claude-fable-5.1 vs claude-opus-5.5
Both can be used on onomeo. Everything below comes from calls made through this site.
- claude-fable-5.1
- 2 advantages
- claude-opus-5.5
- 2 advantages
How to choose
claude-fable-5.1Cheaper: about $0.018 a reply, 60% lessSteadier this week: 100% of tests passed
claude-opus-5.5Faster: 1.8s on averageHigher in this week's ranking: #47
claude-fable-5.1
By AnthropicNew this week
claude-opus-5.5
By Anthropic
Where they differ
claude-fable-5.1claude-opus-5.5
On this site
—Availability, last 3 days100%21 calls
100%3 testsAvailability, this week's tests97%43 tests
3.4sAverage response this week1.8s
$0.018Price per reply$0.044
#48Place in this week's ranking#47
$216.67Price per million characters$98.33
The model itself
1 Sep 2026Released22 Sep 2026
Where they match
- Context length1M tokens
- Longest reply128K tokens
- Reads imagesYes
- Calls toolsYes
- Thinks before answeringYes
- Conversations used for trainingUsed to train and improve the provider’s models
- Knowledge cutoffJun 2026
- Open weightsNo
Availability over 3 days counts every call made through the site; this week's availability counts every call over the last 7 days, scheduled tests included, and response time comes from the site's own scheduled tests. Free models are counted in calls; big models are charged by usage, in US dollars.
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claude-fable-5.1 against other models
Figures come from real calls made through this site. Models are served by third-party providers and may slow down or be withdrawn; this page follows those changes.