---
# @generated by sylphx-gen 0.1.0 from contracts@e41a0a82ce4e85b77240402222da97d27f00a4498e6532efca0b4e93288879eb. Do not edit.
title: "Generations"
description: "The `generations` collection of Sylphx Observability: A Generation is one Sylphx AI inference call of a project environment (Responses, Messages, Chat Completions, embeddings, images, audio), read from the OpenTelemetry GenAI span the AI…"
type: reference
product: monitoring
summary: "A Generation is one Sylphx AI inference call of a project environment (Responses, Messages, Chat Completions, embeddings, images, audio),…"
updated: 2026-09-28
order: 900
---

A Generation is one Sylphx AI inference call of a project environment (Responses, Messages, Chat Completions, embeddings, images, audio), read from the OpenTelemetry GenAI span the AI gateway emits for it. It is a view over the environment's traces, so it has no store of its own and expires with them. It never names how the call was served: no route, account or vendor endpoint, and no cost other than the price the caller was charged. Prompts and outputs are not here. The id is the span id.

**Service** Sylphx Observability · **Resource type** `observability.sylphx.com/Generation` · **Name pattern** `orgs/{org}/projects/{project}/envs/{env}/generations/{generation}` · **Shape** `record`

## Fields

| Field | Type | What it is |
| --- | --- | --- |
| `name` | `string` | `orgs/{org}/projects/{project}/envs/{env}/generations/{generation}`. |
| `uid` | `string` | `gen_<cell><ulid>`; never reused. Output only. |
| `meta` | `ResourceMeta` | Resource metadata. |
| `trace_id` | `string` | The W3C trace id (32 hex); the caller's own when it sent `traceparent`. Output only. |
| `span_id` | `string` | The W3C span id (16 hex) of the gateway's span. Output only. |
| `operation` | `string` | `gen_ai.operation.name`, for example `chat`, `embeddings` or `generate_content`. Output only. |
| `api_surface` | `string` | The wire the call used: `responses`, `messages`, `chat_completions`, `embeddings`, `images`, `audio` or `realtime_transcription`. Output only. |
| `request_model` | `string` | The catalogue model id the caller named, for example `anthropic/claude-sonnet-5.5`. Output only. |
| `response_model` | `string` | The catalogue model id that answered. Output only. |
| `response_id` | `string` | The response id (`resp_...`, `msg_...` or `chatcmpl-...`). Output only. |
| `api_key` | `string` | The key that made the call, as a resource name. Output only. |
| `outcome` | `GenerationOutcome` | How the call ended. Output only. One of `succeeded`, `failed`, `cancelled`. |
| `finish_reasons` | `string[]` | `gen_ai.response.finish_reasons`, for example `stop` or `length`. Output only. |
| `error_type` | `string` | `error.type` when the call failed: the public error code, for example `rate_limited`. Output only. |
| `input_tokens` | `int64` | Input tokens, cached ones included. Output only. |
| `output_tokens` | `int64` | Output tokens, reasoning ones included. Output only. |
| `cache_read_input_tokens` | `int64` | Input tokens read from the prompt cache. Output only. |
| `cache_write_input_tokens` | `int64` | Input tokens written to the prompt cache. Output only. |
| `reasoning_output_tokens` | `int64` | Output tokens spent on reasoning. Output only. |
| `price_usd` | `string` | What the call was charged in USD, as a decimal string, for example `0.000420`; the same value as the response's `usage.sylphx.price`. Output only. |
| `start_time` | `timestamp` | When the gateway received the call. Output only. |
| `end_time` | `timestamp` | When the last byte of the answer was sent. Output only. |
| `time_to_first_chunk` | `duration` | From receipt to the first output chunk; unset when nothing streamed. Output only. |
| `streamed` | `bool` | Whether the answer was streamed. Output only. |
| `data_policy` | `string` | The data policy the call ran under: `standard`, `zdr` or `training`. Output only. |
| `tags` | `map<string, string>` | The caller's tags (`Sylphx-Tags` and the request's `metadata`), at most 64; filter as `tags.<key> = "value"`. Output only. |
| `end_user` | `string` | The caller's own end-user id (`user` or `safety_identifier`), as sent. Output only. |

## Methods

Every method of the collection, in the registry's order, with the scope it
needs. The full request, response and examples are one link away.

| Method | Call | What it does |
| --- | --- | --- |
| `GET` | [`get`](/docs/api/generations#get) | Gets a generation: one Sylphx AI call. |
| `GET` | [`list`](/docs/api/generations#list) | Lists the environment's Sylphx AI calls, newest first, within the trace retention; filter by `request_model`, `outcome`, `api_key`, `start_time`, `tags.<key>` and the other filterable fields. |

## get

Gets a generation: one Sylphx AI call.

`GET https://api.sylphx.com/v1/orgs/acme/projects/shop/envs/production/generations/generation` · scope `observability:read` · effect `read` · [Request, response and examples](/docs/api/generations/get)

## list

Lists the environment's Sylphx AI calls, newest first, within the trace retention; filter by `request_model`, `outcome`, `api_key`, `start_time`, `tags.<key>` and the other filterable fields.

`GET https://api.sylphx.com/v1/orgs/acme/projects/shop/envs/production/generations` · scope `observability:read` · effect `read` · paginated · [Request, response and examples](/docs/api/generations/list)