OpenAI: GPT-5.3 Chat
Analysis Summary
GPT-5.3 Chat is OpenAI's conversational variant of the GPT-5.3 family, with vision, tool use, and function calling across a 128K context window. No benchmark data is available, so reasoning, coding, and instruction-following quality cannot be compared against the broader field.
For businesses, the lack of performance data makes it unsuitable for production or client-facing deployment without independent evaluation. The OpenAI provider reputation is a positive signal, but provider reputation alone does not substitute for measured capability.
At $1.75 input and $14.00 output per million tokens, the pricing is mid-to-high for an unverified model. Teams should consider benchmarked OpenAI alternatives until performance data for this variant is published.
Assessed June 6, 2026
Editorial notes
GPT-5.3 Chat from OpenAI has no benchmark data; vision, tool use, and function calling are present, but capability cannot be assessed without measured performance.
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
Performance Profile
How OpenAI: GPT-5.3 Chat compares
Its 128K-token context window is larger than 43% of the models we list. At $1.75 per million input tokens it is cheaper than 17% of comparable models.
About OpenAI: GPT-5.3 Chat
GPT-5.3 Chat is an update to ChatGPT's most-used model that makes everyday conversations smoother, more useful, and more directly helpful. It delivers more accurate answers with better contextualization and significantly..
Capabilities
How does OpenAI: GPT-5.3 Chat stack up?
Compare side-by-side with other legacy models.
Model Information
| OpenRouter ID |
openai/gpt-5.3-chat
|
| Provider | openai |
| Release Date | March 3, 2026 |
| Context Length | 128,000 tokens |
| Max Completion | 16,384 tokens |
| Status | Active |
Pricing
| Token Type | Cost per 1M tokens | Cost per 1K tokens |
|---|---|---|
| Input | $1.75 | $0.001750 |
| Output | $14.00 | $0.014000 |
Live Performance
Live endpoint metrics, refreshed every 30 minutes.
External Resources
Frequently asked questions about OpenAI: GPT-5.3 Chat
How much does OpenAI: GPT-5.3 Chat cost?
OpenAI: GPT-5.3 Chat costs $1.75 per million input tokens and $14.00 per million output tokens.
What is the context window of OpenAI: GPT-5.3 Chat?
OpenAI: GPT-5.3 Chat has a context window of 128,000 tokens (128K).
What can OpenAI: GPT-5.3 Chat do?
OpenAI: GPT-5.3 Chat supports image/vision input, tool use, and function calling.
Who created OpenAI: GPT-5.3 Chat?
OpenAI: GPT-5.3 Chat is developed by OpenAI and was released on March 3, 2026.
