claude-opus-5.5 vs claude-sonnet-5.5
Both can be used on onomeo. Everything below comes from calls made through this site.
- claude-opus-5.5
- No edge in the figures
- claude-sonnet-5.5
- 3 advantages
How to choose
claude-opus-5.5No edge in the figures
claude-sonnet-5.5Cheaper: about $0.0037 a reply, 92% lessSteadier this week: 100% of tests passedHigher in this week's ranking: #43
claude-opus-5.5
By Anthropic
claude-sonnet-5.5
By AnthropicNew this week
Where they differ
claude-opus-5.5claude-sonnet-5.5
On this site
100%21 callsAvailability, last 3 days—
97%43 testsAvailability, this week's tests100%3 tests
1.8sAverage response this week1.5s
$0.044Price per reply$0.0037
#47Place in this week's ranking#43
$98.33Price per million characters$50.00
The model itself
22 Sep 2026Released28 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-opus-5.5 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 Models are served by third-party providers and may slow down or be withdrawn; this page follows those changes.