Claude 3.5 Sonnet vs gpt-oss-120b
Anthropic Claude 3.5 Sonnet | OpenAI gpt-oss-120b | |
|---|---|---|
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Jun 20 2024 | Aug 5 2025 |
| Access | Proprietary | Open Weight |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 45%Best | 11% |
Coding SWE-Bench VerifiedReal coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 33.4% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 59.4% | — |
| Timeline | ||
| Release gap | Claude 3.5 Sonnet shipped 411 days before gpt-oss-120b | |
Which is better: Claude 3.5 Sonnet or gpt-oss-120b?
Claude 3.5 Sonnet leads gpt-oss-120b on 1 of the 1 benchmark they both report (BullshitBench v2). Claude 3.5 Sonnet shipped 411 days before gpt-oss-120b, so benchmark comparisons should account for the intervening progress.
Claude 3.5 Sonnet is proprietary, while gpt-oss-120b is open weight.
On BullshitBench v2, Claude 3.5 Sonnet leads at 45% vs gpt-oss-120b at 11%.
Frequently asked questions
Claude 3.5 Sonnet was released by Anthropic on Jun 20 2024.
gpt-oss-120b was released by OpenAI on Aug 5 2025.
Claude 3.5 Sonnet is a proprietary model released by Anthropic. gpt-oss-120b is an open weight model released by OpenAI.
Other comparisons
Claude 3.5 Sonnet vs Gemini Omnigpt-oss-120b vs Gemini OmniClaude 3.5 Sonnet vs Muse Spark 1.1gpt-oss-120b vs Muse Spark 1.1Claude 3.5 Sonnet vs Grok 4.5gpt-oss-120b vs Grok 4.5Claude 3.5 Sonnet vs DeepSeek-V4-Progpt-oss-120b vs DeepSeek-V4-ProClaude 3.5 Sonnet vs Mistral Medium 3.5gpt-oss-120b vs Mistral Medium 3.5Claude 3.5 Sonnet vs Kimi K2.7 Codegpt-oss-120b vs Kimi K2.7 Code