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OpenAI model product

GPT-5.3

3 Chat is the instant model used in ChatGPT.

Updated Aug 12, 2026. Default version: GPT-5.3 Chat

Compare
LLMBoard score42.2GPT-5.3 Chat
Coverage20%2 benchmark families
Context window128KTokens
Official input price$1.75OpenAI API

On this page

  • Specification
  • Capability
  • Benchmarks
  • Arena
  • Runtime
  • Pricing
  • Versions
  • About
  • Compare
  • Similar models
  • FAQ

GPT-5.3 Specifications

Technical details for the model's default version.

Version
GPT-5.3 Chat
Released
Mar 4, 2026
Knowledge cutoff
Aug 31, 2025
Parameters
N/A
Context window
128K
Max output
16.4K
Inputs
image, text
Outputs
text
Open weights
No
License
Proprietary

GPT-5.3 Capability Profile

This profile uses the model's current scored version. Arena ratings and prices are shown separately.

GPT-5.3 Chat category scores

GPT-5.3 Benchmark Results

Benchmark scores for GPT-5.3 Chat.

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HealthBench Hard25.9%06937.5%CAug 11, 2026
HealthBench54.1%07925.0%CAug 11, 2026

GPT-5.3 Arena Results

Preference and agent-evaluation results for the default version.

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vision style controloverall571225.340,181N/AAug 6, 2026
visionoverall591231.740,181N/AAug 6, 2026
text style controloverall631448.732,875N/AAug 10, 2026
text style controloverall951426.631,701N/AAug 10, 2026
text factualityoverall1051422.37,765N/AAug 10, 2026
text factualityoverall1101418.732,682N/AAug 10, 2026
textoverall1291403.631,701N/AAug 10, 2026
textoverall1431387.732,875N/AAug 10, 2026

GPT-5.3 Runtime Performance

Provider-specific output speed and catalog latency for GPT-5.3 Chat. Runtime does not affect the capability score.

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OpenAI228.206 tok/s1.181 s128K16.4KAug 11, 2026

Output Speed is generated output tokens received per second. Catalog latency is reported separately from observed provider TTFT.

GPT-5.3 Pricing

Official vendor API pricing appears first, followed by individual provider offers.

Official API
$1.75 input, $14 output per 1M
Official provider
OpenAI
Lowest third-party
From $1.75 input, $14 output per 1M via ZenMux
Tracked offerings
5
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ZenMuxopenai/gpt-5.3-chatglobal$1.75$14128KAug 11, 2026
Abacusgpt-5.3-chat-latestglobal$1.75$14400KAug 11, 2026
OrcaRouteropenai/gpt-5.3-chat-latestglobal$1.75$14128KAug 11, 2026
Merge Gatewayopenai/gpt-5.3-chat-latestglobal$1.75$14128KAug 11, 2026
OpenAIgpt-5.3-chat-latestglobal$1.75$14128KAug 11, 2026

Official prices use only the vendor's configured official Provider and positive standard USD PAYG rates. Third-party offers remain explicitly labeled.

GPT-5.3 Versions

Available versions of this model. The score column identifies the version used in the overall ranking.

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GPT-5.3 ChatMar 4, 202642.2N/A128K16.4KNoProprietary

What is GPT-5.3?

Key information about GPT-5.3 and its available data.

3 Chat is the instant model used in ChatGPT. It features high intelligence with medium speed, supporting text and image inputs with a 128k context window. 00/1M output tokens.

Data as of 2026-08-11.

GPT-5.3 vs nearby models

Open a comparison with the three ranked models immediately above and below this model.

GPT-5.3vsQwen3 VL 235B A22BGPT-5.3vsNova 2 LiteGPT-5.3vsQwen3 235B A22BGPT-5.3vsCommand A+GPT-5.3vsGLM 4.5 AirGPT-5.3vsQwen3.5 9B

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FAQ

Common questions about GPT-5.3.

When was GPT-5.3 released?

GPT-5.3's default version was released on Mar 4, 2026.

How much does GPT-5.3 cost?

GPT-5.3's official API price is $1.75 per million input tokens and $14 per million output tokens via OpenAI. The lowest tracked third-party offer starts at $1.75 input and $14 output via ZenMux.

Who created GPT-5.3?

GPT-5.3 was created by OpenAI.

What is the context window for GPT-5.3?

The default version has a 128K token context window.

Is GPT-5.3 open weight?

No. The default version is not marked as having publicly available weights.

How many API providers offer GPT-5.3?

5 provider offerings are linked to the default version.

What models should I compare GPT-5.3 with?

Nearby ranked alternatives include Qwen3 VL 235B A22B, Nova 2 Lite, Qwen3 235B A22B.