GPT 5.3 Codex Spark

Input price

$1.75/1M tokens

Output price

$14/1M tokens

Capabilities

Show unsupported (7)

Infrastructure

Streaming

Details

Model IDgpt-5.3-codex-spark

ProviderOpenCode Zen

CreatorOpenAI

License—

Statusactive

Typechat

Input modalitiestext

Output modalitiestext

Open weight—

Parameters—

Architecture—

Context window—

Max input—

Max output—

Reasoning tokens—

Knowledge cutoff—

Release date—

Sourceofficial

Pricing

Input

$1.75

Output

$14

Cache write

—

Cache read

$0.18

Batch in

—

Batch out

—

Family Comparison: gpt-5.3

Model	Caps	Perf	Speed	Context	Max out	Pricing
GPT 5.3 Codex Spark	S	—	—	—	—	$1.75$14
GPT 5.3 Codex	RTJJMS	—	—	400K	128K	$1.75$14

API

GET/v1/models/opencode/gpt-5.3-codex-spark