Comparisons › Claude Fable 5.1 vs Claude Opus 5: which Claude should you pay for?

Claude Fable 5.1 vs Claude Opus 5: which Claude should you pay for?

Anthropic sells two frontier models at different prices. The premium one is not simply "better" — it is better at specific things, for twice the money.

Value verdict: on intelligence per $1, Claude currently comes out ahead — 13,250 vs 25,500. Prices move often, so recheck the calculator regularly.

At a glance

Model compared

Claude Fable 5.1	Claude Opus 5	Claude
Flagship model	Claude Fable 5.1	Claude Opus 5
Input / 1M	$10	$5
Output / 1M	$50	$25
Intelligence index	53	51
Tokens / $1	25.0k	50.0k
Intelligence / $1	13,250	25,500

Price

Claude Fable 5.1 is $10 / $50 per 1M tokens. Claude Opus 5 is $5 / $25. Output tokens — the ones that dominate agentic coding — cost exactly twice as much on Fable 5.1. Both are included in the Claude Pro and Max subscriptions, so plan users do not pay these rates directly.

Capability

Fable 5.1 sits at the top of the intelligence index and is the model practitioner rankings pick for one-shot capability and front-end design. Opus 5 is one step behind — still frontier, and the model most teams reach for when they need long, tool-heavy coding sessions without paying the premium tier.

When to pick which

Reach for Fable 5.1 when the deliverable is design-heavy, must land in one pass, or when a failed generation wastes real time. Stay on Opus 5 for sustained coding, long-context review and anything where you generate a lot of output per task. If you are unsure, start on Opus 5 and upgrade only the prompts where it falls short.

Bottom line: Fable 5.1 for one-shot, design-heavy work where quality compounds; Opus 5 for tooling-heavy and high-volume coding at half the price. Opus 5 is the safer default for most teams.