GPT-5.3 Instant released
OpenAI · Model release
Source confirmed
GPT-5.3 Instant
Released Mar 3, 2026 — see all recent releases
Decision reading
GPT-5.3 Instant 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 8, 2026 · How the score is built
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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
- gpt-5.3-chat-latestOpenAI GPT-5.3 Chat model documentation
- Context window
- 128KOpenAI GPT-5.3 Chat model documentation
- Maximum output
- Not sourced yet
- Knowledge cutoff
- Not sourced yet
- Input modalities
- text, imageOpenAI model catalog
- Output modalities
- textOpenAI model catalog
- Parameters
- Not disclosed by the provider
- Availability
- OpenAI APIOpenAI GPT-5.3 Chat model documentation
- Cloud regions
- Not tracked yet
- Lifecycle
- deprecatedOpenAI GPT-5.3 Chat model documentation
- 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.
Mar 3, 2026 · you are here
GPT-5.3 InstantNot publicly ranked · $1.75 / $14
Instant
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 Instant, 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 Instant 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.
The profile has no source-displayable benchmark row yet.
Radar
Full release historyGPT-5.3 Instant release history
Radar confirmed these at the source. Use GPT-5.3 Instant in your work? Explore Radar to follow supported changes and choose your alerts.
Frequently asked questions
How does GPT-5.3 Instant perform overall in AI benchmarks?
GPT-5.3 Instant 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.
Does GPT-5.3 Instant have full benchmark coverage on BenchLM?
No. GPT-5.3 Instant currently has 0 source-displayable rows across 427 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 Instant?
GPT-5.3 Instant 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 Instant with every tracked model411 comparisons
Last updated September 8, 2026. Runtime fields remain blank until a sourced snapshot exists.
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