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POST
Create Message

Authorizations

Authorization
string
header
required

Enter your MeshAPI key (rsk_...) — sent as Authorization: Bearer <key>.

Headers

x-api-key
string | null
X-Mesh-Version
enum<string>
default:2026-08

Dated version of the API contract to pin this request to. Omit it and the request is served under 2026-08 — the oldest supported version, so an existing integration is never moved by a release. A malformed or unsupported value is rejected with 400 invalid_api_version rather than falling back silently. The version actually served is echoed as X-Mesh-Version on every response, including errors.

Available options:
2026-08

Body

application/json
model
string
required
max_tokens
integer
required
Required range: x >= 1
messages
AnthropicMessage · object[]
required
system
temperature
number | null
Required range: 0 <= x <= 1
top_p
number | null
Required range: 0 <= x <= 1
stop_sequences
string[] | null
stream
boolean
default:false
metadata
Metadata · object | null
tools
AnthropicTool · object[] | null
tool_choice
Tool Choice · object | null
top_k
integer | null
thinking
Thinking · object | null

Response

Successful Response