# Which AI model for which task? A practical cheat sheet

> **TL;DR:** **GPT-5** for structured writing, coding, careful reasoning. **Gemini** for long documents and research synthesis. **Grok 4** for news, voice, humor, image/video generation. **DeepSeek** for high-volume repetitive work. When in doubt, start with GPT-5 and switch when it feels slow, stiff, or stale. From the team shipping all four in [GO AI Chat](https://goaichat.app/chat); as of August 2026.

By the GO AI Team · August 21, 2026

## The cheat sheet

| Task | First pick | Backup |
|---|---|---|
| Reports, docs, structured writing | GPT-5 | Gemini |
| Punchy copy, hooks, social posts | Grok 4 | GPT-5 |
| Editing your draft | GPT-5 | Gemini |
| Summarizing long material | Gemini | GPT-5 |
| Coding — first attempt | GPT-5 | DeepSeek |
| Code review / second opinion | Grok 4 | DeepSeek |
| Math (ask for steps) | GPT-5 | DeepSeek |
| News & current events | Grok 4 | Gemini |
| Research synthesis | Gemini | GPT-5 |
| Translation drafts | Gemini | GPT-5 |
| Brainstorming | Grok 4 | DeepSeek |
| Voice conversation | Grok 4 | — |
| Image generation | Grok / Imagen 4 / OpenAI | — |
| Video generation (≤15s) | Grok | — |
| Bulk/repetitive prompts | DeepSeek | Gemini |

## One-line personalities

- **GPT-5** — the senior colleague: reliable, structured, occasionally over-cautious. Default starting point.
- **Gemini** — the researcher: hand it a pile of material, ask for sense.
- **Grok 4** — the fast friend who's always online: current, funny, multimodal; verify bold claims.
- **DeepSeek** — the efficient workhorse: unglamorous, capable, great at volume.

## Workflows that beat any single model

1. **Draft → restructure:** Grok 4 first draft → switch to GPT-5 in-thread: "keep the voice, fix the structure."
2. **Research → write:** Gemini digests sources → GPT-5 writes the deliverable.
3. **Build → review:** GPT-5 writes code → Grok 4 attacks it.

All three depend on mid-conversation model switching with context intact — the reason GO AI Chat is multi-model rather than another single-model wrapper.

**No model is good at (Aug 2026):** unverified citations, arithmetic hidden in prose, niche API details, anything where confident-wrong is expensive. Checking fixes it; model choice doesn't.

## FAQ

- **Best model overall?** No such thing; anyone naming one winner is selling something.
- **Best for writing?** GPT-5 structured · Grok 4 energetic · Gemini source-grounded.
- **Cheapest at volume?** DeepSeek. In GO AI Chat all four share one subscription.
- **Different apps per model?** No — GO AI Chat has all four with mid-conversation switching. [App Store](https://apps.apple.com/app/id6742322421)

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More: [Grok 4 vs GPT-5 in depth](https://goaichat.app/blog/grok-4-vs-gpt-5) · [GO AI Blog](https://goaichat.app/blog) · support@goaichats.com

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