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Why am I getting 401?

The key is missing, mistyped, revoked, or not sent as Authorization: Bearer <key>. API keys start with z_sk_.

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Why am I getting 400 about the model?

The model ID is not in the catalog, or you asked for a level the model does not offer. Pull an exact ID from GET /v1/models. The suffixes are :confidential and :encrypted; :encrypted also needs the Encrypted headers.

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Why am I getting 429 with insufficient_quota on a new key?

The organization has no funding. An API key needs a subscription or a prepaid balance. Add funds on Billing. See Plans.

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Why am I getting 429?

A rate limit or an exhausted allowance. rate_limited carries Retry-After and X-RateLimit-Limit, X-RateLimit-Remaining, and X-RateLimit-Reset headers. insufficient_quota means the allowance or balance is spent. See Rate limits.

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Is there a request size cap?

Chat requests 64 MiB, other inference routes 4 MiB, inline attachments 1 MiB decoded. Oversized requests are rejected before inference.

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Does streaming work at every privacy level?

Every level streams; Encrypted deltas arrive as ciphertext. See Streaming.

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What is not available yet?

Audio and video input, and the Files API.