claude-fable-5.1 vs gpt-oss-20b
Both can be used on onomeo. Everything below comes from calls made through this site.
- claude-fable-5.1
- 2 advantages
- gpt-oss-20b
- 3 advantages
How to choose
claude-fable-5.1Longer context: 1M tokensReads images
gpt-oss-20bFaster: 0.9s on averageHigher in this week's ranking: #10Open weights
claude-fable-5.1
By AnthropicNew this week
gpt-oss-20b
By OpenAI
Where they differ
claude-fable-5.1gpt-oss-20b
On this site
—Availability, last 3 days99%102 calls
100%3 testsAvailability, this week's tests98%189 tests
3.4sAverage response this week0.9s
$0.018Price per replyFree
#48Place in this week's ranking#10
$216.67Price per million charactersFree
The model itself
1M tokensContext length128K tokens
128K tokensLongest reply32K tokens
YesReads imagesNo
Jun 2026Knowledge cutoffJun 2024
1 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-fable-5.1 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 Models are served by third-party providers and may slow down or be withdrawn; this page follows those changes.