Claude Sonnet 4vsGPT OSS 120B
GPT OSS 120B is cheaper than Claude Sonnet 4 at $0.18/M vs $3/M input tokens.
| Spec | Claude Sonnet 4 | GPT OSS 120B |
|---|---|---|
| Input price | $3/M tokens | $0.18/M tokens |
| Output price | $15/M tokens | $0.8/M tokens |
| Context window | 200K tokens | 131K tokens |
| Parameters | Not disclosed | 117B (5.1B active) |
| Weights | Closed | Open |
| Free API (OpenRouter) | No | No |
| Released | May 2025 | Aug 2025 |
Our Verdict
GPT OSS 120B
Claude Sonnet 4Runner-up
Not enough votes to call it. On the specs, GPT OSS 120B has the edge: bigger model tier, newer.
Pick Claude Sonnet 4 for Image Generation. Pick GPT OSS 120B for Reasoning. GPT OSS 120B costs 19x less per token.
Too close to call
Reviewing agent-written code?See a Brief PR report
API pricing
Cost per 1M tokens
Claude Sonnet 4
Input
$3.00
Output
$15.00
GPT OSS 120B
Input
$0.18
17× cheaper
Output
$0.80
19× cheaper
GPT OSS 120B is cheaper on both: 17× input, 19× output.
Where to run it
21 hosts, cheapest first
Claude Sonnet 42 hosts
GPT OSS 120B19 hosts
AkashMLbf16$0.03 in$0.17 out131k100% upCoreWeavefp4$0.03 in$0.17 out131k100% upDekaLLMbf16$0.03 in$0.18 out131k99.2% upDeepInfrabf16$0.04 in$0.17 out131k99.9% upNovitafp4$0.05 in$0.25 out131k95.7% upDigitalOcean$0.06 in$0.39 out128k100% up
13 more hostsFewer hosts
Mancerfp8$0.06 in$0.50 out131k98.7% upGoogle Vertex AI$0.09 in$0.36 out131k99.9% upBasetenfp4$0.10 in$0.50 out128k100% upParasailfp4$0.10 in$0.75 out131k100% upSambaNova$0.14 in$0.95 out131k98.9% upAmazon Bedrock$0.15 in$0.60 out131k100% upGroq$0.15 in$0.60 out131k100% upNebiusfp4$0.15 in$0.60 out131k99.8% upPhala$0.15 in$0.60 out131k96.1% upSiliconFlowfp8$0.15 in$0.60 out131k96.1% upTogether$0.15 in$0.60 out131k97.7% upCerebrasfp16$0.35 in$0.75 out131k100% upMaradegraded$0.15 in$0.75 out131k77.9% up
Per million tokens. Prices and uptime via OpenRouter, checked 12 Sep 2026.
Writing DNA
Style Comparison
Similarity
34%
Claude Sonnet 4 uses 4.6x more emoji
Claude Sonnet 4
GPT OSS 120B
64%Vocabulary52%
81wSentence Length19w
0.56Hedging0.28
4.5Bold7.4
6.6Lists1.8
0.70Emoji0.15
1.59Headings0.73
0.20Transitions0.17
Based on 28 + 21 text responses
Research
What we learned reading every model
FAQ
Common questions
Keep exploring
More comparisons
GPT OSS 120B vs Ox AlphaNew provider
GPT OSS 120B vs MiniMax M3New provider
GPT OSS 120B vs MiniMax M1New provider
GPT OSS 120B vs Claude Opus 4Cross-provider
Claude Sonnet 4 vs GLM 4.7New provider
Claude Sonnet 4 vs GLM 4.7 FlashNew provider
Claude Sonnet 4 vs GLM 5New provider
Claude Sonnet 4 vs GLM 5 TurboNew provider