Claude Opus vs Sonnet
Fable, Opus, Sonnet and Haiku: which Claude to use, and when.
Claude's four model families
From deepest to fastest, as Anthropic describes them.
| Family | Built for | Cost to run (newest version, per million tokens in / out) | On claude.ai |
|---|---|---|---|
 Fable | Demanding reasoning and long agent work | $10 / $50 (Fable 5.1) | Pro through usage credits; Max[1],[2] |
| Opus | Long-running coding and knowledge work | $4 / $20 (Opus 5.5) | Pro and up[1],[2] |
| Sonnet | The best mix of speed and intelligence | $2 / $10 (Sonnet 5.5) | Free and up[1],[3] |
| Haiku | The fastest answers | $1 / $5 (Haiku 4.5) | Free and up[1],[2] |
The Claude models in EverAsk
With the note EverAsk shows for each. Anthropic's September releases are not in EverAsk yet.
| Model | EverAsk's note |
|---|---|
| Claude Fable 5 | Frontier reasoning & agentic power. |
| Claude 5 Opus | Frontier agentic coding & enterprise work. |
| Claude 5 Sonnet | Frontier coding & agents, Sonnet speed. |
| Claude 4.5 Haiku | Our fastest, most concise model. |
Ask Opus and Sonnet the same thing
Each opens EverAsk Chat on that model with the same request ready.
Then put the answer to work
The same plan runs the agent behind the chat. It makes the files, not just the text, and works with Gmail, Slack and 40+ other apps.
Turn an answer into slides
A deck with real charts and speaker notes, ready to present or edit.
Write the document
Reports, proposals, contracts and invoices, formatted and ready to send.
Build the spreadsheet
Budgets, trackers and models that arrive built, filled in and charted.
Publish a website
A landing page or a full site, live on its own link from one request.
Make the images
Product shots, headshots and social posts from the top image models.
Research with sources
Deep research that reads the web for you and cites every claim.
EverAsk plans
Three plans, and Teams on top. The app shows each price in your currency when you choose a plan.
Standard
The agent in Flash and Pro modes, with two apps connected.
Flash + Pro
modes
Priced in the app, in your currency
Choose Standard- Flash and Pro modes
- 2 connected apps
- 2 scheduled tasks
- Docs, slides, sheets, websites, images and research
Pro
A monthly credit allowance, Ultra mode and more apps.
14K
credits a month
Priced in the app, in your currency
Choose Pro- Flash, Pro and Ultra modes
- 14K credits a month, with top-ups
- 5 connected apps
- 5 scheduled tasks
Ultra
The biggest allowance and every app.
70K
credits a month
Priced in the app, in your currency
Choose Ultra- Flash, Pro and Ultra modes
- 70K credits a month, with top-ups
- All 40+ apps
- 25 scheduled tasks
EverAsk for Teams: pooled credits and shared seats, from three seats. Talk to us
Common questions
What is the difference between Claude Opus and Sonnet?
Anthropic builds Opus for long, complex coding and knowledge work and Sonnet for the best mix of speed and intelligence. Opus costs about twice as much to run as Sonnet through Anthropic's API.
Where does Claude Fable fit?
Fable is Anthropic's model family for the most demanding reasoning and long agent tasks, above Opus. On claude.ai it is reached through paid usage credits on Pro, or the Max plans.
Is Opus better than Sonnet?
For the hardest coding and analysis, usually. For everyday writing and quick work, Sonnet is faster and often just as good. Try both on your own task.
Which Claude models are in EverAsk?
Claude Fable 5, Claude 5 Opus, Claude 5 Sonnet, Claude 4.8 Opus, 4.7 Opus, 4.6 Sonnet and 4.5 Haiku. Anthropic's September releases (Fable 5.1, Opus 5.5 and Sonnet 5.5) are not in EverAsk yet.
Is EverAsk made by Anthropic?
No. EverAsk is an independent product with Claude, GPT, Gemini, Grok and other models in one place. It is not affiliated with Anthropic.
Plans, prices and models change, so check each company's own site before you buy.
Ask your own question
The fastest way to choose is to try. Pick one model or two and ask.
Model and product names belong to their makers and are used here only to compare. EverAsk is not affiliated with Anthropic, OpenAI, Google, xAI, DeepSeek, Moonshot AI or Perplexity.
EverAsk on your phone and your Mac
EverAsk for iPhone
Ask Claude, GPT or Gemini on the train, switch models mid-chat, and pick the thread up on your phone. Every chat you start here is on your phone.
Download on the App Store
EverAsk for Mac
Every model on your desktop, with the files and screenshots you already have to hand.
Download for macOS