GPT-5.3 — OpenAI | Modeldex

GPT-5.3

Active

OpenAI GPT-5.3.

Updated 3 days agoStructured data from Modeldex catalog

Agentic

Not enough benchmark coverage yet for an Intelligence Index — needs at least 3 results across 2 categories.

History

GPT-5.3 is available from OpenAI.

Training & availability

OpenAI has not released the underlying model weights — access is via their hosted API only.

Capabilities

Input modalities: text.

Recommended for: agentic.

Limitations

Text-only — cannot process images, audio, or video inputs.

Quick start

Minimal example using the openai API. Copy, paste, replace the key.

from openai import OpenAI

client = OpenAI(api_key="sk-...")
resp = client.chat.completions.create(
    model="gpt-5-3",
    messages=[{"role": "user", "content": "Explain quantum computing in one sentence."}],
)
print(resp.choices[0].message.content)

Cost calculator

Estimate your monthly bill. Presets are typical workload sizes.

Input tokens / month5.0M

@ $1.75/1M

Output tokens / month2.0M

@ $14/1M

Input cost

$8.75

5.0M × $1.75/1M

Output cost

$28

2.0M × $14/1M

Total / month

$36.75

$441 / year

Integrations & tooling support

Tool calling: Supported
Structured outputs: Supported

Price vs quality

Premium pricing

Priced like a frontier model. Quality tier pending more benchmark coverage.

Quality percentile: —
Effective price: $10.94/1M
Pricing breakdown: $1.75/1M in
$14/1M out

Community ratings

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