GPT-5.3 Chat
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 $1.75/1M input and $14.00/1M output tokens.
Benchmark results
| Benchmark | Score | Tags | Source |
|---|---|---|---|
| HealthBench | 54.1% | self-reported llm-stats | link → |
| HealthBench Hard | 25.9% | self-reported llm-stats | link → |