gpt-oss-120b vs claude-opus-5.5
Both run on onomeo with free credits. Everything below comes from calls made through this site.
- gpt-oss-120b
- 6 advantages
- claude-opus-5.5
- 2 advantages
How to choose
gpt-oss-120bCheaper: about 652 a reply, 90% lessSteadier: 100% up over 3 daysSteadier this week: 100% of tests passedHigher in this week's ranking: #2No training on conversationsOpen weights
claude-opus-5.5Longer context: 1M tokensReads images
gpt-oss-120b
By OpenAI
claude-opus-5.5
By AnthropicNew this week
Where they differ
gpt-oss-120bclaude-opus-5.5
On this site
100%66 callsAvailability, last 3 days57%7 calls
100%83 testsAvailability, this week's tests66%9 tests
1.3sAverage response this week1.4s
652Credits per reply6,732
~288Replies a day's check-in buys~29
#2Place in this week's ranking#47
1×Credit multiplier15×
The model itself
128K tokensContext length1M tokens
32K tokensLongest reply128K tokens
NoReads imagesYes
Not used for training.Conversations used for trainingUsed to train and improve the provider’s models.
Jun 2024Knowledge cutoffJun 2026
5 Aug 2025Released22 Sep 2026
YesOpen weightsNo
Where they match
- Calls toolsYes
- Thinks before answeringYes
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.
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gpt-oss-120b 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 Models are served by third-party providers and may slow down or be withdrawn; this page follows those changes.