ChatGPT vs Grok: which is better?
Updated:
A comparison of the flagship text models GPT-5.6 Sol and Grok 4.6 across intelligence, API price, and context window.
Grok and GPT by the numbers
Grok 4.6 and GPT-5.6 Sol are level on the Intelligence Index. For developers, the clearest differences are price and context size.
Intelligence Index
Grok 4.661
GPT-5.6 Sol61
Price
input / output per 1M tokens
Grok 4.6
$2 / $6
GPT-5.6 Sol
$5 / $30
Context
Grok 4.6500K
GPT-5.6 Sol1.05M
ChatGPT vs Grok: flagship model comparison
| Criterion | GPT-5.6 Sol | Grok 4.6 | Takeaway |
|---|---|---|---|
| Intelligence Index | 61 in max mode. | 61 in high mode. | The models are tied on the composite index. |
| API price | $5 input and $30 output per 1M tokens from OpenAI. | $2 input and $6 output per 1M tokens from xAI. | At official rates, Grok 4.6 costs less than GPT-5.6 Sol. |
| Context | 1.05M tokens. | 500K tokens. | GPT-5.6 Sol fits more text in one request. |
| Reasoning | Configurable reasoning effort up to max. | Configurable reasoning effort. | Both support complex multi-step work. |
Which one to choose
For maximum context — GPT-5.6 Sol
A 1.05M-token window helps when one request must contain an especially large codebase, document set, or history.
For lower cost — Grok 4.6
With a comparable Intelligence Index, Grok 4.6 officially costs $2 per 1M input and $6 per 1M output tokens.
For production — test both
One benchmark cannot decide every project. Quality on your data, context length, speed, and completed-task cost all matter.
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