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GPT-5.3-Codex-Spark

EstablishedReleased Feb 12, 2026ProprietaryReasoning128K context

Released Feb 12, 2026 — see all recent releases

Decision reading
GPT-5.3-Codex-Spark is tracked, but not publicly ranked yet. The profile exposes 0 sourced benchmark rows and leaves unsupported fields blank until a published record exists.

Data as of September 10, 2026 · How the score is built

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Spec sheet

Each documented value carries its source. Missing fields stay visible as not sourced or not published, rather than disappearing from the page.

API model ID
Not published
Context window
128KOpenAI GPT-5.3 Codex Spark launch
Maximum output
Not sourced yet
Knowledge cutoff
Not sourced yet
Input modalities
textOpenAI GPT-5.3 Codex Spark launch
Output modalities
textOpenAI GPT-5.3 Codex Spark launch
Parameters
Not disclosed by the provider
Availability
Codex for ChatGPT Pro · API design-partner programOpenAI GPT-5.3 Codex Spark launch
Cloud regions
Not tracked yet
Lifecycle
research previewOpenAI GPT-5.3 Codex Spark launch
API capabilities
Tool calling, structured outputs, and batch support are not tracked yet
Prompt caching
Not documented in the pricing record
Self-host
Weights are not published
Rate limits
Not tracked yet

Lineage

The sequence follows explicit supersedes links. A successor's displayed score stays at least 0.1 points above its predecessor; raw benchmark rows do not move. Scores and prices remain blank when the corresponding public row or first-party rate is unavailable.

  1. Feb 12, 2026 · you are here

    GPT-5.3-Codex-Spark

    Not publicly ranked · Price not listed

Spark

GPT-5.3 CodexGPT-5.3 Codex · 64.3

How to read this profile

The visual layer above carries the decisions. These notes preserve the model, ranking, coverage, and family context behind the numbers.

We track GPT-5.3-Codex-Spark, but no weighted text-model benchmark result is published on the site yet. This page shows the metadata and separate protocol evidence we can verify now; a BenchLM score will appear only if compatible public evaluations land.

GPT-5.3-Codex-Spark is a proprietary model with a 128K context window. It uses an explicit reasoning mode, which can improve complex problem solving while adding latency and token use.

GPT-5.3-Codex-Spark sits in the GPT-5.3 Codex family with GPT-5.3 Codex. The profile has no source-displayable benchmark row yet.

Radar

GPT-5.3-Codex-Spark release history

Full release history

Radar confirmed these at the source. Use GPT-5.3-Codex-Spark in your work? Explore Radar to follow supported changes and choose your alerts.

Frequently asked questions

How does GPT-5.3-Codex-Spark perform overall in AI benchmarks?

GPT-5.3-Codex-Spark does not have any source-displayable benchmark rows yet, so this profile does not assign a public score or rank. Documented specifications remain visible, while score-led charts and claims stay unavailable until a published evaluation can be attached to the exact model.

Which sibling models are related to GPT-5.3-Codex-Spark?

GPT-5.3-Codex-Spark belongs to the GPT-5.3 Codex family. Related tracked variants include GPT-5.3 Codex. A sibling link indicates shared lineage or a documented configuration relationship; it does not mean the variants have identical pricing, context limits, benchmark evidence, or deployment behavior. Compare before switching.

Does GPT-5.3-Codex-Spark have full benchmark coverage on BenchLM?

No. GPT-5.3-Codex-Spark currently has 0 source-displayable rows across 428 tracked benchmark slots. The profile exposes published, non-generated evidence and leaves missing categories blank until an exact evaluation is available. Coverage describes how much was measured; it is not a penalty added to an individual benchmark result.

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

GPT-5.3-Codex-Spark has a documented context window of 128K. That figure is the maximum combined prompt and retained-conversation space reported for this exact model; it is not the maximum output length. The profile keeps output limits separate because providers often publish those limits independently.

Compare GPT-5.3-Codex-Spark with every tracked model412 comparisons

Last updated September 10, 2026. Runtime fields remain blank until a sourced snapshot exists.

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