OpenAI: GPT-5.3 Chat
The OpenAI GPT-5.3 Chat is designed to handle text, images, and files, with an impressive context length of 128,000 tokens and support for external tools. While it lacks reasoning capabilities and structured output options, its versatile input modalities make it suitable for a wide range of applications. Considering its price at $1.75 per million input tokens and $14.0 per million output tokens, this model is more expensive than some alternatives but offers strong performance with a blended benchmark score of 82.6 across various tests. For users who need robust handling of multiple data types and are willing to invest in higher-quality responses, GPT-5.3 Chat stands as a compelling choice despite its cost.
Benchmark results
Independent, published benchmarks. Blended score 82.6 across 1 benchmark, last refreshed 2026-07-27. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| EQ-Bench | emotional understanding in dialogue | 70.7 |
- Model ID
- openai/gpt-5.3-chat
- Vendor
- openai
- Released
- March 2026
- Tokenizer
- GPT
- Input Modalities
- text, image, file
- Output Modalities
- text
- Max Output
- 16,384 tokens
- Tool Calling
- ✓ supported
- Structured Output
- ✓ supported
- Reasoning Mode
- not supported
- Vision
- ✓ accepts images
- Audio
- no
- Moderated
- yes
What it costs in practice
Computed from the current $1.75/M input and $14.00/M output rates. Run your own numbers →
| Job | Tokens | Cost |
|---|---|---|
| Summarize a 50-page report | 30k in / 1.5k out | $0.07 |
| Classify 1,000 customer emails | 500k in / 50k out | $1.58 |
| A month of a busy support chatbot | 5M in / 2M out | $36.75 |
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Quick answers
- How much does OpenAI: GPT-5.3 Chat cost?
- $1.75 per million input tokens and $14.00 per million output tokens.
- What is OpenAI: GPT-5.3 Chat's context window?
- 128,000 tokens, roughly 192 pages of text in a single request.
- Does OpenAI: GPT-5.3 Chat support tool calling?
- It supports tool calling, structured output.
- Can OpenAI: GPT-5.3 Chat process images?
- Yes, it accepts image input.