	DeepSeek V4 FlashDeepSeek	2.7T	35.1%	vs GPT-5 Codex
2	Hy3Tencent	1.3T	12.2%	vs GPT-5 Codex
5	Nemotron 3 UltraNVIDIA	733B	83.5%	vs GPT-5 Codex
7	GLM 5.2Z.ai	533B	1.3%	vs GPT-5 Codex

ranked by OpenRouter usage-rank proximity

snapshot Aug 20, 2026

FAQ

GPT-5 Codex FAQ

How much does GPT-5 Codex cost per token?: GPT-5 Codex is priced at $0.63 per million input tokens and $5.00 per million output tokens, per OpenRouter as of Aug 21, 2026.
What is GPT-5 Codex's context window?: GPT-5 Codex supports a context window of up to 400K tokens, per OpenAI.
What are the alternatives to GPT-5 Codex?: By OpenRouter usage, comparable models include DeepSeek V4 Flash, Hy3, and Nemotron 3 Ultra. Side-by-side comparisons are linked in the alternatives table.

Alerts

Track GPT-5 Codex

Email me when GPT-5 Codex's price moves or it gets deprecated.