claude-opus-5.5 vs gpt-oss-20b
Both run on onomeo with free credits. Everything below comes from calls made through this site.
- claude-opus-5.5
- 3 advantages
- gpt-oss-20b
- 5 advantages
How to choose
claude-opus-5.5Faster: 1.4s on averageLonger context: 1M tokensReads images
gpt-oss-20bCheaper: about 32 a reply, 100% lessSteadier: 96% up over 3 daysSteadier this week: 94% of tests passedHigher in this week's ranking: #24Open weights
claude-opus-5.5
By AnthropicNew this week
gpt-oss-20b
By OpenAI
Where they differ
claude-opus-5.5gpt-oss-20b
On this site
57%7 callsAvailability, last 3 days96%58 calls
66%9 testsAvailability, this week's tests94%69 tests
1.4sAverage response this week7.0s
6,732Credits per reply32
~29Replies a day's check-in buys~288
#47Place in this week's ranking#24
15×Credit multiplier1×
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. Replies a day assumes a full daily check-in and the daily call limit.
Compare next
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 Models are served by third-party providers and may slow down or be withdrawn; this page follows those changes.