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 reduces unnecessary…
Model details →OpenAI: GPT-5.3 Chat vs xAI: Grok 3
OpenAI: GPT-5.3 Chat wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
Grok 3 is the latest model from xAI. It's their flagship model that excels at enterprise use cases like data extraction, coding, and text summarization. Possesses deep domain knowledge in finance, healthcare, law, and science.
Model details →Side-by-side comparison
| Capability | OpenAI: GPT-5.3 Chat | xAI: Grok 3 | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 128K | 131K | 🏆 xAI: Grok 3 |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $1.75 | $3.00 | 🏆 OpenAI: GPT-5.3 Chat |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $14.00 | $15.00 | 🏆 OpenAI: GPT-5.3 Chat |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | — | 🏆 OpenAI: GPT-5.3 Chat |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | — | — | Tie |
Frequently asked questions
Is OpenAI: GPT-5.3 Chat better than xAI: Grok 3?
OpenAI: GPT-5.3 Chat wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between OpenAI: GPT-5.3 Chat and xAI: Grok 3?
Input: $1.75 vs $3.00 per 1M tokens. Output: $14.00 vs $15.00 per 1M tokens.
What context windows do OpenAI: GPT-5.3 Chat and xAI: Grok 3 support?
OpenAI: GPT-5.3 Chat supports up to 128K tokens. xAI: Grok 3 supports up to 131K tokens.
Do both OpenAI: GPT-5.3 Chat and xAI: Grok 3 support tool calling?
OpenAI: GPT-5.3 Chat: yes. xAI: Grok 3: yes.