AI Model Use-Case Comparison

Task	Best Overall	Claude (Anthropic)				ChatGPT (OpenAI)			Gemini (Google)			Copilot (Microsoft)			Grok (xAI)
Task	Best Overall	Haiku 4.5 Cheapest	Sonnet 4.6 Balanced	Opus 4.8 Heavy	Fable 5 Flagship	Instant Default	Thinking Reasoning	Pro Heaviest	3.1 Flash-Lite Cheapest	3.5 Flash Balanced	3.1 Pro Heaviest	Smart Default	Think Deeper Reasoning	Deep Research Heaviest	Grok Build Cheapest	Grok 4.3 Balanced	4.20 Multi-Agent Heaviest
Coding
Quick code checkDebug / syntax / review	ClaudeSonnet 4.6Catches real bugs without flagship pricing	Skip Misses the subtler logic bugs	Sonnet ★ Finds logic errors and explains the fix in plain language	Skip More than a spot check needs	Skip Never for quick checks	Instant ★ Fast, free, and fine for syntax and small logic checks	Skip Save it for harder problems	Skip Not for spot checks	Skip 3.5 Flash reviews code better	3.5 Flash ★ Good review quality for the price	Skip Overkill	Smart ★ Decent quick reviews inside the tools you already use	Skip Overkill for spot checks	Skip It's a research agent, not a reviewer	Build ★ A coding model that costs very little	Fallback Works, but Build is cheaper for this	Skip Overkill for quick checks
Full app buildMulti-file, architecture	ClaudeOpus 4.8Tops the coding benchmarks; keeps big projects coherent	Skip Loses track across files	Fallback Good for scoped modules	Opus ★ 88.6% on SWE-bench Verified; the most reliable builder here	Upgrade if You run long unattended builds and the 2x price is fine	Skip Too light for this	Thinking ★ GPT-5.5 is a close second, and the best at terminal work	Upgrade if The architecture is genuinely hard	Skip Wrong tier	Fallback Capable, but expect some re-prompting on deep logic	3.1 Pro ★ Handles big codebases with its 1M-token window	Fallback Scoped builds only	Think Deeper ★ GPT-5.5 Thinking with your repo and docs in context	Skip Research agent, not a builder	Fallback Fine for small, scoped builds	Grok 4.3 ★ Grok's best option, though it trails the leaders on big builds	Skip More agents don't close the coding gap
Full web buildHTML / CSS / JS / layout	ClaudeOpus 4.8Layout, CSS, and accessibility handled in one pass	Skip Not reliable for responsive layouts	Fallback Good for single components	Opus ★ The strongest design instincts of any model here	Skip Opus already does this well	Skip Too light	Thinking ★ Ties front end and back end together well	Skip Rarely needed for web work	Skip Too light	3.5 Flash ★ Fast and surprisingly good at front-end code	Upgrade if The app is large or visually complex	Fallback Component-level work only	Think Deeper ★ Solid full-stack reasoning	Skip Wrong tool	Fallback Scoped components only	Grok 4.3 ★ Capable, less polished on CSS details	Skip Overkill
Writing
Quick social postsShort copy, captions	Gemini3.1 Flash-LiteCosts almost nothing; short copy doesn't need more	Haiku ★ Fast and easy on your quota	Skip More than you need	Skip Wasteful	Skip Never for captions	Instant ★ The free default handles short posts fine	Skip Overkill	Skip Not for captions	Flash-Lite ★ The cheapest option on this page, and captions don't need more	Skip Spends more than the job is worth	Skip Never for captions	Smart ★ Quick drafts in the apps you already use	Skip Overkill for captions	Skip Wrong tool	Skip It's a coding model	Grok 4.3 ★ Cheap, and it knows what's trending on X right now	Skip Never for captions
Long-form blog1,000 to 3,000+ words	ClaudeSonnet 4.6Holds your voice across thousands of words	Skip Voice drifts over long pieces	Sonnet ★ Matches your voice and keeps the thread from intro to close	Upgrade if The post needs expert-level synthesis	Skip Save the money for harder work	Skip Not reliable past a few hundred words	Thinking ★ GPT-5.5 writes noticeably better than earlier versions	Skip Not worth it for blogging	Skip Loses coherence	3.5 Flash ★ Decent drafts that tend to run long; trim after	Upgrade if You want research woven in as it writes	Smart ★ Fine if you draft in Word anyway	Upgrade if The piece is research-dense	Skip Wrong tool	Skip It's a coding model	Grok 4.3 ★ Solid writing, and current on live topics	Skip Overkill for blogging
Research and Strategy
Article researchSource synthesis, fact-finding	Gemini3.5 FlashGoogle Search built in, at low cost	Skip Too shallow for source work	Sonnet ★ Good with web search on, and honest about what it can't verify	Upgrade if Accuracy is high-stakes	Upgrade if It's a long, multi-source dig worth the premium	Skip Too light for research	Thinking ★ Deep Research mode does the legwork for you	Upgrade if The research feeds a big decision	Skip Not enough depth	3.5 Flash ★ Searches Google as it works and costs very little	Upgrade if You need academic-grade cross-referencing	Fallback Quick lookups only	Skip Deep Research is the better Copilot tool here	Deep Research ★ A dedicated research agent; strongest when your sources live in M365	Skip Wrong tool	Grok 4.3 ★ Live X and web data; good for fast-moving stories	Upgrade if It's a large multi-source job
Prompt engineeringBuild prompts for AI tools	ClaudeOpus 4.8Reasons about model behavior better than anything else	Skip Lacks the meta-reasoning	Fallback Fine for simpler prompts	Opus ★ Catches the failure modes you'd otherwise hit in production	Upgrade if The prompt drives an autonomous agent	Skip Not suited	Thinking ★ Precise instruction building	Upgrade if The prompt runs inside agentic workflows	Skip Wrong tier	Fallback Adequate for basic prompts	3.1 Pro ★ Works through prompt logic step by step	Fallback Basic prompt drafting	Think Deeper ★ Breaks down prompt structure and failure paths	Skip Wrong tool	Skip Not suited	Grok 4.3 ★ Decent, less sharp on edge cases	Fallback Several agents on one prompt, rarely worth it
Additional Common AI Use-Cases
Email draftingClient, internal, outreach	ClaudeHaiku 4.5Clean, professional, and cheap	Haiku ★ Clean professional drafts at the lowest Claude price	Upgrade if The email is tone-sensitive or high-stakes	Skip No reason to	Skip Definitely not	Instant ★ Reliable tone control on the free default	Upgrade if It's a tricky negotiation	Skip Never needed	Flash-Lite ★ Cheap and fine for routine mail	Upgrade if You're drafting in bulk with nuance	Skip Never for email	Smart ★ Drafts right inside Outlook	Upgrade if The email needs context from your files and meetings	Skip Wrong tool	Skip It's a coding model	Grok 4.3 ★ Capable, nothing special for email	Skip Never for email
Data analysisCSV, metrics, pattern-finding	Gemini3.1 ProReads huge datasets and runs its own analysis code	Skip Not enough for real inference	Fallback Surface-level patterns only	Opus ★ Strong on messy, ambiguous data	Upgrade if You want it to build and check a whole analysis on its own	Skip Not suited	Thinking ★ Handles big CSVs and multi-step interpretation	Upgrade if The analysis is genuinely hard	Skip Not suited	Fallback Quick structured summaries	3.1 Pro ★ Top reasoning scores, a huge context window, and it charts the results	Fallback OK when the data lives in Excel	Think Deeper ★ Excel agent mode with Python, and it can run Claude under the hood	Skip Wrong tool	Skip Not suited	Fallback Capable on clean data	Multi-Agent ★ Several agents on one dataset, but rivals reason better
Document summaryPDFs, contracts, reports	Gemini3.5 FlashReads up to a million tokens and summarizes fast	Skip Misses nuance in dense documents	Sonnet ★ Reliable extraction with a 1M-token window	Upgrade if It's a legal document needing judgment calls	Skip Summaries don't need a flagship	Skip Not suited	Thinking ★ Good at pulling what matters from long files	Upgrade if Legal interpretation required	Fallback Simple documents, nearly free	3.5 Flash ★ A million tokens of context at a mid-tier price	Upgrade if You're synthesizing several documents at once	Smart ★ Summarizes your own Word and SharePoint files where they live	Upgrade if The summary needs interpretation, not just extraction	Skip Wrong tool for single documents	Skip Wrong tool	Grok 4.3 ★ 1M-token window, handles long reports	Upgrade if Huge document sets; it reads 2M tokens
BrainstormingIdeas, concepts, angles	ChatGPTInstantFast, varied, and free	Fallback Ideas start repeating sooner	Sonnet ★ More variety, fewer clichés	Skip Depth isn't what brainstorming needs	Skip Definitely not	Instant ★ Rapid-fire ideas on the free default	Upgrade if You want strategy baked into the ideas	Skip Overthinks it	Flash-Lite ★ Quick concept lists at almost no cost	Upgrade if The brainstorm needs research behind it	Skip Overkill	Smart ★ Handy when ideas should draw on your work files	Skip Overthinks it	Skip Wrong tool	Skip It's a coding model	Grok 4.3 ★ Live X data helps with trend-driven ideas	Skip Never for ideation
SEO and metadataTitle tags, meta, alt text	Gemini3.1 Flash-LiteThe cheapest way to do metadata at scale	Haiku ★ Good with character limits	Skip Unnecessary	Skip Never for metadata	Skip Never for metadata	Instant ★ Handles bulk metadata fine	Skip Not needed	Skip Wasteful	Flash-Lite ★ Costs the least and follows structure rules reliably	Skip Overkill	Skip Never for metadata	Smart ★ Fast and fine for drafts	Skip Not needed	Skip Wrong tool	Fallback Cheap, and structured output suits it	Grok 4.3 ★ Low cost, handles structured output well	Skip Never for metadata
Strategic planningBusiness decisions, proposals	ClaudeOpus 4.8The best read on risks, tradeoffs, and edge cases	Skip Can't weigh competing variables	Fallback Lower-stakes planning	Opus ★ Surfaces the risks and edge cases others gloss over	Upgrade if The decision is big enough to justify the premium	Skip Not suited	Thinking ★ Strong tradeoff analysis	Upgrade if It's the hardest kind of strategy problem	Skip Not suited	Fallback Tactical planning only	3.1 Pro ★ Structured decision analysis with plenty of context room	Fallback When the plan draws on your org's data	Think Deeper ★ Deep reasoning with your company context loaded	Upgrade if The plan needs market research first	Skip Not suited	Fallback Capable, less thorough on edge cases	Multi-Agent ★ Several agents argue it out, but the leaders reason better solo
Automation workflowsAPIs, tools, logic chains	ClaudeOpus 4.8Runs long multi-step jobs without losing the plot	Skip Not for conditional logic at scale	Fallback Simple automations	Opus ★ The agentic workhorse; built for API chains and tool use	Upgrade if Agents run for hours or days unattended	Skip Not suited	Thinking ★ Conditional flows, API chains, error handling	Upgrade if Failure is expensive	Skip Not suited	3.5 Flash ★ Quick and agentic, with code execution built in	Upgrade if The logic is deeply nested	Fallback Power Automate basics	Think Deeper ★ Best for M365 agents; the new Cowork agent runs multi-step jobs	Skip Wrong tool	Fallback Good for API glue code	Fallback Capable, less proven for agents	Multi-Agent ★ Actually built as a team of agents