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Models › Text models

GPT-OSS 120B

OpenAI’s open-weight flagship — strong + open

OpenAI · text model

OpenAImaker
Standardin the default router pool
Copy + scriptshooks, captions, briefs, storyboards

GPT-OSS 120B is one of 25 text models Hermoso can write ad copy, hooks and scripts with. Name it, or leave the model out and the router picks a sound default. The same catalog is available from the app, the MCP server and the CLI, on one account and one credit balance; the exact price of every render is shown in the app before it runs.

What people make with it

  • Hooks, headlines and captions
  • UGC scripts and voiceover lines
  • Creative briefs and storyboards
  • The agent loop that plans a whole ad

About OpenAI

OpenAI makes the GPT Image line, the strongest models at rendering legible text inside an image, and the GPT text models.

Specs

Best forOpenAI’s open-weight flagship — strong + open
TierStandard
Model idgpt-oss-120b

GPT-OSS 120B compared with other text models

ModelMakerTierBest for
GPT-OSS 120BOpenAIStandardOpenAI’s open-weight flagship — strong + open
Claude Fable 5.1AnthropicPremiumMost capable — deepest creative + reasoning
Claude Fable 5AnthropicPremiumPrevious Fable
Claude Opus 5AnthropicPremiumNewest — deepest analysis
Claude Opus 4.8AnthropicPremiumBest for complex, analytical work
Claude Opus 4.6AnthropicPremiumBest for long-form creative work
Claude Sonnet 5AnthropicStandardResponsive everyday work

See all 25 text models side by side.

Just ask for it

In Claude, ChatGPT, Cursor or any assistant connected to Hermoso, name the model in plain English. Or pick it from the model menu in the app.

Write five TikTok hooks for our olive oil with GPT-OSS 120B.
Use GPT-OSS 120B to script a 15 second testimonial, then render it.
Have GPT-OSS 120B rewrite this caption for LinkedIn, Instagram and X.

Getting the best out of GPT-OSS 120B

  • Give the platform, the length and the count: five nine-word TikTok hooks.
  • Paste the product page or a real review. Specifics beat adjectives.
  • Ask for variants on one angle at a time (price, speed, proof) so each can be tested cleanly.
  • List the words you never want to see. A blocklist is respected.

Write ad copy with GPT-OSS 120B. Start free, and every feature is on every plan.

Start free →   See pricing

Frequently asked questions

What is GPT-OSS 120B used for in Hermoso?

OpenAI’s open-weight flagship — strong + open. It writes hooks, captions, scripts and briefs, and can drive the agent loop that plans a whole ad.

Is GPT-OSS 120B the default?

It is in the default pool. Name it to force it, or leave the model out and the router chooses.