Model Watch · Anthropic
Claude 5
6 models carry the Claude 5 name, 5 of them callable today. Here's what separates them, and what each one costs.
From Anthropic's own docs · updated 2026-09-05 10:32 UTC
The family started with Claude Fable 5 on 2026-06-09 and the newest is Claude Mythos 5.1 from 2026-09-01. Running one of these for a month costs anything from $5.12 on Claude Sonnet 5 to $26 on Claude Fable 5, for identical work.
Every Claude 5 model
| Model | Status | Released | Context | In / 1M | Out / 1M | Your month |
|---|---|---|---|---|---|---|
| Claude Mythos 5.1 | released | 2026-09-01 | 1M | $10.00 | $50.00 | $26 |
| Claude Fable 5.1 | released | 2026-09-01 | 1M | $10.00 | $50.00 | $26 |
| Claude Opus 5 | released | 2026-07-24 | 1M | $5.00 | $25.00 | $13 |
| Claude Sonnet 5 | released | 2026-06-30 | 1M | $2.00 | $10.00 | $5.12 |
| Claude Fable 5 | released | 2026-06-09 | 1M | $10.00 | $50.00 | $26 |
| Claude Opus 5.1 | rumoured | — | — | — | — | — |
The highlighted row is the newest one Anthropic has actually released. The monthly figure is 700 words in and 500 out, twenty times a day, at list prices. Change the workload.
Which one should you be using?
Claude Mythos 5.1 and Claude Fable 5.1 all shipped on 2026-09-01, which makes them the newest in the family between them. Newer is not automatically better for your job, but it is usually the one the lab is optimising, and on this table it is rarely the most expensive.
Why there are so many numbers
A point release is a new model, not a patch. Anthropic ships a new one under the same family name when the training or the tuning changes, and the old one usually keeps working at its old price until it's deprecated.
That's why two models in this table can hold the same amount of text and cost different amounts. You're picking a specific model, not a family, and the API name in each model's page is what actually goes in your code.
What each one is for
- Claude Mythos 5.1Same price as Fable 5.1 and same shape, but you can't just sign up for it. Anthropic gates Mythos behind an invite.
- Claude Fable 5.1Anthropic's top of the range, and priced like it. If Opus 5 already passes your evals you're paying double for nothing.
- Claude Opus 5Anthropic tells you to start here and only move up when your evals say you have to. Take the advice.
- Claude Sonnet 5The $2 and $10 was billed as introductory pricing until the end of August. Anthropic made it permanent instead, so the increase everyone budgeted for isn't coming.
- Claude Fable 5Still active, marked legacy. Same price as 5.1, so there's no reason to pin to it unless something in your prompts regressed.
- Claude Opus 5.1There is no Opus 5.1. Opus 5 shipped in July and the 5.1 generation went out as Fable and Mythos, so this entry exists to catch the name if it ever turns up.
Keep reading
Everything Anthropic has published · Anthropic prices in full · find a model by budget · compare any two