feat: add nvidia/openai/gpt-oss-20b

[guillaumegay13]

✨ What changed

• Adds openai/gpt-oss-20b (nvidia) to the catalog, params cloned from nvidia/deepseek-v4-flash-0731.yaml.
• Hosted serving: the model is developed by openai (OpenRouter: openai/gpt-oss-20b); this entry documents nvidia's serving of it, probed against nvidia's endpoint.

💭 Why

The provider serves it but the catalog doesn't list it. Param surfaces differ per serving provider, so each host gets its own probed entry (models.dev-style).

📝 Notes

• Liveness ✅ only: the model answers on its real endpoint; unverified params are listed in the evidence table below.
• Draft PR, auto-proposed by the modelparams agent.

Param verification evidence

param	check	ok	detail
(baseline)	accepted	✅	1-shot answers 200
temperature	min=0	✅
temperature	max=1	✅
top_p	max=1	➖	network/timeout: AbortError
max_tokens	min=1	✅
max_tokens	max=16384	➖	too large for a non-streaming probe — upper bound from docs
max_tokens	range policed	❌	vendor reports max 131072, YAML says 16384
frequency_penalty	min=-2	✅
frequency_penalty	max=2	✅
frequency_penalty	range policed	✅	frequency_penalty=4 rejected
presence_penalty	min=-2	✅
presence_penalty	max=2	✅
presence_penalty	range policed	✅	presence_penalty=4 rejected
seed	min=0	✅
seed	max=18446744073709552000	❌	1 validation error: {'type': 'less_than_equal', 'loc': ('body', 'seed'), 'msg': 'Input should be less than or equal to 9223372036854775807', 'input': 1844674407
seed	range policed	✅	seed=36893488147419103000 rejected
stop	declared	➖	type string has no probe — value carried from sibling/docs, not verified

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Project	Deployment	Actions	Updated
modelparams.dev	Ready	Preview	Sep 2, 2026 8:28pm UTC