OpenAI: GPT-5.3 Chat
Analysis Summary
OpenAI: GPT-5.3 Chat sits in the Emerging tier on our leaderboard, ranked #339 of 556 published models on overall intelligence. At $1.75 input and $14.00 output per 1M tokens, it is among the most expensive on the market. It offers a standard large context window and supports tool use, function calling, vision, and reasoning.
Editorial notes
GPT-5.3 Chat from OpenAI offers vision, tool use, and function calling with a 128K context, but has no benchmark data to assess its reasoning or coding capability.
Assessed May 14, 2026
Rankings consider pricing, capabilities, benchmarks, and real-world applicability and are refreshed as new models launch. Feedback?
Performance Profile
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 emerging 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 ā refreshed every 30 minutes.
