GPT-5.3 Chat: API Pricing, Context Window & Benchmarks
GPT-5.3 Chat is a language model from OpenAI, released in March 2026, with multimodal input, a 128K-token context window, and pricing from $1.75/M input and $14.00/M output.
GPT-5.3 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. It supports streaming, function calling, and structured outputs, priced at
GPT-5.3 Chat benchmarks
Rankings
Quality Tracker
GPT-5.3 Chat Performance Across Datasets
Scores sourced from the model's scorecard, paper, or official blog posts
llm-stats.com - Sat Jul 25 2026GPT-5.3 Chat pricing
Providers
GPT-5.3 Chat starts at $1.75 per million input tokens and $14.00 per million output tokens via OpenAI.
| Provider | Input $/M | Output $/M | Context in / out | TTFT p50 / p95 s | Output avg / p5 c/s | Success 7d | Modalities in / out |
|---|---|---|---|---|---|---|---|
 OpenAI | $1.75 | $14.00 | 128.0K/16.4K | 1.54/1.54 | 387/387 | 100.00%(3) | / |
Cached input is the discounted price for prompt tokens served from a provider cache. TTFT is time to first token. Output is characters per second; p5 is the sustained floor exceeded by 95% of observed requests. Success is calculated from completed versus failed requests over the trailing seven days.
GPT-5.3 Chat context window
Input and output token limits for GPT-5.3 Chat, plus how it ranks on long-context understanding.
GPT-5.3 Chat API
Run a request to see the response
Use it in your code
Billed at $1.75 input / $14.00 output per 1M tokens through the LLM Stats gateway.
from openai import OpenAI
client = OpenAI(
api_key="YOUR_API_KEY",
base_url="https://gateway.llm-stats.com/v1"
)
response = client.chat.completions.create(
model="gpt-5.3-chat-latest",
messages=[
{"role": "user", "content": "What is machine learning?"}
]
)
print(response.choices[0].message.content)Need an API key? Create one above in the playground, or read the API documentation.
GPT-5.3 Chat latency
GPT-5.3 Chat time to first token, sustained output throughput, and failed-request rate from live API traffic over the trailing 7 days.
Provider operational metrics
Time to first token, output throughput, and failed-request rate from live API traffic
GPT-5.3 Chat examples
Recent arena outputs from GPT-5.3 Chat, picked from the highest-ranked matchups.
GPT-5.3 Chat license
GPT-5.3 Chat is a proprietary model available under its provider's product and API terms, has a knowledge cutoff of August 2025.
- License
- Proprietary
- Hosted access
- Knowledge cutoff
- August 2025
Proprietary license - usage restrictions apply
GPT-5.3 Chat resources
Official sources for GPT-5.3 Chat: api documentation, official playground.
GPT-5.3 Chat vs other models
The most-compared alternatives to GPT-5.3 Chat are GPT-5.5 Instant, GPT-5.6 Terra, GPT-5.6 Luna. Open any pair side-by-side for benchmarks, pricing, context, and latency.
Models like GPT-5.3 Chat
Models ranked just above and below GPT-5.3 Chat by LLM Stats score.
FAQ
Common questions about GPT-5.3 Chat.