AI Model Watch
Models / OpenAI

GPT-5.3-Codex

Deprecated

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. DEPRECATED 2026-10-01: OpenAI's deprecations page added the section "2026-10-01: GPT-5.3-Codex, GPT-5.1, GPT-5.4-Nano" - "The following models are deprecated and will be removed from the API on April 1, 2027, with six months' notice. Migrate to the recommended replacements before the shutdown date." Table row: Apr 1, 2027 / gpt-5.3-codex / gpt-6-sol. The model page now carries a "Deprecated" badge on the model and on its single alias. The row is deprecated, not retired: the shutdown date is in the future and the model page still lists it with rates. Signal used: the dated deprecations-page section plus the model-page badge, both first-party; read 2026-10-03, two days after OpenAI's date.

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 deprecated, shutting down 1 Apr 2027; the recommended replacement is GPT-6 Sol.

Last verified: 24 Oct 2026 · sourced from official provider documentation

Retires on 1 Apr 2027 · deprecated since 1 Oct 2026

Lifecycle warning

This model is deprecated. Recommended migration: GPT-6 Sol.

Read the GPT-5.3-Codex migration guide → replacement & cheapest alternatives

Provider
OpenAI
Status
Deprecated
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 ↗

See also

Explore more

All OpenAI models→

Prices, context windows and lifecycle status for every OpenAI model we track.

Compare models head-to-head→

Side-by-side price, context and status for the models developers weigh against each other.

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 being deprecated or retired?

GPT-5.3-Codex is deprecated. Its scheduled shutdown date is 1 Apr 2027. The recommended migration is GPT-6 Sol.

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.