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Models / OpenAI

GPT-5.3-Codex

GA

Agentic coding model optimized for Codex. Reasoning effort low/medium/high/xhigh. Release date not stated on doc page. Cached-input price ($0.175) from pricing page.

GPT-5.3-Codex by OpenAI costs $1.75 per 1M input tokens and $14 per 1M output tokens ($4.81/1M blended), with a 400K (400.000-token) context window. It is generally available (GA), with a knowledge cutoff of 31 Aug 2025.

Last verified: 13 Aug 2026 · sourced from official provider documentation

Provider
OpenAI
Status
GA
Input price
$1.75 / 1M tokens
Output price
$14 / 1M tokens
Cached input
$0.175 / 1M tokens
Blended price
$4.81 / 1M tokens
Context window
400.000 tokens (400K)
Max output
128.000 tokens
Modality
text, image
Open weights
No — API only
Knowledge cutoff
2025-08-31
Released
—
API string
gpt-5.3-codex

Source: OpenAI official documentation ↗

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FAQ

GPT-5.3-Codex — questions & answers

How much does GPT-5.3-Codex cost?

GPT-5.3-Codex is priced at $1.75 per 1M input tokens and $14 per 1M output tokens ($4.81/1M blended at a 3:1 input-to-output ratio), with cached input at $0.175 per 1M tokens.

What is the context window of GPT-5.3-Codex?

GPT-5.3-Codex has a 400.000-token context window (400K), with up to 128.000 output tokens per request.

Is GPT-5.3-Codex deprecated?

No — GPT-5.3-Codex is generally available (GA) and not currently scheduled for deprecation or retirement in our tracker.

Does GPT-5.3-Codex support image or vision input?

Yes — GPT-5.3-Codex accepts image input. Listed modalities: text, image.

Can I self-host GPT-5.3-Codex?

No — GPT-5.3-Codex is proprietary. Its weights are not publicly released, so it is available only through OpenAI's API (or hosted partners), not for self-hosting.

What is the API model string for GPT-5.3-Codex?

The API model identifier for GPT-5.3-Codex is "gpt-5.3-codex" when calling OpenAI's API.

What is GPT-5.3-Codex's knowledge cutoff?

GPT-5.3-Codex's training knowledge cutoff is 31 Aug 2025.