Nebius

Overview

Nebius is an OpenAI-compatible provider offering comprehensive API support through DeepIntShield. Key features:

• Full OpenAI compatibility - Chat, text completion, embeddings, and responses
• Streaming support - Server-Sent Events with delta-based updates
• AI Project ID - Nebius-specific project identifier support
• Tool calling - Complete function definition and execution
• Parameter filtering - Removes unsupported OpenAI-specific fields

Supported Operations

Operation	Non-Streaming	Streaming	Endpoint
Chat Completions	✅	✅	/v1/chat/completions
Responses API	✅	✅	/v1/chat/completions
Text Completions	✅	✅	/v1/completions
Embeddings	✅	-	/v1/embeddings
Image Generation	✅	-	/v1/images/generations
List Models	✅	-	/v1/models
Speech (TTS)	❌	❌	-
Transcriptions (STT)	❌	❌	-
Files	❌	❌	-
Batch	❌	❌	-

Note

Unsupported Operations (❌): Speech, Transcriptions, Files, and Batch are not supported by the upstream Nebius API. These return an unsupported-operation error.

---

1. Chat Completions

Request Parameters

Nebius supports all standard OpenAI chat completion parameters. For full parameter reference and behavior, see OpenAI Chat Completions.

Nebius-Specific Parameters

ai_project_id (Optional):

Nebius allows specifying a project ID for resource organization:

curl -X POST https://app.deepintshield.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "x-bf-vk: $DEEPINTSHIELD_VIRTUAL_KEY" \
  -d '{
    "model": "nebius/model-name",
    "messages": [...],
    "ai_project_id": "project-123"
  }'

Unsupported Parameters

The following parameters are not supported by Nebius and are ignored: prompt_cache_key, verbosity, store, service_tier.

Nebius supports all standard OpenAI message types, tools, responses, and streaming formats. For details on message handling, tools, responses, and streaming, refer to OpenAI Chat Completions.

---

2. Responses API

Nebius supports the Responses API with the same parameter support and message handling as Chat Completions, including ai_project_id via extra_params.

---

3. Text Completions

Nebius supports legacy text completion format:

Parameter	Mapping
prompt	Direct pass-through
max_tokens	max_tokens
temperature, top_p	Direct pass-through
stop	Stop sequences
frequency_penalty, presence_penalty	Penalty parameters

---

4. Embeddings

Nebius supports text embeddings:

Parameter	Notes
input	Text or array of texts
model	Embedding model name
encoding_format	”float” or “base64”
dimensions	Custom output dimensions (optional)

Response returns embedding vectors with usage information.

---

5. Image Generation

Request Parameters

Parameter	Type	Required	Notes
model	string	✅	Model identifier
prompt	string	✅	Text description of the image to generate
size	string	❌	Image size in WxH format (e.g., "1024x1024")
output_format	string	❌	Output format: "png", "jpeg", "webp"
response_format	string	❌	Response format: "url" or "b64_json"
seed	int	❌	Seed for reproducible generation
negative_prompt	string	❌	Negative prompt
num_inference_steps	int	❌	Number of inference steps
extra_params	object	❌	Nebius-specific parameters (see below)

Extra Parameters (via extra_params)

Parameter	Type	Notes
guidance_scale	int	Guidance scale (0-100)
ai_project_id	string	Nebius project ID

Response Behavior

Each returned image includes url, b64_json, revised_prompt, and a sequential index (0, 1, 2, …).

Endpoint: /v1/images/generations

Streaming: Image generation streaming is not supported by Nebius.

---

6. List Models

Lists available Nebius models with capabilities and context lengths.

---

Unsupported Features

Feature	Reason
Speech/TTS	Not offered by Nebius API
Transcription/STT	Not offered by Nebius API
Batch Operations	Not offered by Nebius API
File Management	Not offered by Nebius API

---

Caveats

Cache Control Stripped

Severity: Medium Behavior: Cache control directives are removed from messages Impact: Prompt caching features don’t work

Parameter Filtering

Severity: Low Behavior: OpenAI-specific fields filtered out Impact: prompt_cache_key, verbosity, store removed

User Field Size Limit

Severity: Low Behavior: User field > 64 characters silently dropped Impact: Longer user identifiers are lost