Claude Opus 4.5vsGPT OSS 120B
Claude Opus 4.5 is the newer model, released after GPT OSS 120B.
| Spec | Claude Opus 4.5 | GPT OSS 120B |
|---|---|---|
| Input price | — | $0.18/M tokens |
| Output price | — | $0.8/M tokens |
| Context window | — | 131K tokens |
| Weights | Closed | Open |
| Free API (OpenRouter) | No | No |
| Released | Nov 2025 | Aug 2025 |
Our Verdict
Claude Opus 4.5
GPT OSS 120B
Not enough votes to call it. On the specs, nothing separates them.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 4.5
Input
—
Output
—
GPT OSS 120B
Input
$0.18
Output
$0.80
Where to run it
22 hosts, cheapest first
GPT OSS 120B18 hosts
AkashMLbf16$0.03 in$0.17 out131k99.9% upCoreWeavefp4$0.03 in$0.17 out131k99.9% upDeepInfrabf16$0.04 in$0.17 out131k99.1% upDigitalOcean$0.06 in$0.39 out128k100% upMancerfp8$0.06 in$0.50 out131k98% upGoogle Vertex AI$0.09 in$0.36 out131k99.9% up
12 more hostsFewer hosts
Basetenfp4$0.10 in$0.50 out128k100% upParasailfp4$0.10 in$0.75 out131k100% upAmazon Bedrock$0.15 in$0.60 out131k100% upGroq$0.15 in$0.60 out131k100% upNebiusfp4$0.15 in$0.60 out131k98.1% upTogether$0.15 in$0.60 out131k67.6% upCerebrasfp16$0.35 in$0.75 out131k100% upNovitafp4degraded$0.05 in$0.25 out131k73.2% upSiliconFlowfp8degraded$0.05 in$0.45 out131k69% upSambaNovadegraded$0.14 in$0.95 out131k93.7% upPhaladegraded$0.15 in$0.60 out131k73.5% upMaradegraded$0.15 in$0.75 out131k86.4% up
Per million tokens. Prices and uptime via OpenRouter, checked 8 Sep 2026.
Writing DNA
Style Comparison
Similarity
48%
GPT OSS 120B uses 3.6x more transitions
Claude Opus 4.5
GPT OSS 120B
66%Vocabulary52%
51wSentence Length19w
0.82Hedging0.28
6.0Bold7.4
4.5Lists1.8
0.18Emoji0.15
1.46Headings0.73
0.05Transitions0.17
Based on 27 + 21 text responses
Research
What we learned reading every model
FAQ
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