feat(responses): add output_text delta events to responses (#2265)

This adds initial streaming support to the Responses API. 

This PR makes sure that the _first_ inference call made to chat
completions streams out.

There's more to be done:
 - tool call output tokens need to stream out when possible
- we need to loop through multiple rounds of inference and they all need
to stream out.

## Test Plan

Added a test. Executed as:

```
FIREWORKS_API_KEY=... \
  pytest -s -v 'tests/verifications/openai_api/test_responses.py' \
  --provider=stack:fireworks --model meta-llama/Llama-4-Scout-17B-16E-Instruct
```

Then, started a llama stack fireworks distro and tested against it like
this:

```
OPENAI_API_KEY=blah \
   pytest -s -v 'tests/verifications/openai_api/test_responses.py' \
   --base-url http://localhost:8321/v1/openai/v1 \
  --model meta-llama/Llama-4-Scout-17B-16E-Instruct 
```
This commit is contained in:
Ashwin Bharambe 2025-05-27 13:07:14 -07:00 committed by GitHub
parent 6ee319ae08
commit 5cdb29758a
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8 changed files with 493 additions and 160 deletions

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@ -5294,11 +5294,13 @@ components:
OpenAIResponseObjectStream:
oneOf:
- $ref: '#/components/schemas/OpenAIResponseObjectStreamResponseCreated'
- $ref: '#/components/schemas/OpenAIResponseObjectStreamResponseOutputTextDelta'
- $ref: '#/components/schemas/OpenAIResponseObjectStreamResponseCompleted'
discriminator:
propertyName: type
mapping:
response.created: '#/components/schemas/OpenAIResponseObjectStreamResponseCreated'
response.output_text.delta: '#/components/schemas/OpenAIResponseObjectStreamResponseOutputTextDelta'
response.completed: '#/components/schemas/OpenAIResponseObjectStreamResponseCompleted'
"OpenAIResponseObjectStreamResponseCompleted":
type: object
@ -5330,6 +5332,33 @@ components:
- type
title: >-
OpenAIResponseObjectStreamResponseCreated
"OpenAIResponseObjectStreamResponseOutputTextDelta":
type: object
properties:
content_index:
type: integer
delta:
type: string
item_id:
type: string
output_index:
type: integer
sequence_number:
type: integer
type:
type: string
const: response.output_text.delta
default: response.output_text.delta
additionalProperties: false
required:
- content_index
- delta
- item_id
- output_index
- sequence_number
- type
title: >-
OpenAIResponseObjectStreamResponseOutputTextDelta
CreateUploadSessionRequest:
type: object
properties: