GPT-5.3 Chat (latest) is an AI model by OpenAI. View detailed benchmark scores, pricing data, and performance metrics on Serenities AI Models.
Specifications last checked against the provider on . Benchmark scores carry their own source, linked beside each number.
Reasoning Benchmarks
Multi-turn service agent making tool calls under strict policy constraints
OpenRouter (measured)Cost Benchmarks
Context Benchmarks
Available from 6 providers
The same model costs different amounts depending on who serves it. You can bring your own key for 1 of these — connect it here.
| Provider | Input / 1M | Output / 1M | Cached in | Context | Your key |
|---|---|---|---|---|---|
| 302.AI | $1.75 | $14 | — | 128K | — |
| Abacus | $1.75 | $14 | — | 400K | — |
| Merge Gateway | $1.75 | $14 | $0.175 | 128K | — |
| OpenAI | $1.75 | $14 | $0.175 | 128K | Supported |
| Opper | $1.75 | $14 | $0.175 | 128K | — |
| ZenMux | $1.75 | $14 | — | 128K | — |
GPT-5.3 Chat (latest) — Benchmark Scores Overview
Scores normalized to percentage scale for visual comparison. ELO scores mapped to 0-100 range (1100-1500).
GPT-5.3 Chat (latest) — Frequently Asked Questions
How much does GPT-5.3 Chat (latest) cost?
GPT-5.3 Chat (latest) costs $1.8 per 1M input tokens and $14.0 per 1M output tokens. This is mid-range pricing for its capability level.
What is the context window of GPT-5.3 Chat (latest)?
GPT-5.3 Chat (latest) has a context window of 128K tokens. This determines how much text, conversation history, and code the model can process in a single request.
Who created GPT-5.3 Chat (latest)?
GPT-5.3 Chat (latest) was created by OpenAI. It is classified as a mid model in our catalogue.
Is GPT-5.3 Chat (latest) open source?
No, GPT-5.3 Chat (latest) is a proprietary model. It is available through OpenAI's API and compatible providers.