docs: add Nadir provider page

[doramirdor]

Adds a provider page for Nadir, the provider added to litellm in BerriAI/litellm#33227.

Disclosure: I work on Nadir.

Why this is needed

tests/documentation_tests/test_env_keys.py in the main repo fails on that PR:

Exception: Environment variables read under ./litellm but mentioned nowhere in the docs: ['NADIR_API_BASE', 'NADIR_API_KEY']

Since the docs moved to this repo, the code-quality and documentation jobs there clone BerriAI/litellm-docs@main, so that check cannot pass until a page here documents those two variables. provider_endpoints_support.json in the main repo also already links to /docs/providers/nadir, which is currently a dead link.

What the page says

The page documents what the provider actually enforces, not the full OpenAI surface:

• One virtual model, nadir/auto; the concrete model is chosen server-side per request.
• /chat/completions only, matching the provider_endpoints_support.json entry.
• Only the 7 body params the endpoint honors, since Nadir validates into its own request schema and silently drops anything outside it. extra_headers and max_retries are noted as transport-side.
• An explicit callout that tools / tool_choice / functions are not supported.
• Cost tracking via _hidden_params['additional_headers']['llm_provider-x-litellm-response-cost'], the same mechanism and doc phrasing the OpenRouter page uses, because the routed model is a vendor name with no nadir/* pricing entry.

Verification

• npm run build passes. The page produces no warnings; the 5 broken-anchor warnings are pre-existing on release_notes/* pages and unrelated.
• With this branch checked out into docs/my-website, all four documentation tests in the main repo pass, including the one currently failing: Every environment variable read under ./litellm is documented.
• sidebars.js entry added alongside the other providers.

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Project	Deployment	Actions	Updated (UTC)
litellm	Ready	Preview	Aug 11, 2026 8:42am