claude-opus-5.5 vs gpt-oss-20b
Both can be used on onomeo. Everything below comes from calls made through this site.
- claude-opus-5.5
- 2 advantages
- gpt-oss-20b
- 3 advantages
How to choose
claude-opus-5.5Longer context: 1M tokensReads images
gpt-oss-20bFaster: 1.2s on averageHigher in this week's ranking: #4Open weights
claude-opus-5.5
By Anthropic
gpt-oss-20b
By OpenAI
Where they differ
claude-opus-5.5gpt-oss-20b
On this site
100%5 callsAvailability, last 3 days99%115 calls
100%37 testsAvailability, this week's tests98%204 tests
2.0sAverage response this week1.2s
$0.044Price per replyFree
#25Place in this week's ranking#4
$98.33Price per million charactersFree
The model itself
1M tokensContext length128K tokens
128K tokensLongest reply32K tokens
YesReads imagesNo
Jun 2026Knowledge cutoffJun 2024
22 Sep 2026Released5 Aug 2025
NoOpen weightsYes
Where they match
- Calls toolsYes
- Thinks before answeringYes
- Conversations used for trainingUsed to train and improve the provider’s models
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.
Compare next
claude-opus-5.5 against other models
gpt-oss-20b 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 Models are served by third-party providers and may slow down or be withdrawn; this page follows those changes.