 GPT-5.3 Chat | ||
|---|---|---|
Model Provider The organization behind this AI's development | OpenAI | |
Input Context Window Maximum input tokens this model can process at once | 128K tokens | 65.5K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 16.4K tokens | 65.5K tokens |
Release Date When this model first became publicly available | March 3, 2026 2 months ago March 3rd, 2026 | March 12, 2025 1 year ago March 12th, 2025 |
GPT-5.3 Chat | Reka Flash 3 | |
|---|---|---|
Input Types Supported input formats | 📝Text🖼️Image📁File | 📝Text |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | GPT | Other |
Key Features Advanced capabilities | ✓Function Calling✓Structured OutputReasoning Mode✓Content Moderation | Function CallingStructured Output✓Reasoning ModeContent Moderation |
Open Source Model availability | Proprietary | Available on HuggingFace → |
| GPT-5.3 Chat | ||
|---|---|---|
Input Token Cost Cost per million input tokens | $1.75 per million tokens | $0.10 per million tokens |
Output Token Cost Cost per million outut tokens | $14.00 per million tokens | $0.20 per million tokens |
| GPT-5.3 Chat | ||
|---|---|---|
MMLU Measures knowledge across 57 subjects like law, math, history, and science | Benchmark not available. | Benchmark not available. |
MMMU Measures understanding of combined text and images across various domains | Benchmark not available. | Benchmark not available. |
HellaSwag Measures common sense reasoning by having models complete sentences about everyday situations | Benchmark not available. | Benchmark not available. |
GPT-5.3 Chat by OpenAI understands both text and images, can use external tools and APIs, generates structured data. It can handle standard conversations with its 128K token context window. Reasonably priced at $1.75/M input and $14.00/M output tokens. Includes built-in content moderation for safer outputs. Released March 3rd, 2026.Compare your models with top performers across different categories
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