ChatGPT 4o vs ChatGPT 4.1
OpenAI's two flagship models — fast versus deep. Pick the right tool for the job.
Fast, conversational multimodal flagship.
OpenAI's deeper-reasoning model.
TL;DR
4o is the daily driver — fast, conversational, multimodal. Use it 80% of the time.
4.1 is the heavy lifter — slower but deeper reasoning, better on long-form articles and complex analysis. Has a 1M-token context window vs 4o's 128K.
Side-by-side specs
| ChatGPT 4o | ChatGPT 4.1 | |
|---|---|---|
| Vendor | OpenAI | OpenAI |
| Context window | 128K tokens | 1M tokens |
| Image input | ✓ Yes | ✓ Yes |
| Voice mode | ✓ Yes | — No |
| Web search | — No | — No |
| Knowledge cutoff | Oct 2023 | May 2024 |
| Best for | Everyday questions, brainstorming, fast writing, coding snippets | Long-form articles, complex code review, nuanced reasoning |
| Available on AskAI.free | Free + Pro/Max on AskAI.free | Pro/Max on AskAI.free |
Winner by task
| Task | Winner | Why |
|---|---|---|
| Speed | ChatGPT 4o | Roughly 3x faster. |
| Multimodal (vision/voice) | ChatGPT 4o | 4.1 has vision but no voice mode. |
| Long documents (>200 pages) | ChatGPT 4.1 | 1M-token context wins by a mile. |
| Complex reasoning | ChatGPT 4.1 | Deeper analysis on hard problems. |
| Casual chat | ChatGPT 4o | Faster and friendlier by default. |
| Coding (snippets) | ChatGPT 4o | Faster for one-shot code help. |
| Coding (multi-file review) | ChatGPT 4.1 | Better at reasoning over a whole codebase. |
| Token cost (on AskAI.free) | ChatGPT 4o | 4.1 uses more tokens per question. |
Real-world use cases
Asking 'fix this code'
ChatGPT 4o. Fast enough; no reason to wait.
Reviewing a 200-page contract
ChatGPT 4.1. The 1M context window holds the whole document plus your prompt.
Drafting a long essay (>2000 words)
ChatGPT 4.1. Better narrative coherence over long output.
Brainstorming startup ideas
ChatGPT 4o. Conversational fluency wins.
Stop reading. Try both side-by-side on AskAI.free — your first question is free.
Start a free chat →Frequently asked questions
Should I always use 4.1 since it's smarter?
No. 4.1 is slower and burns more tokens. Use 4o for everything except long documents and hard reasoning.
What's the context window difference?
4o: 128K tokens. 4.1: 1M tokens — about 8x larger.
Are both included on AskAI.free Pro?
Yes — Pro and Max include both. Switch between them in the model picker.