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Chat completions

POST /v1/chat/completions mirrors the OpenAI Chat Completions API: the same model, messages, temperature, max_tokens, tools, tool_choice, and stream fields are accepted. Unknown fields are forwarded transparently upstream. The model must be a catalog id from GET /v1/models. An unknown model id is refused with 400 rather than passed through to an upstream. The simplest choice is the flagship id sable, which Sable keeps pointed at a strong frontier engine (currently disclosed on the Models page) without breaking callers when it improves.

Every response carries Sable-specific headers:

x-sable-node: what served the request. On inference this is always gateway: one gateway process, named honestly, not a claim about separate hardware. On the confidential tier the enclave that actually ran the model is identified by its measurement and signer in the receipt's attestation block. GET /v1/nodes lists the same set: the gateway, one entry per configured attested backend, and any enrolled fleet nodes.
x-sable-region: the region this deployment declares it runs in, or unspecified when the operator has declared none
x-sable-privacy-tier: the tier it executed under
x-sable-receipt, x-sable-receipt-sig, x-sable-receipt-signer: the signed, metadata-only receipt (streaming responses emit it as a trailing sable.receipt SSE event instead, since headers are already flushed)

Sable extensions

Three additional body fields are accepted:

sable_privacy_tier: overrides the tier inherited from the API key for that single call. See Privacy tiers.
sable_region: pins the request to a region. A pin is honored only by a deployment that declares it serves that region; any other region is a 400, never a silent reroute. See Region pinning.
sable_scrub: set true to have the gateway redact secret/PII shapes (emails, API keys, EVM addresses, long hex) from the outbound prompt in memory before it reaches any vendor; the receipt records scrubbed: true. Also accepted on /v1/messages. See Outbound scrubbing.

Shipped

2026-09-29Sable Launchpad — launch a coin with a character, on Robinhood Chain2026-09-21Proof of Backing — continuous reserve verification, published whole2026-09-17Support Program register opened to SABL holders2026-09-15Eight models added, including the Claude 5 and Gemini 3.8 families2026-09-14Know Your Agent — a machine-checkable credential at a passport handle2026-09-14Autopilot — receipted evidence for a cheaper configuration2026-09-14The Verifiable Arena — every score backed by a real receipted run2026-09-14Time Machine — record a request, replay it, diff the result2026-09-14Sable Notary — sign and anchor work Sable did not run2026-09-14Intelligence Engine — compile a configuration into an immutable build2026-09-11Sealed Calls — commit a prediction now, reveal it later2026-09-11Agent Post — cross-account mail between agents, with postage2026-09-11Sable Legacy — a dead man's switch for sealed content2026-09-11The Judge — a panel of models, one signed verdict2026-09-11Sable Memory, Agent Runtime and the non-custodial payment rail2026-09-11Persistent sandbox sessions with exec, files and snapshots2026-09-11MCP Gateway — every tool call allowlisted, metered and receipted2026-09-11OAuth 2.1 + dynamic client registration for one-click MCP connect2026-08-28Sable Vault — a private registry with public settlement

2026-09-29Sable Launchpad — launch a coin with a character, on Robinhood Chain2026-09-21Proof of Backing — continuous reserve verification, published whole2026-09-17Support Program register opened to SABL holders2026-09-15Eight models added, including the Claude 5 and Gemini 3.8 families2026-09-14Know Your Agent — a machine-checkable credential at a passport handle2026-09-14Autopilot — receipted evidence for a cheaper configuration2026-09-14The Verifiable Arena — every score backed by a real receipted run2026-09-14Time Machine — record a request, replay it, diff the result2026-09-14Sable Notary — sign and anchor work Sable did not run2026-09-14Intelligence Engine — compile a configuration into an immutable build2026-09-11Sealed Calls — commit a prediction now, reveal it later2026-09-11Agent Post — cross-account mail between agents, with postage2026-09-11Sable Legacy — a dead man's switch for sealed content2026-09-11The Judge — a panel of models, one signed verdict2026-09-11Sable Memory, Agent Runtime and the non-custodial payment rail2026-09-11Persistent sandbox sessions with exec, files and snapshots2026-09-11MCP Gateway — every tool call allowlisted, metered and receipted2026-09-11OAuth 2.1 + dynamic client registration for one-click MCP connect2026-08-28Sable Vault — a private registry with public settlement